Research on stability of slope at right inlet diversion tunnel of Wudongde Hydropower Station

Based on detailed study on engineering geological conditions, a combined research method of engineering geological analysis evaluation method,limit equilibrium method and numerical calculation method on global is applied to analyse the local stability of the slope at right inlet diversion tunnel of Wudongde Hydropower Station. The results show that global stability is well, 3D distinct element simulation results show that, artificial slope deformation dominated by a small amount of rebound deformation and deformation characteristics without highlighting. Based on the boundary condition analysis of block may be formed after excavation, block instability mode was proposed. Starting with block stability influencing factors, block stability engineering geological evaluation standards has been established. Block stability was evaluated by these standard, 3D rigid limit equilibrium method was used to analyze the stability of the potential failure block in inlet slope, results show that most block was basically stable. Based on global and local stability research result, reinforcement measures were put forward for the slope.