Upload
others
View
9
Download
0
Embed Size (px)
Citation preview
1
PRAVIN KOLHE,
(Mobile No. 8806999777)
Superintending Engineer, Water Resources Department, Government of Maharashtra
About Temghar Dam
Leakages & reasons
Remedial Measures
Short Term – Grouting / Shotcrete
Long Term – Concrete Backing
Learnings
2
3
4 Temghar Dam
Mutha River (Krishna Basin)
• 40km from Pune
• Purpose: Drinking + 1K ICA
• Capacity =3.71 TMC (105Mm3)L=1075m
H=86mConstruction Year = 1997 to 2001
27 Monoliths, Central Spillway = 72m
Dam Foot PH = 4MW
L section of Temghar Dam
5
Tender I
M. No. 1 to 13
Tender II
M. No. 14 to 17Tender III
M. No. 18 to 27
6
The reduction in leakage in the year 2012 was observed due to the grouting carried out in the year 2011.
From 2013 again leakage increased year by year and reached to 2587 LPS in 2016
7
Leakage
in LPS
Year
508 526 602
307 402 415
1174
2587
0
500
1000
1500
2000
2500
3000
2009 2010 2011 2012 2013 2014 2015 2016
8
9
Temghar Dam Expert Committee (TDEC) Chairmanship of Shri. V.M.Ranade (Retired Secretary)
Formation 27/8/2014
Scope: to study the problem of seepage from the dam and to recommend remedial measures to minimize it and to ensure safety of the dam.
Proposed Remedial measures Short Term remedial measures
Long Term remedial measures
10
Grouting
VPD Cleaning
Curtain Grouting in Foundation
Monolith Joint Treatment
Shotcrete to U/S Surface
11
D/S Concrete Backing
12
13
14
Dam Top to IG
IG to FG
U/S Face
D/S Face
3 Stages:
-Primary
-Secondary
-Tertiary
Drilling Holes as per Grouting Pattern
Water Intake Test
Grout Mix Design -Empirical
Double Drum Mixer – Colloidal State
Apply Grout
Tests & Records
15
• Proportion of Ingredients:
Cement, Flyash, Silica,
Admixtures, water
• Mixing procedure to get a
colloidal mix
• QC Tests Norms &
Frequency
Cement: Fly
Ash: SilicaW/C Ratio
Admixture (% by wt. of
cementatious material)
Avg. Comp.
Strength
(Kg/cm2)
Density
gm/cc
Marsh
Cone Time
(sec)
Settle
ment
Pow
der
Sup
er
pla
stic
izer
Acc
ele
rato
r
7 d
ays
28
days
80:18:2 0.65 2%5 ml per kg of
cementatious material107 222 1.8 27 to 36
Less
than
5%
16
Sr. No. Test
Results More than Frequency
As per CWPRS
guidance
As per
observations at siteAs per EM 1110-2-3506 As per actual at site
1Marsh Cone Test
(Flowability) 27 to 36 sec 28 to 35 Once per day
One per every 2 hrs per
mixer
2Settlement Test
(Colloidal State)< 5% 2 to 3 % Once per week
One per every 2 hrs per
mixer
3pH
(Alkaline)11 to 13 11 to13 --
One per every 2 hrs per
mixer
4 Compressive Strength 222 kg/cm2 More than 250
kg/cm2
At the time of mix
designOne per day per mixer
5 Density 1.8 gm/ccMore than 1.8
gm/cc
--One per day per mixer
17
18
19
20
Chiselling & Surface Cleaning
Fixing Wire Mesh & Anchors
Apply 1st
Layer 50 mm
Apply 2nd
Layer 50 mm
21
Sr.
No.
Test Pannel / Mold size Method of filling Frequency Range
1 Slump -- As per standard practice Per batch Less than or
equal to 100mm
2 Crushing strength 100mm x100mm
x100mm
Manually with tamping Per batch 7days ≥ 60 kg/cm2
28 days ≥100kg/cm2
45 to 90 days ≥ 150kg/cm2
3 Core test pannel 600x600x150 By Nozzle Per Monolith
4 Early Strength, Partial-beam
Compression Test
150x100x100 Manually with tamping Per Monolith vary in the range 2.5 kg/cm2 to
25 kg/cm2
5 Split Tensile Strength
Test
150x300 By Nozzle Per Monolith 10% of the Crushing Strength
6 Permeability Test 150X100 Manually with tamping Per Monolith coefficeint of permeability should
be less then 2.5 x 10 -8 mm/s
7 Bond test 150X100 Manually with tamping Per Monolith
22
23
24
0.00100.00200.00300.00400.00500.00600.00700.00800.00900.00
1000.001100.001200.001300.001400.001500.001600.001700.001800.001900.002000.002100.002200.002300.002400.002500.002600.002700.002800.00
668 670 672 674 676 678 680 682 684 686 688 690 692 694 696 698 700 702 704 706 708 710
Leakage2016
Leakage2017
Leakage2018
2587
LPS
1039
LPS
413.8
LPS 265.8
LPS
Leaka
ge in
LPS
Water level in m
25
26
27
28
29
श्री.हुद्दार एस.एन. सचिव (सेवाननवतृ्त), जलसपंदा ववभाग अध्यक्षश्री. रा. वा. पानसे सचिव (सेवाननवतृ्त), जलसपंदा ववभाग सदस्य
मखु्य अभभयंता(जस)ं,जलसपंदा ववभाग,पुणे सदस्यमखु्य अभभयंता (स्थापत्य), जलववद्युत प्रकल्प व गुणननयंत्रण, पुणे सदस्य
श्री.प्रमोद नारायण Director, DRIP, CWC सदस्यश्री. ई.स.िौधरी मखु्य अभभयंता (सेवाननवतृ्त), जलसपंदा ववभाग सदस्यश्री.ररझवान अली शास्त्रज्ञ – डी, कें द्रीय जल व ववद्युत अनुसधंान ससं्था, पुणे सदस्य
अधीक्षक अभभयंता, (धरण) मध्यवती सकंल्पचित्र सघंटना, नाभशक सदस्यअधीक्षक अभभयंता, धरण सरुक्षक्षतता सघंटना, नाभशक. सदस्य
श्री. स.ुवव. प्रदक्षक्षणे अधीक्षक अभभयंता, गोदावरी पाटबंधारे मडंळ, औरंगाबाद सदस्यअधीक्षक अभभयंता, पुणे पाटबंधारे प्रकल्प मडंळ, पुणे सदस्यकाययकारी अभभयंता, भामा आसखेड धरण ववभाग, पुणे सदस्य
सचिव
30
अ) समितीची कार्यकक्षा To review the progress of leakage prevention remedial works and
strengthening of Temghar dam.
To take technical decisions regarding implementation of remedial work.
Assess efficacy of remedial measures.
Discuss the consultant monthly report and reports of quality control organization and suggest measures for improvements in quality of work.
Committee will meet twice a year if necessary it will meet more than 2 times in year as per necessity of work at site.
ब) कालावधी : धरणाचे गळती प्रततबंधक काि व िजबुतीकरणाचे काि पूणयहोईपर्तं.
झालेल्र्ा बैठका: ९ (प्रत्रे्की २ दिवस कालवधी)
31
Mix Design for Grout & Specifications
Mix Design of Shotcrete and & Specifications
QC Tests and Norms
Practical approach for resolving technical issues
faced at site.
Density Tests
32
WRD Monitoring by JE to CE level.
Guidance in Mix Design
Norms for QC Test
3rd Party QC Durocrete
Monitoring of activities independently
Guidance in Best Practices
Advanced Tests
33
34
Potential Hazard is huge for dams
If quality compromised at construction stage, itcannot be restored.
Technical challenge to bring structure in safeconditions
Team work – PoE, CWPRS, QC, 3rd Party WC,Contractor and Field Staff (Integration of withinand Outside Dept experts)
PoE कार्यकक्षा – To Take Decisions
35
IS/International Standards are not “िगडावरची रेष”. क्षेत्रीर्स्तरावरील गरजेनुसार तज्ञ संस्थेकडून R&D करून Grouting /Shotcrete चे Specifications modify करणे आवश्र्क
For Grouting, if mixer is kept at dam top and grouting iscarried out at dam foot, then pressure head developed in thepipe shall be taken into account.
Repair is not only technical matter: In case of Temghar it isAdmin, Financial, Legal, Disciplinary & criminal matter.
Face Media and try to bring good side in public
Moral Support of highest authorities including Secretary, ED,CE is most crucial.
PRAVIN KOLHE, Superintending Engineer, Water Resources Department, Government of Maharashtra
email: [email protected] Mob: +91-8806 999 77736