INDIATEESTA DAMJet grouted cut -off wall Permeation grouting

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INDIA TEESTA DAM Jet - grouted cut - off wall / Permeation grouting 1/37 INDIA TEESTA DAM 2/37 INDIA TEESTA DAM 3/37 INDIA TEESTA DAM General Presentation LOCATION : Sikkim RIVER : Teesta TECHNICAL FEATURES : - Concrete Gravity Dam, 9.5 m dia, 17.78 km long Head Race Tunnel. - Height of dam from deepest = 96m - Length of crest dam = 183m HYDRO POWER GENERATION Underground power house - Capacity 510 MW (3 x 170 MW) 4/37 INDIA - TEESTA DAM 5/37 INDIA TEESTA DAM Cutoff GENERAL SCOPE OF WORKS - 2 Cofferdams Upstream / Downstream to protect the Dam pit from the monsoon floods - Construction of a cut-off below each cofferdam GROUND CONDITIONS Permeable bouldary material encountered down to 50m deep Bedrock mainly composed of quartzo - phyllite ( 70 - 120 Mpa ) 6/37 INDIA TEESTA DAM Cut - off wall / Permeation grouting TEESTA DAM PROJECT UPSTREAM COFFER DAM(NHPC) CUT-OFF ELEVATION RIGHT BANK 1 LEFT BANK A1 WORKING PLATFORM EL:540.00 TOP OF JET GROUT CUT-OFF EL:539.00 A B A2 DDH06 A3 A4 TEESTA RIVER A6 A7 DDH07 A5 base of the clay core subject to NHPC dierctive LEGEND: NOTE 25/10/2002 Rock fissure grouting below the jet grout cut-off wall: To be decided by the Engineer after the Lugeon tests to be carried out below the cut-off wall ROCK PROFILE (EXPLORATORY HOLES) NOTE A1 - A7 : EXPLORATORY HOLES DDH06 - DDH07 : PREVIOUS GEOLOGICAL INVESTIGATION HOLES 802503 - 7/37 INDIA TEESTA DAM Cut - off wall / Permeation grouting TEESTA DAM PROJECT DOWNSTREAM COFFER DAM CUT-OFF ELEVATION (solution 2) angular cut-off TYPICAL PIEZOMETRICAL LINE LEFT BANK 2 1 RIGHT BANK WORKING PLATFORM EL: 543.00 B A WORKING PLATFORM EL: 535.00 D4 TEESTA RIVER D3 TOP OF JET GROUT CUT-OFF EL:534 D1 D2 WORKING PLATFORM EL: 544.00 FALL = 1.5 % TOP OF JET GROUT CUT-OFF EL:539 C D E D1A DDH09 LEGEND: ROCK PROFILE (EXPLORATORY HOLES) NOTE D1A- D4 : EXPLORATORY HOLES DDH09 : PREVIOUS GEOLOGICAL INVESTIGATION HOLE AREA OF JET GROUT CUT-OFF WALL: 2797 m² ROAD SAVED WITH THIS "ANGULAR" SOLUTION DIMENSION A to B = 58.77m DIMENSION B to C = 39.23m DIMENSION C to D = 33.75m DIMENSION D to E = 9.89m TOTAL LENGTH = 141.64 m 8/37 TEESTA DAM (Works Site) 9/37 INDIA TEESTA DAM Cut - off wall / Permeation grouting 10/37
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