基于强度折减的离散单元法在岩质边坡稳定性分析中的应用

Application of DDA Based on Strength Reduction in Rock Slope Stable Analysis

离散元方法是一种用于非连续介质的数值计算方法,适用于岩体断层、节理、裂隙比较发育的岩质高边坡稳定性分析。强度折减法是一种在边坡稳定性分析中应用比较广泛的数值方法,其所认定的强度储备系数跟极限平衡所提出的稳定安全系数是等效的。将离散元方法与强度折减准则相结合,采用两套离散网格:密网格代表节理裂隙发育的工况;稀网格近似等效为岩体经过加固后完整性得到提高的工况,对构皮滩水垫塘高边坡进行了计算,分析了自然边坡及开挖边坡的稳定性,并对支护效果进行了评价,为工程的设计施工提供了参考。

The discrete element method is a numerical method used in non-continuum. It is suitable for high rock slope contained much more rock faults, joints and cracks to do analysis of stability. The strength reduction method is a numerical method, which is applied in slope analysis of stability extensively. Strength reserve coefficient assessed by strength reduction method is equal to stability safety factor proposed by limit equilibrium method. The discrete element method and strength reduction criterion are combined. Two kinds of grid are used, i.e. dense grids represent the condition of joints and cracks development, and the thin grids are approximately equal to condition which rock integrity has been improved because of reinforcement. The simulation of water cushion pool high rock slope of Goupitan Project is done, the stability of natural slope and excavation slope analyzed, and supporting effect evaluated.