基于三维数值模拟的土-岩复合边坡稳定性分析

Stability Analysis for Soil-rock Composite Slope Based on Three-dimensional Numerical Simulation

运用有限差分强度折减法对肯斯瓦特水利枢纽工程联合进水口土-岩复合边坡的稳定性进行了模拟分析。模拟结果表明:联合进水口土-岩复合边坡在坡脚和坡面浅表层由于剪应力和局部的拉应力作用发生过微弱的塑性位移,下部白垩系下统呼图壁河组(k1h1)岩质边坡基本上处于弹性变形,上部卵砾石土质边坡形成最危险的滑移面;从演变过程预测,坡顶处第四系中～上更新统(Q2-3al)松散层和第四系上更新统(Q3al)胶结层会出现蠕动滑移和崩塌的危险。模拟结果将对土-岩复合边坡的稳定性控制具有重要的参考作用。

The soil-rock composite slope stability of the joint intake of Kenswat hydro-junction engineering is simulated and analyzed here by using the strength reduction finite-difference method. The simulation results show that faint plastic displacement would occur in the superficial zone of the soil-rock composite slope＇ s feet and face owing to the shear stress and local tension stress. Under the slope, the rock slope of lower cretaceous Hutubi river group （k1h^1 ） would be basical- ly in elastic deformation, and the upper gravel soil slope would form the most dangerous sliding face. From the prediction of evolution process, the unconsolidated layers of the Middle to Upper Pleistocene of Quaternary （Q_3^al） and the glued layer of the Upper Pleistocene of Quaternary （Q_2-3^al3） would cause the creep slip and be in the danger of collapse. The simula- tion results are of an important reference for the stability control of soil-rock composite slope.