水布垭水电站马崖高边坡稳定性分析

Stability analysis of Maya high side slope at Shuibuya hydropower station

水布垭马崖高边坡地质结构复杂,是坝址区自然稳定状况最差的高陡边坡,在正面坡与西侧坡的转折地带选取一典型剖面,该坡段3面临空,危岩体与卸荷裂隙极为发育。通过采用二维有限元和极限平衡方法对典型部位边坡的天然状态、削坡减载及泄洪冲刷3种工况下的变形、应力状态及其安全系数进行计算及分析,对马崖高边坡在天然状态下与工程荷载作用下的稳定性进行了评价。

The Maya high slope at the Shuibuya hydropower station, with its complicated geological structure, was the worst high slope in the dam site zone in means of its natural stability condition. A typical crosssection was selected in the shift zone between the front slope and the west slope. Three sides of the slope section were of air face, and its dangerous took bodies and rock fissures due to unloading were extremely developed. 2 - D FEM and limit equilibrium method were used to calculate and analyze the deformation and stress states and the safety factors of the typical slope for three operating modes of natural condition, unloading by slope cutting and bank slope scouring due to flood release. The stability of the Maya high slope was evaluated for the natural condition and the additional load condition.