地震作用下的边坡稳定性分析

Study on slope stability under earthquake

以高新沙水库水利工程右岸边坡为研究对象,基于大型有限元软件ADINA建立了该边坡的二维有限元仿真模型。以塑性区贯通为失稳判别标准,分别采用强度折减法和地震超载法对边坡的动力稳定性进行了研究。研究结果表明:当边坡塑性区贯通坡顶时,该边坡的强度折减系数和地震超载倍数分别为1.88和3.2,因此可以判定该边坡的折减安全系数和超载安全系数分别为1.88和3.2;地震超载法计算出的边坡塑性区范围要大于强度折减法计算出的塑性区范围。

This paper takes the right bank slope of a domestic water conservancy project as a research object,and establishes a two-dimensional finite element simulation model of the slope based on large-scale finite element software ADINA.Taking the penetration of the plastic zone as the criterion for determining instability,the strength reduction method and seismic overload method were used to study the dynamic stability of the slope.The research results show that when the slope plastic area penetrates the top of the slope,the strength reduction factor and seismic overload factor of the slope are 1.88 and 3.2 respectively,so it can be judged that the reduction safety factor and overload safety factor of the slope are 1.88 And 3.2;the range of the plastic zone of the slope calculated by the seismic overload method islarger than the range of the plastic zone calculated by the strength reduction method.