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DOWNTOWN LINE 2 CONTRACT C918 Revision B Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation

Job No. S4922 Geoconsult Asia Singapore 01/08/2012

Table of Contents

0 REVISION RECORD ........................................................................................................................... 2

1 INTRODUCTION ................................................................................................................................. 3

2 ALIGNMENT AND GROUND CONDITIONS ..................................................................................... 4

2.1 Alignment ............................................................................................................................................ 4

2.2 Ground Conditions .............................................................................................................................. 4

3 CALCULATIONS ................................................................................................................................ 5

4 CONCLUSIONS & RECOMMENDATIONS ....................................................................................... 6

4.1 General ................................................................................................................................................ 6

4.2 TBM Operation .................................................................................................................................... 6

4.3 Recommendations .............................................................................................................................. 6

5 REFERENCES .................................................................................................................................... 8

APPENDIX: Appendix 1 Ground Information Appendix 2 Design Parameter and Input Data Appendix 3 Recommended Face Pressure Values Appendix 4 Cutter Head Intervention

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0 REVISION RECORD

Revision Description of Amendments Date

-

First Issue 20/06/2011

A

Final Submission 13/09/2011

B

Final Submission Revised According to LTAs Comments 01/08/2012

File: W:\wo0_job\49\22-C918-DD Alpine\TECH-DOC\Reports\Face Pressure\TKK to BTN\Rev. B\DOC-918-TUN-DCS-9101_B.doc

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1 INTRODUCTION

Contract 918 consists of design and construction of station at Tan Kah Kee, the twin bored tunnels from the cross over box northwest of Tan Kah Kee Station (TKK) to the station at Sixth Avenue (SAV) within C917, and another twin bored tunnels between the Tan Kah Kee station (TKK) and the station at Botanic Garden (BTN) to be constructed under the C919.

The Tunnel works include twin bored tunnel with inner diameter of 5.8m and outer diameter 6.35m as well as two mined cross passages. The total length of the twin bored tunnel is about 1.483 kilometres. The length of twin bored tunnel from Cut Cover Tunnel to Sixth Avenues Station is 0.558 kilometres and the length of twin bored tunnel from Tan Kah Kee Station to Botanic Garden Station (BTN) is 0.925 kilometres.

This report provides estimate of required face pressures to be applied and controlled during driving from TKK to BTN station only. The estimated TBM face pressure for bored tunnels between CCT and SAV station is covered by a separate report.

The twin bored tunnel will be constructed by slurry tunnel boring machines (slurry TBMs). The slurry TBM is designed to allow excavation in the varying soft ground conditions. Pre-cast concrete segmental lining, designed to provide the final permanent support, will be installed at the tail section of the TBM as it advances though the ground.

The report shall be read in conjunction with drawing and geotechnical data presented in Appendix 1 and Appendix 2.

The overall site plan of Contract C918 is presented in Figure 1-1 below.

Figure 1-1: Site Plan of Contract C918

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2 ALIGNMENT AND GROUND CONDITIONS

2.1 ALIGNMENT

As stated above, contract C918 bored tunnel alignment features twin bored tunnels.

At Launching area:

Expo Bound Track tunnel (Left tunnel from TKK to BTN) Bukit Panjang Bound Track tunnel (Right tunnel from TKK to BTN)

At Receiving area:

Expo Bound Track tunnel (Left tunnel from TKK to BTN) Bukit Panjang Bound Track tunnel (Right tunnel from TKK to BTN)

As mentioned in Section 1 above, the alignment of DTL 2 for C918 commences from the launching area which is located at the TKK station. After the launch, the TBMs will run more or less at the same level throughout the drive.

The length of the bored tunnels is about 0.925 kilometers for each drive. Both tunnels will be driven along decreasing chainages.

2.2 GROUND CONDITIONS

The ground conditions are interpreted based on GIBR attached in LTA consolidated working document documents Ref [1]. The project site is located primarily in Fill underlying by Kallang Formation and the bottom layers are comprised of Bukit Timah Granite.

The subsurface layering can be classified into the following layers:

Fill Estuarine Clay (E) Fluvial Clay (F2) Fluvial Sand (F1) Residual soil of Grade VI (GVI) and Grade V (GV) Various grades of Rock, i.e. Grade IV (GIV), Grade III (GIII), Grade II (GII)

and Grade I (GI)

For easy reference, the soil profile along the tunnel alignment is presented in Appendix 1.

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3 CALCULATIONS

The calculation approach investigates the stability of tunnel face by considering limit equilibrium of a sliding wedge at the face loaded by a prismatic body.

The imposed loads comprise of surface surcharge of 20 kPa and gravity loading of soil above the sliding wedge. Ground water table at 1m below the ground surface is considered in calculations. Both drained and undrained behaviours of relevant soil materials are examined. Generally, recommended face pressures are derived from the more conservative drained case.

A total of 38 sections for each TBM drive have been calculated. Selection of sections for calculations is based on variations of overburden, and geology at the tunnel face. The distance between the analysis sections is generally about 25m.

The calculation approach is based on Anagnostou and Kovari, Ref.[7]. This approach has previously been applied successfully to the TBM tunnel drives for other projects in Singapore including, the North East Line, the Deep Tunnel Sewerage System (DTSS), the Circle Line Stages 2, 3, 4 & 5 and the Downtown Line 1.

The following design considerations are mentioned in particular:

1. The ground conditions at tunnel level and above are taken from the geotechnical interpretive report and the geotechnical soil profile which is presented in Appendix 1.

2. TBM face pressures are derived by calculations based on the approach presented in Ref.[7], considering the local ground conditions as well as groundwater seepage forces at the face.

3. Seepage pressure and related temporary depressurisation at the excavation face were considered in the analyses using drained soil parameters. Since the TBM will be advancing at an average rate of about 10m per day, this is considered conservative.

The input parameters used in calculation are summarized in Appendix 2 and the results of calculations are summarised in Appendix 3.

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4 CONCLUSIONS & RECOMMENDATIONS

4.1 GENERAL

Based on existing ground conditions at tunnel level, the required face pressures are calculated and presented in Appendix 3.

4.2 TBM OPERATION

The twin bored tunnels will be driven using two slurry TBM for each drive. The TBM is expected to be operated with the pressure chamber fully filled and pressurized, such that the recommended face pressure range as provided in Appendix 3 is maintained at all times.

The tables in Appendix 3 provide the following information:

Recommended face pressure range at tunnel axis level Recommended tail void grouting pressure range Recommended compressed air pressure during cutterhead interventions

Hydrostatic groundwater pressure at tunnel axis level

4.3 RECOMMENDATIONS

The recommended face pressure ranges are proposed in Appendix 3.

The proposed values are based on the understanding that during TBM driving, the following strategy will be adopted in principle:

In general, the applied face pressure shall be within the recommended face pressure range at all times

Shop Houses: From the findings of the CIAR, Ref. [9], the tunnel excavation needs to limit the volume loss to 1.0% in the zone of the Shop Houses. The conclusion from that assessment is that the volume loss of 1.0% needs to be applied for Bukit Panjang bound tunnel only between chainage 46+020 and 45+950. According to Report Ref. [8], Figure 4-4 the recommended minimum face pressure is 220 kPa as indicated on the graph in Appendix 3.

DTSS: The TBMs will be operated at target face pressures, which are typically in the range of the local hydrostatic groundwater pressure. In this kind of operation scenario, drastic pressure gradients between the TBMs excavation chamber and the outside water pressure are avoided.

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Cluny Court: From the findings of the CIAR, Ref. [9], the tunnel excavation needs to limit the volume loss to 0.5% in the zone of Cluny Court building. The conclusion from that assessment is that the volume loss of 0.5% needs to be applied for both tunnel drives of Bukit Panjang and Expo bounds between chainage 46+020 and 45+950. According to Report Ref. [8], Figure 4-1, the recommended minimum face pressure is 300 kPa as indicated on the graphs in Appendix 3.

CCL Tunnels: Ref. [8] includes the volume loss assessment for the above CCL tunnels (refer to Figure 4-2). Within this zone, TBM face pressures in the range of 300kPa is required in order to maintain the volume loss of 0.5% or below, which is the maximum volume loss for this area in accordance with the project specifications, Ref. [3]. During the approach of the C918 TBMs towards the CCL crossing area, the volume loss shall be verified in monitoring sections. The recommended minimum face pressure at the monitoring sections are indicated on the graphs in Appendix 3.

Settlements and muck volume balance shall be continuously determined to provide the main criteria to judge the adequacy of applied face pressures.

For cutterhead intervention (refer to Appendix 4), it is recommended to initially apply at least the stated air pressure. However, after visual inspection and verification, the air pressure may be reduced in stages. If no are adverse soil behavior is visible at the face and the stability of excavation face is ensured, the intervention may be even be carried out in atmospheric conditions (free air).

The actual face pressures applied during driving and air pressures during cutterhead interventions shall be reviewed by the TBM operation team, QP(D), QP(S) and LTA project team on a regular basis. If necessary, the recommended pressure values presented in this report shall be updated.

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5 REFERENCES

For the preparation of this document the following data sources were used:

[1] LTA; Working documents; Geotechnical Interpretative Baseline Report (GIBR) for C918

[2] Land Transport Authority, Consolidated Working Documents for Contract C918, General Specification.

[3] Land Transport Authority, Consolidated Working Documents for Contract C918, Particular Specification.

[4] Land Transport Authority, Civil Design Criteria.

[5] Land Transport Authority, Consolidated Working documents for Contract C918, Factual Geotechnical Report.

[6] SIL, Additional Soil Investigation Works for C918 Tunnel Section, Borelogs

[7] G. Anagostou, K. Kovari: Face Stability in Slurry and EPB Shield Tunnelling; Tunnels & Tunnelling; December 1996

[8] Contractors Design Consultant, Volume Loss Assessment, Document No.: DOC/918/TUN/DCS/9040

[9] Contractors Design Consultant, Impact Assessment for Bored Tunnel, Document No.: DOC/918/TUN/DCS/9060

[10] Contractors Design Consultant, Interfacing of C918 Bored Tunnels with existing CCL MRT Tunnels, Document No.: DOC/918/TUN/DCS/9062

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DOWNTOWN LINE 2 CONTRACT C918 Revision B Bored Tunnel between TKK and BTN - TBM Face Pressure Calculation Appendix


Appendix 1: Ground Information

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Appendix 2: Design Parameter and Input Data

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Geoconsult Asia Singapore Page 1

1 2 3 4 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

(mDMD) (mDMD) (m) (m) (m) (m) (m) (m) kN/m3 kN/m3 kN/m3 kN/m3 kN/m3 kN/m3 kN/m2

GWcond

Chainage Geotechnical Unit at Tunnel

Axis

Ground Level Top of RailLayer 1 Layer 2 Layer 3 Layer 4 Layer 5 Layer 6

Z1 Z2 Z3 Z4 Z5 Z6 1 2 3 4 5 6 Additionalsurcharge

Effective Lateral Earth Pressure

Coefficient

1 46+727.180 GIII 104.000 84.700 FILL E F2 GVI GIII GIII 2.40 3.80 1.80 3.90 2.70 3.17 18.7 15 18.5 18.5 23 23 0 0.302 46+700.000 GIII 104.000 83.900 FILL E F2 GVI GVI GIII 2.00 4.00 1.40 4.00 4.00 3.17 18.7 15 18.5 18.5 18.5 23 0 0.303 46+675.000 GVI 104.000 83.100 FILL E F1 GVI GVI GVI 3.31 4.20 3.30 2.70 2.70 3.17 18.7 15 19 18.5 18.5 18.5 0 0.504 46+650.000 N-3 104.000 82.400 FILL E F1 GVI GVI N-3 3.70 3.80 3.70 3.70 2.00 3.17 18.7 15 19 18.5 18.5 18.5 0 0.505 46+625.000 N-3 104.000 81.600 FILL E F1 F1 GVI N-3 2.30 4.11 3.35 3.35 4.60 3.17 18.7 15 19 19 18.5 18.5 0 0.506 46+600.000 N-3 104.000 80.900 FILL E F1 F1 GVI N-3 3.00 4.10 4.00 4.00 3.30 3.17 18.7 15 19 19 18.5 18.5 0 0.507 46+575.000 N-3 104.000 80.100 FILL E F2 F1 GVI N-3 2.80 3.30 2.11 8.00 3.00 3.17 18.7 15 18.5 19 18.5 18.5 0 0.508 46+550.000 GVI 104.000 79.500 FILL E F1 GVI GVI GVI 2.51 4.50 7.00 2.90 2.90 3.17 18.7 15 19 18.5 18.5 18.5 0 0.50

8a 46+541.000 GVI 104.000 79.500 FILL E F1 GVI GVI GVI 3.10 3.60 6.50 3.30 3.30 3.17 18.7 15 19 18.5 18.5 18.5 0 0.508b 46+535.000 GVI 101.400 79.500 FILL E F1 GVI GVI GVI 0.50 3.60 6.50 3.30 3.31 3.17 18.7 15 19 18.5 18.5 18.5 0 0.509 46+525.000 GVI 104.000 79.500 FILL E F1 GVI GVI GVI 3.10 3.60 6.50 3.30 3.30 3.17 18.7 15 19 18.5 18.5 18.5 0 0.50

10 46+500.000 GVI 104.000 77.900 FILL E F1 GVI GVI GVI 3.80 3.10 7.00 3.80 3.70 3.17 18.7 15 19 18.5 18.5 18.5 0 0.5011 46+475.000 GVI 104.000 77.100 FILL E F1 E GVI GVI 3.80 3.00 6.81 1.70 6.90 3.17 18.7 15 19 15 18.5 18.5 0 0.5012 46+450.000 GV50 104.000 76.400 FILL E F2 GVI GV50 GV50 3.00 4.10 6.00 7.00 2.80 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5013 46+425.000 GV50 104.000 75.700 FILL E F2 GVI GV50 GV50 2.70 4.90 4.70 7.70 3.60 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5014 46+400.000 GV50 104.000 74.800 FILL E F2 GVI GV50 GV50 3.11 4.20 6.20 8.00 3.00 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5015 46+375.000 GV70 104.000 74.100 FILL E F1 GVI GV50 GV70 4.00 5.00 4.80 9.00 2.41 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5016 46+350.000 GV90 104.000 73.400 FILL E F2 GVI GV90 GV90 4.00 6.00 2.20 9.50 4.20 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50

16a 46+341.200 GV120 104.000 72.600 FILL E F2 GVI GV120 GV120 4.30 3.40 4.40 7.61 7.00 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5016b 46+329.400 GV120 101.000 72.600 FILL E F2 GVI GV120 GV120 1.30 3.40 4.40 7.61 7.00 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5017 46+325.000 GV120 104.000 72.600 FILL E F2 GVI GV120 GV120 4.30 3.40 4.40 7.61 7.00 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5018 46+300.000 GV120 104.000 71.900 FILL E F2 GVI GV120 GV120 3.50 2.70 3.40 9.10 8.70 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5019 46+275.000 GV120 104.000 71.100 FILL E F2 GVI GV120 GV120 2.70 1.21 4.00 9.80 10.50 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5020 46+250.000 GIII 104.000 70.400 FILL F1 GVI GV70 GVI GIII 6.30 3.00 6.00 9.20 4.40 3.17 18.7 19 18.5 19.5 18.5 23 0 0.3021 46+225.000 GIII 104.500 70.300 FILL F1 GVI GV70 GVI GIII 6.20 3.00 6.10 9.10 5.11 3.17 18.7 19 18.5 19.5 18.5 23 0 0.3022 46+200.000 GIII 105.000 68.800 FILL F1 GVI GV70 GIII GIII 5.41 6.00 7.40 8.50 4.20 3.17 18.7 19 18.5 19.5 23 23 0 0.3023 46+175.000 GV150 104.500 68.300 FILL E F1 GVI GV150 GV150 3.00 3.00 6.20 11.60 7.71 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5024 46+150.000 GV150 104.000 68.100 FILL E F2 GVI GV150 GV150 2.00 4.00 4.81 5.00 15.40 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5025 46+125.000 GV120 104.000 68.100 FILL E F2 GVI GV70 GV120 2.51 4.00 4.00 7.40 13.30 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5026 46+100.000 GIV 104.000 68.140 FILL E F2 GVI GV120 GIV 2.21 6.50 13.00 4.95 4.51 3.17 18.7 15 18.5 18.5 19.5 23 0 0.3027 46+075.000 GIII 103.750 69.950 FILL GVI GV70 GIV GIII GIII 7.40 7.40 9.00 3.00 2.30 3.17 18.7 18.5 19.5 23 23 23 0 0.3028 46+050.000 GIII 103.500 69.800 FILL E GVI GV120 GIII GIII 3.00 6.51 6.30 9.70 3.50 3.17 18.7 15 18.5 19.5 23 23 0 0.3029 46+025.000 GV70 103.650 69.750 FILL E F2 GVI GV70 GV70 4.00 4.50 3.40 10.51 6.80 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5030 46+000.000 GV120 101.300 70.000 FILL E F2 GVI GV120 GV120 1.70 4.10 6.50 4.80 9.50 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5031 45+975.000 GV120 103.500 70.500 FILL E F2 GVI GV120 GV120 3.90 4.90 6.00 4.00 9.50 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5032 45+950.000 N-1 103.200 71.000 FILL E F1 GVI GV150 N-1 4.00 5.00 6.00 3.00 9.51 3.17 18.7 15 19 18.5 19.5 21.3 0 0.5033 45+925.000 GV150 105.100 71.500 FILL E F1 GVI GV70 GV150 5.30 4.60 6.50 3.90 8.60 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5034 45+900.000 GV150 106.000 72.200 FILL E F1 GVI GV70 GV150 6.90 3.30 9.80 2.90 6.20 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5035 45+875.000 GV70 106.300 72.650 FILL E F2 GVI GV70 GV70 7.00 5.60 7.35 6.30 2.70 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5036 45+850.000 GV70 105.600 73.300 FILL E F2 GVI GV70 GV70 6.50 5.20 6.40 7.10 2.40 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5037 45+825.000 GV70 106.250 73.800 FILL E F1 GVI GV GV70 5.55 5.80 4.80 6.40 5.20 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5038 45+809.880 GII 106.500 74.000 FILL E F2 GVI GII GII 5.40 5.70 4.30 6.00 6.40 3.17 18.7 15 18.5 18.5 24 24 0 0.30

CHI1 46+636.000 GV50 103.720 81.600 FILL E F1 F1 GVI GV50 2.50 3.80 4.50 4.50 2.13 3.17 18.7 15 19 19 18.5 19.5 0 0.50CHI2 46+430.000 GV70 103.900 75.700 FILL E F1 GVI GV70 GV70 2.71 4.70 5.00 7.60 3.50 3.17 18.7 15 19 18.5 19.5 19.5 0 0.50CHI3 46+341.200 GV90 104.000 73.400 FILL E F2 GVI GV90 GV90 4.00 6.00 2.20 9.50 4.20 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50CHI4 46+280.000 GV90 104.400 71.300 FILL E F1 GVI GV70 GV90 3.00 1.61 3.80 10.00 10.00 3.17 18.7 15 19 18.5 19.5 19.5 0 0.50CHI5 46+131.000 GV120 103.500 67.900 FILL E F2 GVI GV70 GV120 1.80 4.00 4.50 5.30 15.30 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50CHI6 46+020.000 GV120 103.750 69.700 FILL E F1 GVI GV120 GV120 3.70 4.45 5.60 7.00 8.60 3.17 18.7 15 19 18.5 19.5 19.5 0 0.50CHI7 45+870.000 GV90 105.500 72.600 FILL E F2 GVI GV90 GV90 6.90 4.80 7.61 5.30 3.60 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50

Bukit Panjang Bound

Cutterhead Intervention

Bulk WeightSoil Layers DepthSoil Layer Type

Geotechnical Design Parameters for Bukit Panjang Bound DTL MRT Project Bukit Panjang Bound - C918

MasterGTInfo-C918_Bukit Panjang MasterGTInfo-C918_Bukit Panjang

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Project - Contract C918 Bukit Panjang Bound(TKK To BTN)INPUT PARAMETERS - TUNNEL GEOMETRY AND GROUND PROPERTIES

Tunnel GeometryTBM diameter D [m] 6.60Cutterhead opening ratio cor [%] 60% (percent of area covered by cutting wheel)Relevant face diameter D rel [m] 4.17Length of TBM cutter head P [m] 0.89Length of screw conveyor Lscrew [m] naSurcharge q [kPa] 20.00Overall factor of safety FS tot [-] 1.20 (applied to driving forces in force equilibrium)

Air pressure FOS FS air [-] 1.00 (normally use 1.0 - especially in shallow ground order to avoid air blow-out)

Soil material, partial strength factor cu [-] 1.00 (applied to strength parameter, cu) [-] 1.00 (applied to strength parameter, phi)

Minimim tail void grout pressure ptv [kPa] 350

Minimum nominal face pressure Flagfpmin [-] Y (Yes or any other input is No)fpmin [%] 30% (percentage of full porewater pressure at tunnel level)

Nominal intial compressed air pressure pair-0 [kPa] 80 (compressed air pressure to be applied initially for cutterhead intervention, applies only if free air intervention is possible)

Design Parameters 10 9 7 8 2 3x c ' f g cu K0 E

Soil / Rock Type [kPa] [deg] [kN/m3] [kPa] [-] [MPa]Fill 0.00 30.00 18.70 20.00 0.50 7.00F1 0.00 29.00 19.00 0.00 0.50 13.00F2 0.00 24.00 18.50 21.00 0.75 5.50E 0.00 22.00 15.00 10.00 0.75 1.70GVI 3.00 30.00 18.50 90.00 0.50 37.00GV L 4.00 31.00 19.50 200.00 0.50 60.00GV 4.00 31.00 19.50 200.00 0.50 90.00GIV 50.00 40.00 23.00 250.00 0.30 300.00GIII 300.00 45.00 23.00 0.00 0.30 3000.00GII 500.00 50.00 24.00 0.00 0.30 6000.00GV50 4.00 31.00 19.50 200.00 0.50 50.00GV70 4.00 31.00 19.50 200.00 0.50 70.00GV90 4.00 31.00 19.50 200.00 0.50 90.00GV120 4.00 31.00 19.50 200.00 0.50 120.00GV150 4.00 31.00 19.50 200.00 0.50 150.00GVI50 3.00 30.00 18.50 90.00 0.50 50.00

N-1 4.00 31.00 21.30 0.00 0.50 588.50N-2 50.00 40.00 23.50 0.00 0.50 3369.20N-3 3.00 30.00 18.50 0.00 0.50 43.40N-4 3.00 30.00 18.50 0.00 0.50 37.00N-5 3.00 30.00 18.50 0.00 0.50 37.00

S-1 4.00 31.00 21.30 0.00 0.50 1433.10S-2 4.00 31.00 23.50 0.00 0.50 1024.60S-3 300.00 45.00 21.30 0.00 0.30 1476.90S-4 4.00 31.00 19.00 0.00 0.50 62.40S-5 3.00 30.00 18.50 0.00 0.50 43.00S-6 3.00 30.00 18.50 0.00 0.50 3923.10S-7 3.00 30.00 18.50 0.00 0.50 47.60S-8 3.00 30.00 18.50 0.00 0.50 37.00

C918-TBM-Face Press_B.Panjang Bound_RevC Input

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1 2 3 4 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

(mDMD) (mDMD) (m) (m) (m) (m) (m) (m) kN/m3 kN/m3 kN/m3 kN/m3 kN/m3 kN/m3 kN/m2

GWcond

Chainage Geotechnical Unit at Tunnel

Axis

Ground Level Top of RailLayer 1 Layer 2 Layer 3 Layer 4 Layer 5 Layer 6

Z1 Z2 Z3 Z4 Z5 Z6 1 2 3 4 5 6 Additionalsurcharge

Effective Lateral Earth Pressure

Coefficient1 46+735.651 GIII 103.800 85.000 FILL E F2 F1 GVI GIII 2.30 4.70 4.00 1.40 1.70 3.17 18.7 15 18.5 19 18.5 23 0 0.302 46+700.000 S-6 103.000 84.200 FILL E E F1 S-6 S-6 2.70 2.20 2.20 3.30 3.70 3.17 18.7 15 15 19 18.5 18.5 0 0.503 46+675.000 GIII 104.000 83.500 FILL E F1 F1 GIII GIII 3.60 4.00 2.40 2.40 3.40 3.17 18.7 15 19 19 23 23 0 0.304 46+650.000 S-5 104.000 83.000 FILL E F1 GVI GVI S-5 4.00 4.00 6.00 1.00 1.30 3.17 18.7 15 19 18.5 18.5 18.5 0 0.505 46+625.000 GVI 103.700 82.000 FILL E F1 F2 GVI GVI 2.80 1.31 3.70 6.00 3.20 3.17 18.7 15 19 18.5 18.5 18.5 0 0.506 46+600.000 S-5 104.000 81.000 FILL E F2 F1 GVI S-5 3.00 3.00 2.00 7.00 3.30 3.17 18.7 15 18.5 19 18.5 18.5 0 0.507 46+575.000 S-4 104.000 80.500 FILL E F1 F1 GVI S-4 2.90 3.00 4.40 4.40 4.10 3.17 18.7 15 19 19 18.5 19 0 0.508 46+550.000 S-4 104.000 80.000 FILL E F1 GVI GVI S-4 3.00 4.00 6.00 3.00 3.30 3.17 18.7 15 19 18.5 18.5 19 0 0.509 46+525.000 GVI 104.000 79.000 FILL F2 E F1 GVI GVI 2.90 1.91 2.90 3.50 9.10 3.17 18.7 18.5 15 19 18.5 18.5 0 0.509a 46+523.500 GVI 104.000 79.000 FILL F2 E F1 GVI GVI 2.90 1.91 2.90 3.50 9.10 3.17 18.7 18.5 15 19 18.5 18.5 0 0.509b 46+510.970 GVI 101.400 78.629 FILL F2 E F1 GVI GVI 0.67 1.91 2.90 3.50 9.10 3.17 18.7 18.5 15 19 18.5 18.5 0 0.5010 46+500.000 GV70 104.000 78.000 FILL E F1 GVI GVI GV70 3.00 6.00 4.00 4.00 4.30 3.17 18.7 15 19 18.5 18.5 19.5 0 0.5011 46+475.000 GV70 104.200 77.700 FILL E F2 F1 GVI GV70 2.80 7.50 1.40 2.40 7.70 3.17 18.7 15 18.5 19 18.5 19.5 0 0.5012 46+450.000 GV90 104.500 77.000 FILL E F1 GVI GV70 GV90 3.00 6.80 4.80 5.60 2.60 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5013 46+425.000 GV90 99.100 76.100 FILL E F2 GVI GV50 GV90 0.00 2.10 7.50 4.00 4.70 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5014 46+400.000 GV90 99.000 75.000 FILL E F2 GVI GV50 GV90 0.00 1.71 6.00 4.00 7.60 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5015 46+375.000 GV90 99.000 74.600 FILL E F2 GVI GV90 GV90 0.00 3.31 2.90 5.30 8.20 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5016 46+350.000 GV90 99.200 74.000 FILL E F2 GVI GV90 GV90 0.00 4.30 2.01 10.60 3.60 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5017 46+325.000 GV50 99.000 73.500 FILL E F2 F1 GVI GV50 0.00 1.00 2.00 1.50 16.30 3.17 18.7 15 18.5 19 18.5 19.5 0 0.5018 46+300.000 GV50 99.700 73.000 FILL E F2 F1 GVI GV50 0.00 0.00 1.71 2.00 18.30 3.17 18.7 15 18.5 19 18.5 19.5 0 0.5019 46+275.000 GV90 100.400 72.200 FILL E GVI GVI GV90 GV90 0.00 1.21 10.00 10.00 2.30 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5020 46+250.000 GV120 100.300 71.500 FILL E F2 GVI GV120 GV120 0.00 0.00 4.90 14.60 4.60 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5021 46+225.000 GV150 99.800 71.100 FILL GVI GVI GV GV50 GV150 0.00 4.40 5.90 5.90 7.80 3.17 18.7 18.5 18.5 19.5 19.5 19.5 0 0.5022 46+200.000 S-3 99.500 71.000 FILL GVI GVI GVI GV120 S-3 0.00 0.00 6.00 7.00 10.80 3.17 18.7 18.5 18.5 18.5 19.5 21.3 0 0.3023 46+175.000 GV120 99.200 69.900 FILL GVI GVI GV70 GV120 GV120 0.00 3.70 5.70 7.60 7.60 3.17 18.7 18.5 18.5 19.5 19.5 19.5 0 0.5024 46+150.000 S-2 99.000 69.000 FILL E GVI GV120 GV120 S-2 0.00 0.00 7.00 15.00 3.30 3.17 18.7 15 18.5 19.5 19.5 23.5 0 0.5025 46+125.000 GV120 99.300 68.700 FILL E GVI GV70 GV120 GV120 0.00 0.00 9.00 8.45 8.45 3.17 18.7 15 18.5 19.5 19.5 19.5 0 0.5026 46+100.000 GV120 99.100 68.200 FILL E GVI GVI GV120 GV120 0.00 0.30 5.00 5.00 15.90 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5027 46+075.000 GV120 99.000 67.900 FILL E GVI GV50 GV90 GV120 0.00 1.80 9.60 7.50 7.50 3.17 18.7 15 18.5 19.5 19.5 19.5 0 0.5028 46+050.000 GV120 98.000 67.800 FILL E F1 GVI GV120 GV120 0.00 1.31 2.80 8.30 13.10 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5029 46+025.000 GV120 97.900 68.100 FILL E F2 GVI GV90 GV120 0.00 0.91 6.50 5.00 12.70 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5030 46+000.000 GV120 98.300 68.600 FILL E F2 GVI GV90 GV120 0.00 2.01 5.50 5.80 11.70 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5031 45+975.000 S-1 98.300 69.200 FILL E F1 GVI GV90 S-1 0.00 2.50 3.00 8.20 10.70 3.17 18.7 15 19 18.5 19.5 21.3 0 0.5032 45+950.000 S-1 98.300 70.000 FILL E F1 GVI GV90 S-1 0.00 3.10 2.20 9.00 9.30 3.17 18.7 15 19 18.5 19.5 21.3 0 0.5033 45+925.000 GV90 104.000 69.300 FILL E F1 GVI GV90 GV90 3.81 5.40 3.00 8.00 9.80 3.17 18.7 15 19 18.5 19.5 19.5 0 0.5034 45+900.000 GV90 104.200 71.500 FILL E F2 GVI GV90 GV90 3.70 4.30 3.21 6.90 9.90 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5035 45+875.000 GV90 104.500 72.200 FILL E F2 GVI GV90 GV90 4.20 3.60 3.90 6.10 9.80 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5036 45+850.000 GV50 105.500 73.000 FILL E F2 GVI GV50 GV50 5.00 4.01 3.40 6.80 8.60 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.5037 45+825.000 GII 105.000 74.000 FILL E F2 GVI GII GII 4.11 4.30 3.00 8.90 6.00 3.17 18.7 15 18.5 18.5 24 24 0 0.3038 45+809.881 GII 105.200 73.900 FILL E F1 GVI GII GII 3.50 5.10 2.50 9.50 6.00 3.17 18.7 15 19 18.5 24 24 0 0.30

CHI1 46+635.000 GVI 104.000 82.300 FILL E F1 F2 GVI GVI 3.20 1.90 3.11 5.60 3.20 3.17 18.7 15 19 18.5 18.5 18.5 0 0.50CHI2 46+380.000 GV90 104.000 74.600 FILL E F2 GVI GV90 GV90 3.21 5.10 2.90 5.30 8.20 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50CHI3 46+276.000 GV120 105.400 72.200 FILL E GVI GVI GV120 GV120 3.00 3.21 10.00 10.00 2.30 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50CHI4 46+132.000 GV120 104.300 68.700 FILL E GVI GV70 GV120 GV120 3.00 1.70 9.30 8.45 8.45 3.17 18.7 15 18.5 19.5 19.5 19.5 0 0.50CHI5 46+035.000 GV120 102.900 68.100 FILL E F2 GVI GV90 GV120 2.00 3.91 6.50 5.00 12.70 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50CHI6 46+005.000 GV120 103.300 68.600 FILL E F2 GVI GV90 GV120 2.51 4.50 5.50 5.80 11.70 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50CHI7 45+980.000 S-1 103.300 69.200 FILL E F1 GVI GV90 S-1 2.50 5.00 3.00 8.20 10.70 3.17 18.7 15 19 18.5 19.5 21.3 0 0.50CHI8 45+870.000 GV90 104.500 72.200 FILL E F2 GVI GV90 GV90 4.20 3.60 3.90 6.10 9.80 3.17 18.7 15 18.5 18.5 19.5 19.5 0 0.50

Bulk WeightSoil Layers DepthSoil Layer Type

Cutterhead Intervention

Geotechnical Design Parameters for Expo Bound DTL MRT Project Expo Bound - C918

MasterGTInfo-C918_Expo MasterGTInfo-C918_Expo

Page 19


Project - Contract C918 Expo Bound (TKK To BTN)INPUT PARAMETERS - TUNNEL GEOMETRY AND GROUND PROPERTIES

Tunnel GeometryTBM diameter D [m] 6.60Cutterhead opening ratio cor [%] 60% (percent of area covered by cutting wheel)Relevant face diameter D rel [m] 4.17Length of TBM cutter head P [m] 0.89Length of screw conveyor Lscrew [m] naSurcharge q [kPa] 20.00Overall factor of safety FS tot [-] 1.20 (applied to driving forces in force equilibrium)

Air pressure FOS FS air [-] 1.00 (normally use 1.0 - especially in shallow ground order to avoid air blow-out)

Soil material, partial strength factor cu [-] 1.00 (applied to strength parameter, cu) [-] 1.00 (applied to strength parameter, phi)

Minimim tail void grout pressure ptv [kPa] 350

Minimum nominal face pressure Flagfpmin [-] Y (Yes or any other input is No)fpmin [%] 30% (percentage of full porewater pressure at tunnel level)

Nominal intial compressed air pressure pair-0 [kPa] 80 (compressed air pressure to be applied initially for cutterhead intervention, applies only if free aire intervention is possible)

Design Parameters 10 9 7 8 2 3x c ' f g cu K0 E

Soil / Rock Type [kPa] [deg] [kN/m3] [kPa] [-] [MPa]Fill 0.00 30.00 18.70 20.00 0.50 7.00F1 0.00 29.00 19.00 0.00 0.50 13.00F2 0.00 24.00 18.50 21.00 0.75 5.50E 0.00 22.00 15.00 10.00 0.75 1.70GVI 3.00 30.00 18.50 90.00 0.50 37.00GV L 4.00 31.00 19.50 200.00 0.50 60.00GV 4.00 31.00 19.50 200.00 0.50 90.00GIV 50.00 40.00 23.00 250.00 0.30 300.00GIII 300.00 45.00 23.00 0.00 0.30 3000.00GII 500.00 50.00 24.00 0.00 0.30 6000.00GV50 4.00 31.00 19.50 200.00 0.50 50.00GV70 4.00 31.00 19.50 200.00 0.50 70.00GV90 4.00 31.00 19.50 200.00 0.50 90.00GV120 4.00 31.00 19.50 200.00 0.50 120.00GV150 4.00 31.00 19.50 200.00 0.50 150.00GVI50 3.00 30.00 18.50 90.00 0.50 50.00

N-1 4.00 31.00 21.30 0.00 0.50 588.50N-2 50.00 40.00 23.50 0.00 0.50 3369.20N-3 3.00 30.00 18.50 0.00 0.50 43.40N-4 3.00 30.00 18.50 0.00 0.50 37.00N-5 3.00 30.00 18.50 0.00 0.50 37.00

S-1 4.00 31.00 21.30 0.00 0.50 1433.10S-2 4.00 31.00 23.50 0.00 0.50 1024.60S-3 300.00 45.00 21.30 0.00 0.30 1476.90S-4 4.00 31.00 19.00 0.00 0.50 62.40S-5 3.00 30.00 18.50 0.00 0.50 43.00S-6 3.00 30.00 18.50 0.00 0.50 3923.10S-7 3.00 30.00 18.50 0.00 0.50 47.60S-8 3.00 30.00 18.50 0.00 0.50 37.00

C918-TBM-Face Press_Expo Bound Input

Page 20



Appendix 3: Recommended Face Pressure Values

Page 21


Summary of Recommended Values Project - Contract C918 Bukit Panjang Bound(TKK To BTN) 1.2

45+809.88 1.4 80% 1101 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17

CALCULATED Compressed RECOMMENDED MINIMUM Hydrostatic MAXIMUM

Face TARGET Total Tail Void Grout air INITIAL Compr. INITIAL Compr. GroundwaterNo. Applicable Chainage Segment Rings just above just below at Pressure Face Pressure Octaeder stress Grouting Intervention Air Pressure Air Pressure Pressure Face Pressure

CROWN CROWN AXIS at AXIS at AXIS at AXIS Pressure Scenario for Intervention for Intervention at AXIS at AXISfrom to from to [kPa] [kPa] [kPa] [kPa] [kPa] [kPa] [kPa] [kPa] [kPa]

38 45+810 45+825 0 11 GII GII GII 94 330 495 350 - 500 Pressure --> 110 110 312 38037 45+825 45+850 11 29 GV GV70 GV70 93 330 509 350 - 500 Pressure --> 110 110 311 38036 45+850 45+875 29 47 GV70 GV70 GV70 250 330 504 350 - 500 Free air possible 248 110 310 38035 45+875 45+900 47 64 GV70 GV70 GV70 259 330 525 350 - 500 Free air possible 259 110 323 38034 45+900 45+925 64 82 GV70 GV150 GV150 268 330 538 350 - 500 Free air possible 260 110 325 38033 45+925 45+950 82 100 GV70 GV150 GV150 97 330 532 350 - 500 Free air possible 110 110 323 38032 45+950 45+975 100 118 GV150 N-1 N-1 93 320 514 350 - 500 Pressure --> 110 110 309 380

Geotechnical Unit

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Table 07/08/2012

31 45+975 46+000 118 136 GV120 GV120 GV150 259 320 520 350 - 500 Pressure --> 254 110 317 38030 46+000 46+025 136 154 GV120 GV120 GV150 263 350 504 350 - 500 Free air possible 260 110 325 38029 46+025 46+050 154 172 GV70 GV70 GV150 98 350 534 350 - 500 Free air possible 110 110 326 38028 46+050 46+075 172 189 GIII GIII GIII 97 350 504 350 - 500 Free air possible 110 110 324 38027 46+075 46+100 189 207 GIII GIII GIII 97 350 522 350 - 500 Free air possible 110 110 325 38026 46+100 46+125 207 225 GV120 GIV GIV 104 350 522 366 - 500 Free air possible 110 110 345 38025 46+125 46+150 225 243 GV70 GV120 GV120 283 350 570 367 - 500 Free air possible 277 110 346 38024 46+150 46+175 243 261 GV150 GV150 GV150 284 350 572 367 - 500 Pressure --> 277 110 346 38023 46+175 46+200 261 279 GV150 GV150 GV150 105 350 576 370 - 500 Free air possible 110 110 349 38022 46+200 46+225 279 297 GIII GIII GIII 105 350 555 370 - 500 Pressure --> 110 110 349 38021 46+225 46+250 297 314 GVI GIII GIII 99 350 513 350 - 500 Free air possible 110 110 329 38020 46+250 46+275 314 332 GVI GIII GIII 97 350 504 350 - 500 Free air possible 110 110 323 38019 46+275 46+300 332 350 GV120 GV120 GV120 265 320 528 350 - 500 Free air possible 253 110 316 38018 46+300 46+325 350 368 GV120 GV120 GV120 256 320 511 350 - 500 Free air possible 246 110 308 38017 46+325 46+329 368 386 GV120 GV120 GV120 249 300 497 350 - 500 Free air possible 241 110 301 380

16b 46+329 46+341 371 404 GV120 GV120 GV120 246 300 460 350 - 500 Free air possible 241 110 301 38016a 46+341 46+350 380 422 GV120 GV120 GV120 249 300 497 350 - 500 Free air possible 241 110 301 38016 46+350 46+375 386 404 GV90 GV90 GV90 237 300 477 350 - 500 Free air possible 234 110 293 33015 46+375 46+400 404 422 GV50 GV70 GV70 234 300 469 350 - 500 Free air possible 229 110 286 33014 46+400 46+425 422 439 GV50 GV50 GV70 229 280 458 350 - 500 Free air possible 223 110 279 33013 46+425 46+450 439 457 GV50 GV50 GV50 222 280 443 350 - 500 Free air possible 216 110 270 33012 46+450 46+475 457 475 GV50 GV50 GV50 218 280 433 350 - 500 Free air possible 210 110 263 33011 46+475 46+500 475 493 GVI GVI GVI 218 260 418 350 - 500 Free air possible 205 110 256 33010 46+500 46+525 493 511 GVI GVI GVI 213 260 410 350 - 500 Free air possible 198 110 248 3309 46+525 46+535 511 529 GVI GVI GVI 200 240 383 350 - 500 Free air possible 186 110 232 330

8b 46+535 46+541 518 547 GVI GVI GVI 197 240 351 350 - 500 Free air possible 186 110 232 3308a 46+541 46+550 522 564 GVI GVI GVI 200 240 383 350 - 500 Free air possible 186 110 232 3308 46+550 46+575 529 547 GVI GVI GV70 197 240 382 350 - 500 Free air possible 186 110 232 3307 46+575 46+600 547 564 GVI N-3 GV70 195 240 376 350 - 500 Free air possible 181 110 226 3006 46+600 46+625 564 582 GVI N-3 N-3 189 220 361 350 - 500 Pressure --> 174 110 218 3005 46+625 46+650 582 600 GVI N-3 N-3 184 220 349 350 - 500 Free air possible 169 110 211 3004 46+650 46+675 600 618 GVI N-3 GV70 176 220 337 350 - 500 Free air possible 162 110 203 3003 46+675 46+700 618 636 GVI GVI GVI 172 200 324 350 - 500 Pressure --> 157 110 196 2502 46+700 46+727 636 655 GVI GIII GIII 56 200 294 350 - 500 Pressure --> 110 67 188 2501 46+727 x 655 x GIII GIII GIII 54 200 292 350 - 500 Pressure --> 110 65 180 250

1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\[C918-TBM-Face Press_B.Panjang Bound_RevB.xls]TableNOTES: NOTE 1) NOTE 2) NOTE 3) NOTE 4) NOTE 5) NOTE 6)

1) These pressure values are orientated on the calculated pressures and represent the recommended range.2) Beyond this pressure level, there is a risk of heaving the ground surface; (1+2+3)/33) Recommended tail void pressure range. Actual minimum pressure is defined by method statement. Actual maximum pressure is defined by segmental lining design.4) Recommended compressed air pressure required at the beginning of cutterhead intervention. If the ground is found stable after visual inspection at each step, the pressure can be dropped in steps to atmospheric.5) Calculated minimum compressed air pressure for intial entry. During the air pressure reduction procesdure, face stability should be verified insitu at this pressure level.

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Table 07/08/2012Page 22


Project - Contract C918 Bukit Panjang Bound(TKK To BTN)Recommended Slurry Pressure Range

300

350

400

DTSS

CCLCluny Court

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Table 07/08/2012

100

150

200

250

P

R

E

S

S

U

R

E

[

k

P

a

]

Vl= 1.0% atShop Houses

CALCULATED Face Pressure at AXISMINIMUM Face Pressure at AXISRECOMMENDED TARGET Face Pressure at AXISHydrostatic Groundwater Pressure at AXIS

0

50

100

45+70045+80045+90046+00046+10046+20046+30046+40046+50046+60046+70046+800

CHAINAGE

CALCULATED Face Pressure at AXIS Hydrostatic Groundwater Pressure at AXIS

Verification Monitoring for CCL46+010 and 45+935

RECOMMENDED INITIAL Compr. Air Pressure for InterventionMINIMUM INITIAL Compr. Air Pressure for Intervention

CALCULATED Face Pressure at AXIS Hydrostatic Groundwater Pressure at AXIS

RECOMMENDED TARGET Face Pressure at AXIS RECOMMENDED INITIAL Compr. Air Pressure for Intervention

MINIMUM INITIAL Compr. Air Pressure for Intervention MAXIMUM Face Pressure at AXIS

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Table 07/08/2012Page 23


Summary of Recommended Values Project - Contract C918 Expo Bound (TKK To BTN) 1.2

45+809.88 1.4 80% 1101 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17

CALCULATED Compressed RECOMMENDED MINIMUM Hydrostatic MAXIMUM

Face TARGET Total Tail Void Grout air INITIAL Compr. INITIAL Compr. GroundwaterNo. Applicable Chainage Segment Rings just above just below at Pressure Face Pressure Octaeder stress Grouting Intervention Air Pressure Air Pressure Pressure Face Pressure

CROWN CROWN AXIS at AXIS at AXIS at AXIS Pressure Scenario for Intervention for Intervention at AXIS at AXISfrom to from to [kPa] [kPa] [kPa] [kPa] [kPa] [kPa] [kPa] [kPa] [kPa]

38 45+810 45+825 0 11 GII GII GII 90 330 478 350 - 500 As recommended 110 108 300 37037 45+825 45+850 11 29 GII GII GII 89 330 475 350 - 500 As recommended 110 107 297 37036 45+850 45+875 29 47 GV50 GV50 GV50 256 330 514 350 - 500 Free air possible 250 110 312 37035 45+875 45+900 47 64 GV90 GV90 GV90 256 330 513 350 - 500 Free air possible 248 110 310 37034 45+900 45+925 64 82 GV90 GV90 GV120 258 330 517 355 - 500 Free air possible 251 110 314 38033 45+925 45+950 82 100 GV90 GV90 GV120 271 340 547 350 500 Free air possible 267 110 334 380

Geotechnical Unit

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Table 07/08/2012

33 45+925 45+950 82 100 GV90 GV90 GV120 271 340 547 350 - 500 Free air possible 267 110 334 38032 45+950 45+975 100 118 GV90 S-1 S-1 96 340 472 350 - 500 As recommended 110 110 320 38031 45+975 46+000 118 136 GV90 S-1 S-1 98 340 487 355 - 500 As recommended 110 110 328 38030 46+000 46+025 136 154 GV90 GV120 GV120 275 340 493 356 - 500 Free air possible 267 110 334 38029 46+025 46+050 154 172 GV90 GV120 GV120 279 340 498 360 - 500 Free air possible 268 110 335 38028 46+050 46+075 172 189 GV120 GV120 GV120 282 350 504 369 - 500 Free air possible 271 110 339 38027 46+075 46+100 189 207 GV90 GV120 GV120 287 350 518 367 - 500 Free air possible 278 110 348 38026 46+100 46+125 207 225 GV120 GV120 GV120 289 350 519 364 - 500 Free air possible 277 110 346 38025 46+125 46+150 225 243 GV120 GV120 GV150 103 350 515 358 - 500 Free air possible 110 110 343 38024 46+150 46+175 243 261 GV120 S-2 S-2 101 340 516 351 - 500 As recommended 110 110 337 38023 46+175 46+200 261 279 GV120 GV120 GV150 99 340 494 350 - 500 Free air possible 110 110 330 38022 46+200 46+225 279 297 GV120 S-3 S-3 97 340 450 350 - 500 As recommended 110 110 322 38021 46+225 46+250 297 314 GV50 GV150 GV150 273 340 483 350 - 500 Free air possible 259 110 324 38020 46+250 46+275 314 332 GV120 GV120 GV120 269 340 479 350 - 500 Free air possible 260 110 325 37019 46+275 46+300 332 350 GV90 GV90 GV90 261 320 465 350 - 500 Free air possible 255 110 319 37018 46+300 46+325 350 368 GVI GV50 GV50 251 320 443 350 - 500 Free air possible 243 110 304 37018 46 300 46 325 350 368 GVI GV50 GV50 251 320 443 350 500 Free air possible 243 110 304 37017 46+325 46+350 368 386 GVI GV50 GV50 241 300 422 350 - 500 Free air possible 234 110 292 37016 46+350 46+375 386 404 GV90 GV90 GV90 234 300 412 350 - 500 Free air possible 231 110 289 37015 46+375 46+400 404 422 GV90 GV90 GV90 233 280 405 350 - 500 Free air possible 225 110 281 37014 46+400 46+425 422 439 GV50 GV90 GV90 233 280 402 350 - 500 Free air possible 222 110 277 33013 46+425 46+450 439 457 GV50 GV90 GV90 223 280 383 350 - 500 Free air possible 214 110 267 33012 46+450 46+475 457 475 GV70 GV90 GV90 214 270 427 350 - 500 Free air possible 210 110 262 33011 46+475 46+500 475 493 GVI GV70 GV70 203 270 406 350 - 500 Free air possible 202 110 252 33010 46+500 46+511 493 501 GVI GV70 GV70 202 270 402 350 - 500 Free air possible 198 110 247 3309b 46+511 46+524 501 510 GVI GVI GV50 202 270 366 350 - 500 Free air possible 192 110 241 3309a 46+524 46+525 510 511 GVI GVI GV50 202 270 392 350 - 500 Free air possible 190 110 237 3309 46+525 46+550 511 529 GVI GVI GV50 202 270 392 350 - 500 Free air possible 190 110 237 3308 46+550 46+575 529 547 GVI S-4 GV70 191 240 376 350 - 500 Free air possible 182 110 227 3307 46+575 46+600 547 564 GVI S-4 GV70 190 240 371 350 - 500 Free air possible 178 110 222 3006 46+600 46+625 564 582 GVI S-5 S-5 190 240 361 350 - 500 As recommended 174 110 217 3005 46+625 46+650 582 600 GVI GVI GV50 181 240 344 350 - 500 Free air possible 163 110 204 3004 46+650 46+675 600 618 GVI S-5 GV50 172 210 328 350 - 500 Free air possible 158 110 197 2403 46+675 46+700 618 636 GIII GIII GIII 58 210 312 350 - 500 As recommended 110 70 192 2402 46+700 46+736 636 661 S-6 S-6 GII 52 210 271 350 - 500 As recommended 110 62 175 2401 46+736 x 661 x GVI GIII GIII 52 210 274 350 - 500 As recommended 110 62 175 240

1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\[C918-TBM-Face Press_Expo Bound RevB.xls]TableNOTES: NOTE 2) NOTE 3) NOTE 4) NOTE 5) NOTE 6)

1) These pressure values are orientated on the calculated pressures and represent the recommended range.2) Beyond this pressure level, there is a risk of heaving the ground surface; (1+2+3)/33) Recommended tail void pressure range. Actual minimum pressure is defined by method statement. Actual maximum pressure is defined by segmental lining design.4) Recommended compressed air pressure required at the beginning of cutterhead intervention. If the ground is found stable after visual inspection at each step, the pressure can be dropped in steps to atmospheric.5) Calculated minimum compressed air pressure for intial entry. During the air pressure reduction procesdure, face stability should be verified insitu at this pressure level.6) This column is provided for information. Recommended face pressure values for TBM operation are provided in Column with Note 1).

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Table 07/08/2012Page 24


Project - Contract C918 Expo Bound (TKK To BTN)Recommended Slurry Pressure Range

300

350

400

DTSS

CCLCluny

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Table 07/08/2012

100

150

200

250

P

R

E

S

S

U

R

E

[

k

P

a

]

Shop Houses

0

50

45+70045+80045+90046+00046+10046+20046+30046+40046+50046+60046+70046+800

CHAINAGE

CALCULATED Face Pressure at AXIS Hydrostatic Groundwater Pressure at AXISRECOMMENDED TARGET Face Pressure at AXIS RECOMMENDED INITIAL Compr. Air Pressure for InterventionMINIMUM INITIAL Compr. Air Pressure for Intervention MAXIMUM Face Pressure at AXIS

Verification Monitoring for CCL46+010 and 49+935

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Table 07/08/2012Page 25



Appendix 4: Cutter Head Intervention - Planned stoppage location

- Selected analysis results

Page 26


Summary of Recommended Values - Cutterhead Interventions Project - Contract C918 Bukit Panjang Bound(TKK To BTN) 1.2

45+809.88 1.4 80% 1101 2 3 4 5 6 7 8 9 10 11

Cutter Head Intervention Hydrostatic

Segment RECOMMENDED MINIMUM Groundwater

No. Applicable Chainage Ring just above just below at at Intervention INITIAL Compr. INITIAL Compr. PressureCROWN CROWN AXIS INVERT Scenario Air Pressure Air Pressure at AXIS

from approx. [kPa] [kPa] [kPa] [kPa]CHI-1 46+636 590 GVI GV50 GV50 GV70 Free air possible 166 110 208

Geotechnical Unit

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Interv-Table 07/08/2012

CHI-2 46+430 443 GV70 GV70 GV70 GV70 Free air possible 215 110 269CHI-3 46+341 380 GV120 GV120 GV90 GV120 Free air possible 241 110 301CHI-4 46+280 336 GV70 GV90 GV150 GV150 Free air possible 254 110 318CHI-5 46+131 229 GV70 GV120 GIII GIII Pressure --> 110 0 343CHI-6 46+020 150 GV120 GV120 GV150 GV150 Free air possible 262 110 327CHI-7 45+870 43 GV90 GV90 GV90 GV90 Free air possible 253 110 316

1 2 3 4 5 6 7 8 9 10 11C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\[C918-TBM-Face Press_Expo Bound RevB.xls]TableNOTES: NOTE 1) NOTE 2) NOTE 3)

1) Indicates whether as per design free air intervention is principally considered possible2) If free air intervention is principlally possible, this is the minimum air pressure to be applied intially at the beginning of a cutterhead intervention3) If flowing conditions occur, the air pressure shall be increased to the recommended face slurry pressure

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Interv-Table 07/08/2012Page 27


Project - Contract C918 Bukit Panjang Bound(TKK To BTN)Recommended Compressed Air Pressure Range for Interventions

300

350

400

50

100

150

200

250

R

E

S

S

U

R

E

[

k

P

a

]

RECOMMENDED INITIAL Compr. Air PressureMINIMUM INITIAL Compr. Air PressureHydrostatic Hydrostatic Pressure at AXIS

0

50

45+76145+86845+97546+08146+18846+29546+40146+50846+61546+721

P

CHAINAGE

RECOMMENDED INITIAL Compr. Air Pressure MINIMUM INITIAL Compr. Air Pressure Hydrostatic Hydrostatic Pressure at AXIS

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Bukit Panjang\C918-TBM-Face Press_B.Panjang Bound_RevB // Interv-Table 07/08/2012Page 28


Summary of Recommended Values - Cutterhead Interventions Project - Contract C918 Expo Bound (TKK To BTN) 1.2

45+809.88 1.4 80% 1101 2 3 4 5 6 7 8 9 10 11

Cutter Head Intervention Hydrostatic

Applicable Segment RECOMMENDED MINIMUM Groundwater

No. Chainage Ring just above just below at at Intervention INITIAL Compr. INITIAL Compr. PressureCROWN CROWN AXIS INVERT Scenario Air Pressure Air Pressure at AXIS

approximately approx. [kPa] [kPa] [kPa] [kPa]CHI-1 46+635 589 GVI GVI GVI GV50 Free air possible 163 110 204

Geotechnical Unit

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Interv-Table 07/08/2012

CHI-2 46+380 407 GV90 GV90 GV70 GV90 Free air possible 225 110 281CHI-3 46+276 333 GV120 GV120 GV120 GV120 Free air possible 255 110 319CHI-4 46+132 230 GV120 GV120 GV120 GV120 Free air possible 274 110 343CHI-5 46+035 161 GV90 GV120 GV120 GIII Free air possible 110 0 335CHI-6 46+005 139 GV90 GV120 GV120 GIII Free air possible 110 0 334CHI-7 45+980 122 GV90 S-1 GV120 GIII Pressure --> 110 0 328CHI-8 45+870 43 GV90 GV90 GV120 GIII Free air possible 110 0 310

1 2 3 4 5 6 7 8 9 10 11C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\[C918-TBM-Face Press_Expo Bound RevB.xls]TableNOTES: NOTE 1) NOTE 2) NOTE 3)

1) Indicates whether as per design free air intervention is principally considered possible2) If free air intervention is principlally possible, this is the minimum air pressure to be applied intially at the beginning of a cutterhead intervention3) If flowing conditions occur, the air pressure shall be increased to the recommended face slurry pressure

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Interv-Table 07/08/2012Page 29


Project - Contract C918 Expo Bound (TKK To BTN)Recommended Compressed Air Pressure Range for Interventions

300

350

400

50

100

150

200

250

R

E

S

S

U

R

E

[

k

P

a

]

RECOMMENDED INITIAL Compr. Air PressureMINIMUM INITIAL Compr. Air PressureHydrostatic Hydrostatic Pressure at AXIS

0

50

45+76145+86845+97546+08146+18846+29546+40146+50846+61546+721

P

CHAINAGE

RECOMMENDED INITIAL Compr. Air Pressure MINIMUM INITIAL Compr. Air Pressure Hydrostatic Hydrostatic Pressure at AXIS

C:\Documents and Settings\user\Desktop\918 Tunnel\Face Pressure Calculations\BTN-TKK\Rev B\Expo\C918-TBM-Face Press_Expo Bound RevB // Interv-Table 07/08/2012Page 30

App 1.pdfW918TUN-SO9101H.pdfW918TUN-SO9102J.pdfW918TUN-SO9103G.pdfW918TUN-SO9106G.pdfW918TUN-SO9107H.pdfW918TUN-SO9108F.pdf

App 2.pdf10.pdf111.pdf112.pdf113.pdf

App 3.pdf10.pdf20.pdf

App 4.pdf110.pdf111.pdf