基于强度折减法的边坡滑动破坏分析

Slope Slide-Failure Analysis Based on Strength Reduction Method

本文基于强度折减有限元法进行了边坡滑动破坏形式研究。通过选取不同的边坡土体粘聚力、内摩擦角,对边坡稳定进行了分析,结果表明坡顶与潜在滑移面塑性区中心的垂直距离随粘聚力增大而增大,边坡滑动破坏形式由浅层破坏转变为深层破坏,而内摩擦角对边坡破坏形式以及滑动块的影响规律恰好相反。采用有限元法模拟了土工袋表面加固边坡,结果表明边坡采用表面加固时,加固厚度超过一定值才能起增大边坡安全性的作用,加固后边坡潜在滑移面塑性区后移,往边坡深处发展。

In this paper,the failure form of slope is analyzed for different soil cohesion and internal friction,based on Strength Reduction FEM. The results of analysis on sliding blocks show that: the vertical distance between the slope top and the center of the potential sliding plastic zone increases as the soil cohesion increases,and the sliding failure form changes from shallow destruction to deep destruction. But the effect of the internal friction is opposite compared with the soil cohesion. Then the FEM simulation of the slope surface reinforcement design by piling up sand bags is carried out. The results show that: the reinforcement will work when the thickness of piling up sand bags is beyond a certain value; and when the reinforcement thickness reaches a certain value,the potential sliding plastic zone will develop along deeper soil of the slope.