锦屏I级水电站地下厂房施工期围岩变形开裂特征及地质力学机制研究

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Abstract Jinping I Hydropower Station located in the Southwest China is a key cascade and control underground hydropower project at the Yalong River. The project is very huge and the underground powerhouse system is very complicated，as well as the complex geological conditions，lower strength for rock relative to very high geostress especially. The challenge which no found in historical projects is presented by two dominate aspects in the construction. The two ones are stability and reinforce of surrounding rock. The characteristics of deformation split of surrounding rock and failure of supporting structure is described based on the geological conditions，monitor and geophysical prospecting，investigations in-situ and tests data. The correlations are discussed which deformation failure of surrounding rock and supporting structure with geostress，rock mass structure and mechanical property of rock under loading and unloading. The geomechanics mechanism of deformation failure of the surrounding rock and supporting structure is explained. The tangential loading stress is rather large and inclined to split pressed at downstream side(especially hance) of main powerhouse and main transformer house，but the normal unloading stress is rather larger and inclined to tension and relaxation unloaded because of the high geostress and its direction. The rheological behaviour of the fracture surrounding rock is presented，and is gradually charactered from surface to deep，the time-dependent deformation of fracture rock mass with surrounding rock relaxation is showed. The surrounding rock at downstream side is easy to bend and break-off and low susceptibility to shear and slide of main powerhouse and main transformer house under secondary stress field，because that the upstream side is bedding but the downstream inverse slope with low dip angles. The powerhouse marble is presented that relative lower strength，heavy brittle and lower strain strength，easy to tension pressed under unloading.

Key words： hydraulic engineering Jinping I hydropower station underground cavern group deformation split geomechanics mechanism high geostress

Received: 22 June 2010

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http://www.rockmech.org/EN/Y2011/V30/I1/23

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