Safety Evaluation and Support of Diversion Tunnel Slope of Hydropower Station

On the basis of analyzing engineering geological conditions inlet slope diversion tunnel on left bank a hydropower station in Jinsha River, overall three-dimensional generalized model is established according to and topographic data during construction period. According excavation support scheme, displacement, stress, strength reserve safety factor after all are calculated simulated under existing such as water storage condition, sudden drop level condition transient (rainstorm). The reduction method used calculate rainfall, impoundment level, failure mode instability predicted analyzed. calculation results can provide reference for protection with multiple schemes.