The Stability Analysis Of The Fracturing And Deformation Body On The Left Bank Of Jinping I Hydropower Station

Jinping I hydropower station is located in the large Bay of Yalong river, the structures of rock mass on the left bank of the dam site are complex, and the engineering geological conditions are relatively poor, the transformation of the role of shallow surface of the slope is very strong ,and also the slope has many deep cracks, so the slope stability problems is very serious, especially the fracturing and deformation body on the left bank is very prominent. In this paper, the author based on the geological conditions of dam site, make a detailed analysis of the rock structure on the left bank, especially near the fracturing and deformation body has done a detailed analysis. And also make a discussed on the deep cracks on the left bank. The geometry of the fracturing and deformation body was defined, the evaluation deformation and failure mode of the fracturing and deformation body also is defined. At last the paper make a detailed analysis of the deformation characteristics near the geometric border of the body. Based on the detailed analysis of the fracturing and deformation body, such as the engineering geological characteristics and the boundary deformation anslysis, make a 3D numerical simulation on the fracturing and deformation body. The main research results obtained are as follows:1. The natural slope stability problem on the left bank of Jinping I hydropower station includes the upper rock deformation, deformation and shape of pressure-induced deformation and slip-shaped and deep deformation, etc.The slope on the left bank is basically stable in the natural state2. The faults f5 to f42-9, f38-6 development on the left bank slope represented by a series of fault NEE~EW, they play a key role on the control slope deformation. And the fault f42-9 control.the stability of fracturing deformation body3. Numerical Simulation study shows that, the excavation above the 1795m elevation have a certain influence on fracturing deformation body. After exposing the large-scale of the fault f42-9, the region of f42-9 fault displacement more than other regions , local deformation of the slope significantly, but the overall body deformation crack have little deformation.4. In slope excavation process, shear strain of the fracturing deformation body boundary crack (f42-9, X, SL44-1) has a trend growth, the completion of excavation the deformation of shear strain through the entire border.5. The excavation of 1795m following has a little impact on the fracturing deformation body, first, because fracturing deformation body through the three-body shear holes improve the stability , and the other is the lower part of slope excavation rupture deformation is no longer dug up the body of rock anti-skid. Fracturing and deformation body has its own role and the gravity effect caused by unloading, a small amount of deformation may be generated by construction works caused by the adverse effects. Simulation results show that after the unti-sheear holes and support works, fracturing deformation body is overall stability...