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  Execution of Contact and Consolidation grouting in 162.5m deep, 38m dia Surge Shaft of RHEP-412 MW, HP (India) – A Challenging activity

  Hydro power projects developed in mountainous regions throughout the world envisages construction of underground water conductor system and Surge shafts. In India these are generally constructed by using conventional drilling and blasting methods for excavation. During excavation of cavity, surrounding rock gets disturbed with blasting and there is sometimes cavity/crack formation/opening of joints in the rock mass. These cracks could become source of water loss which may lead to water head loss and even destabilization problems. Cement grouting is generally carried out to avoid such problems in underground structures of hydroelectric projects. In the Surge Shaft (162.5m, 38m finished internal dia) of 412MW Rampur Hydro Electric Project (HP), rock encountered in excavation was phyllitic with highly jointed quartzite. Water loss observed during drilling of holes was quite high and with less lateral rock cover on hill side.

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