Study On The Stability Of The Spandrel Groove High Slope Of Jinping Hydroelectric Power Station

Based on the discuss of the geologic environment of the high slope of spandrel groove JinPing I Hydroelectric power station.and the engineering geological conditions of rock mass are carefully studied in the paper. The modified CSMR are adopted to perform the classification of the slope rock mass, the results of which are combined with the macroscopic stability of the high slope. On the basis of these, the methods of geological diagnosis and the finite element analysis are applied to analyze and compute the overall stability of the high slope. The block theory is used to evaluate the local stability of the high slope.The main achievements are obtained as follows in the paper:(1)The deformation fracture of the left bank's hypergene reform is mainly consisted of slipping pressure pull crack slipping flexure slipping pull crack and dumpping pull crack.The right bank,is the slipping pull crack..(2)According to the forming model of the deep pull cracks,they can be divided into three classes pulled cracks-, pressed cracks and sheared cracks.(3)Based on the two-dimensional and three-dimensional finite element methods.the following results can be affirmed:In the slope excavating process,the base surface will rebound in the direction of the excavating surface's excerior normal.the maximal displacements of the left and right bank are +3.6cm and +2.4cm;the arch abutment will rebound in the direction of the river valley,the maximal displacements of the two bank are +3.5cm and +2.2cm;the upstream and downstream surface will rebound in the direction of the normal direction.the maximal displacements are +2.1cm and + 1.7cm.(4)The natural slope is stable. In the excavating process of the left bank,such methods as concrete embolism, consolidation grouting> cable strengthening and bailing shoud be used when the fault f5 is round.On the right bank,the system anchorage and bailing methods shoud be used.It is surgested that the prestressed cable shoud be used to deal with the deterministic blocks.and the prestressed anchor to the undeterministic blocks.