Stability Analysis of Diversion Tunnel Inlet Slope at Right Bank of Jinchuan Hydropower Station

Based on the research of formation lithology, geological structure, deformation failure mechanism ,rock-mass quality and mechanics parameters of the diversion tunnel inlet slope at the right bank of Jinchuan Hydropower Station, a numerical three-dimensional geological model of slope and structural surface was established by applying 3D modeling program, and combined with the slope excavation design, cuttings of transverse and axial direction are conducted, thus, the structural surface location and the rock-block combination are obtained in the excavation face and excavation process. And then, the stability of deterministic block body is calculated by using commercial rock-slope stability-calculation program. By using the probability analysis method in analysis of dominant structure plane combination, possible random combination block of the rock can be get, and then, the block stability calculation is carried out. The results show that deterministic blocks and random combination blocks have good stability under all kinds of working conditions.