Three-Dimensional Limit Equilibrium Stability Analysis of Intake Diversion Tunnel Slope for Maerdang Hydropower Station

In order to solve the stability problem of high-steep slope,based on the statistical principle,three-dimensional limit equilibrium method is used to analyze the stability of random blocks in the intake diversion tunnel slope of Maerdang hydropower station.And then the random blocks of the slope are searched and made a sensitivity analysis of block's height to obtain the safety factors of block in three operating conditions including natural condition,rainstorm condition and earthquake condition.Required anchorage force of dangerous block is obtained by simulating reinforcement of prestressing cable.According to the calculation results,the possible blocks' characteristics,size and stability in intake slope of diversion tunnel are obtained and some suggestions of strengthening dangerous block are put forward,which provides reference value for reinforcement design of practical engineering.