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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
General Presentation<br />
LOCATION : Sikkim<br />
RIVER : Teesta<br />
TECHNICAL FEATURES :<br />
- Concrete Gravity Dam, 9.5 m dia, 17.78<br />
km long Head Race Tunnel.<br />
- Height of dam from deepest = 96m<br />
- Length of crest dam = 183m<br />
HYDRO POWER GENERATION<br />
Underground power house<br />
- Capacity 510 MW (3 x 170 MW)<br />
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INDIA - <strong>TEESTA</strong> <strong>DAM</strong><br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Cutoff<br />
GENERAL SCOPE OF WORKS<br />
- 2 Cofferdams Upstream / Downstream to protect<br />
the Dam pit from the monsoon floods<br />
- Construction of a cut-off below each cofferdam<br />
GROUND CONDITIONS<br />
Permeable bouldary material encountered down to 50m deep<br />
Bedrock mainly composed of quartzo - phyllite ( 70 - 120<br />
Mpa )<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Cut - off wall / Permeation<br />
grouting<br />
<strong>TEESTA</strong> <strong>DAM</strong> PROJECT<br />
UPSTREAM COFFER <strong>DAM</strong>(NHPC)<br />
CUT-OFF ELEVATION<br />
LEFT BANK<br />
1<br />
RIGHT BANK<br />
A<br />
A1<br />
TOP OF JET GROUT CUT-OFF EL:539.00<br />
A2<br />
WORKING PLATFORM<br />
EL:540.00<br />
B<br />
DDH06<br />
A3<br />
A4<br />
<strong>TEESTA</strong> RIVER<br />
A5<br />
A6<br />
A7<br />
DDH07<br />
base of the clay core<br />
subject to NHPC<br />
dierctive<br />
LEGEND:<br />
ROCK PROFILE<br />
25/10/2002<br />
NOTE<br />
Rock fissure grouting below the jet grout cut-off wall:<br />
To be decided by the Engineer after the Lugeon tests to be<br />
carried out below the cut-off wall<br />
NOTE<br />
A1 - A7 : EXPLORATORY HOLES<br />
DDH06 - DDH07 : PREVIOUS GEOLOGICAL INVESTIGATION HOLES<br />
(EXPLORATORY HOLES)<br />
802503 -<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Cut - off wall / Permeation<br />
grouting<br />
RIGHT BANK<br />
<strong>TEESTA</strong> <strong>DAM</strong> PROJECT<br />
DOWNSTREAM COFFER <strong>DAM</strong><br />
CUT-OFF ELEVATION<br />
(solution 2) angular cut-off<br />
TYPICAL PIEZOMETRICAL LINE<br />
LEFT BANK<br />
1<br />
2<br />
WORKING PLATFORM<br />
EL: 543.00<br />
FALL = 1.5%<br />
WORKING PLATFORM<br />
EL: 544.00<br />
B<br />
TOP OF JET GROUT CUT-OFF EL:539<br />
C<br />
D<br />
E<br />
A<br />
WORKING PLATFORM<br />
EL: 535.00<br />
D4<br />
D3<br />
<strong>TEESTA</strong> RIVER<br />
TOP OF JET GROUT CUT-OFF<br />
EL:534<br />
D1<br />
D2<br />
DDH09<br />
D1A<br />
LEGEND:<br />
ROCK PROFILE<br />
(EXPLORATORY HOLES)<br />
AREA OF JET GROUT CUT-OFF WALL: 2797 m²<br />
ROAD SAVED WITH THIS "ANGULAR" SOLUTION<br />
NOTE<br />
D1A- D4 : EXPLORATORY HOLES<br />
DDH09 : PREVIOUS GEOLOGICAL INVESTIGATION HOLE<br />
DIMENSION A to B = 58.77m<br />
DIMENSION B to C = 39.23m<br />
DIMENSION C to D = 33.75m<br />
DIMENSION D to E = 9.89m<br />
TOTAL LENGTH = 141.64 m<br />
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<strong>TEESTA</strong> <strong>DAM</strong> (Works Site)<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Cut - off wall / Permeation<br />
grouting<br />
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INDIA - <strong>TEESTA</strong> <strong>DAM</strong><br />
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INDIA - <strong>TEESTA</strong> <strong>DAM</strong><br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
JET - GROUTING WORKS<br />
= PRE - DRILLING + JETTING<br />
- 7000 m2<br />
- Maximum depth = 70m<br />
- Diameter of columns = 120cm to 260cm<br />
- Average deviation = 1,5 %<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
PERMEATION GROUTING<br />
Systematic complementary treatment<br />
- 1 line at 1.2m spacing<br />
- Systematic first phase of grouting BC + Gel<br />
- Final phase based on the following factors :<br />
- results of the first phase<br />
- deviation and diameter of the jet<br />
columns<br />
- deviation of the grout holes<br />
- mapping of the boulders<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
ROCK GROUTING<br />
- Rock permeability to be investigated<br />
- Grouting with stable mix Bentonite / Cement to be<br />
performed according to the investigation<br />
SPECIFIED SEEPAGE CRITERIA<br />
Global specified permeability of the cut - off wall<br />
K = 1 x 10 -6 m/s<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
B<br />
D DH07<br />
EXISTING HAUL<br />
A5<br />
A6<br />
A7<br />
D DH06<br />
A4<br />
INTAKE<br />
A3<br />
A2<br />
A1<br />
A<br />
B<br />
N<br />
<strong>TEESTA</strong> <strong>DAM</strong> PROJECT<br />
UPSTREAM COFFER <strong>DAM</strong><br />
PLAN VIEW<br />
WP<br />
WP<br />
PZ<br />
WP<br />
PZ<br />
WP<br />
PZ<br />
B<br />
WP<br />
PZ<br />
ROAD MIN. EL:555<br />
PZ<br />
PZ<br />
PZ<br />
PZ<br />
PZ<br />
PZ<br />
PZ<br />
PZ<br />
<strong>TEESTA</strong> RIVER<br />
US Plan view<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
<strong>TEESTA</strong> <strong>DAM</strong> PROJECT<br />
UPSTREAM COFFER <strong>DAM</strong><br />
CROSS SECTION 1-1<br />
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<strong>TEESTA</strong> <strong>DAM</strong> PROJECT<br />
DOWNTREAM COFFER <strong>DAM</strong><br />
PLAN VIEW<br />
(solution 2) Angular cut-off<br />
TYPICAL PIEZOMETRICAL LINE<br />
INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
2<br />
1<br />
A<br />
18/37
<strong>TEESTA</strong> <strong>DAM</strong> PROJECT<br />
DOWNTREAM COFFER <strong>DAM</strong><br />
(solution 2)<br />
INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Jet - grouted cut - off wall /<br />
Permeation grouting<br />
CROSS SECTION 1-1<br />
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INDIA - <strong>TEESTA</strong> Upstream Cofferdam<br />
20/37
INDIA - <strong>TEESTA</strong> <strong>DAM</strong><br />
Plot Test Site<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Shaft in plot test<br />
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INDIA - <strong>TEESTA</strong> - Double Jet air+grout used<br />
Single jet ( HP grout )<br />
Double jet (HP grout<br />
ENCAPSULATED by air )<br />
air<br />
HP HP GROUT GROUT<br />
HP HP GROUT GROUT<br />
Double jet ( HP<br />
water + LP grout )<br />
Triple jet (HP water ENCAPSULATED by<br />
air + LP grout )<br />
air<br />
HP HP WATER WATER<br />
HP HP WATER WATER<br />
LP LP GROUT GROUT<br />
LP LP GROUT GROUT<br />
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INDIA - <strong>TEESTA</strong> <strong>DAM</strong> (Diversion Tunnels)<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Works Site<br />
25/37
INDIA - <strong>TEESTA</strong> <strong>DAM</strong> Works Site<br />
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INDIA - <strong>TEESTA</strong> <strong>DAM</strong><br />
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INDIA - <strong>TEESTA</strong> Secondary Column Diameter<br />
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INDIA - <strong>TEESTA</strong> Upstream Cofferdam<br />
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INDIA - <strong>TEESTA</strong> Upstream Cofferdam<br />
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INDIA - <strong>TEESTA</strong> Downstream Cofferdam<br />
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INDIA - <strong>TEESTA</strong> Average Final Pressures and Volumes<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Image from PICODI<br />
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INDIA<br />
<strong>TEESTA</strong> <strong>DAM</strong><br />
Pumping test<br />
Upstream<br />
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INDIA - <strong>TEESTA</strong> <strong>DAM</strong><br />
Leakage discharge calculation with PLAXIS<br />
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INDIA - <strong>TEESTA</strong> <strong>DAM</strong> (Dam Pit Excavation)<br />
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INDIA - <strong>TEESTA</strong><br />
QUANTITIES<br />
Cutoff walls<br />
Jet grouted columns n°<br />
Grouted holes n°<br />
Drilling<br />
Jet grouted columns<br />
Jet grout volume<br />
Bentonite cement grout<br />
Silicate Gel grout<br />
8500m2<br />
420u<br />
360u<br />
18 000lm<br />
9 300lm<br />
14 500m3<br />
1 100m3<br />
900m3<br />
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