Project

Execution

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one step towards project management excellence...

Palla Narasimhudu

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Introduction:-

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Objectives:-

Identify, Analyze the Risk Factors

Perform Qualitative and Quantitative Analysis

Plan for Risk Mitigation

Monitor and Control throughout the project life cycle

Control of future risks and Pro-activeness

Develop Risk Response strategies and Contingency plans for unexpected

Risk register for further similar projects

Scope :-

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Risks in EPC Project:-

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Engineering

• Project Feasibility

• Viability

• Technology selection

• Design

• Joint venture

• Geographical conditions

• Funding

Construction

• Utility and Traffic diversion*

• Survey works

• Diaphragm Walling*

• Excavation

• Decking and steel struts*

• Tunnel mining and cross passage*

• Accidents/ Losses of lives

• Non- availability of manpower

• Confined space

• Quality

• Clarity less communication

• Soil condition

• Bad Infrastructure

Procurement

• Underestimate the need

• Quality supplier selection

• Offers fail to meet the needs

• Insufficient funds

Unforeseen

• Sudden collapse of soil

• Heavy rains and floods

• Sudden settlements

• Extreme temperature

Execution

• Delay in land acquisition

• Inexperience project management/ team

• Ineffective decomposition of work

• Regulatory issues

• Failure to forecast

• Design changes

• Stake holder management

• Safety/ Environmental

• Political

• Decision making

• Currency / commodities fluctuation

*varies for different projects

228m

24m19m

228m

24m19m

228m

24m19m

EGMORE NEHRU PARK KMC PACHAIPPA SHENOY

NAGAR

Station Length = 228m + 228m + 228m = 684m

Tunnel Length = 947m + 573m + 898m + 966 = 3384m

22m 22m 24m

Cross Passage = 3nos + 2nos + 3nos + 3nos = 11nos

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Case Study- UAA-04 CMRL Project

Risk identification and action plans- UAA-04

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Existing Diverted-1 Diverted-2

Impact- Road diversion and D-Wall Construction

Mitigation-1) Stage wise diversion2) Interchange and inter-displacement of utilities for D-Wall construction

Risk-Space constraint in Utility diversionUtilities running across station

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Risk-Space constraint in traffic diversion

Impact-D-Wall ConstructionShaft Handover for TBM launching

Mitigation-1) Stage wise diversion 2) Decking for traffic

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UG Metro Station - Plan

20m 20m40m

60m

Risk- Excavation with strut Impact- Possible Delay in shaft handover for TBM launch

Mitigation-1) D-Wall design change without strut2) Modified excavation sequence of 12m max with additional centre opening

12m

Post Risk Analysis-

• Poly-mud level was 1.5mt below the Ground Level

• Due to heavy rain there was contamination of seepage water and polymer properties may reduce which may beinsufficient to withstand the top loose strata

• Continuous rain, rise in ground water level immediately below the guide wall due to the heavy rain, higher than thepoly-mud level

• Vibration due to chiselling

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Diaphragm Wall Trench Collapse- P147

Impact-1) Progress hamper for other panels2) Plan for mitigation

Mitigation-1. Bund making over the guide wall and Keeping poly-mud level always

higher than the GW level2. Equal quantity of crusher dust was stoked for immediate risk mitigation.

Immediate risk response-Collapsed trench filled with M5 grade concrete

Bund

Risk factor-Likelihood- 0.25Potential impact- Time- 1 week delay, Cost- Rs 14 Lacs

Risk cost= 14 Lacs x 0.25= 3.5 LacsRisk Time= 1 week x 0.25= 0.25 Week

Post Risk Analysis-

1. Volume losses due to water ingress from the joint locations

2. Under cut/ Over cut while grabbing of D-Wall Panels

3. Honey comb formation due to underwater concreting

4. Chances of soil collapse while concreting affecting quality of concrete

5. Improper fixing of Water bars at joints

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Cavity formation at base level of P101 and 102

Impact-1) Sink hole formation on road2) Dangerous occurrence3) Ingress of water and slush inside station

Immediate risk response-Traffic diversionBackfilling near affected areaSink hole filled with concrete40mm Plate laid over top surface of road

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Risk factor-Likelihood- 0.25Potential impact- Time- 4 week delay, Cost- Rs 44 LacsRisk cost= 44 Lacs x 0.25= 11 LacsRisk Time= 4 weeks x 0.25= 1 Week

Mitigation-1. Installation of bore-well adjacent to the affected D-Walls2. Lowering the water table with the help of installed bore wells3. Excavating inside the station box near the affected panel up to a depth of 1m4. Steel plate fixing at the affected location5. Micro-concrete grout in the affected panels.

Action taken-

1. Contiguous pile 2. Provision of grouting column around the Contiguous pile

Risk Assessment Matrix

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Innovations in Method of Constructions

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Utility Diversion

Inter displacement and interchange of Utility diversion Methodology to expedite Diaphragm wall Construction for streamlining with the planned programme.Training of one team to take off the diversion works internally to reduce the contractor dependency risk

Provision of a new opening at Roof for carrying excavation without strutsElimination of struts at Base level by modified design for D-Walls

By making bund over the guide wallKeeping the poly-mud level always higher than the ground water level

Installation of bore-well adjacent to the affected D-Walls and lowering water table to reduce the ingress of water and micro-concrete at 1m at intervals as a control measure to avoid the risk of sink hole

Excavation Sequence

Soil Collapse in D-Walls

D-Wall Cavity formation

Conclusion and Learnings:-

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