基于极限平衡的边坡稳定分析  

A Study of Slop Stability Analysis Based on Limit Equilibrium Method

作　　者：匡林 贺梓宸 范立 

机构地区：[1]重庆市市政设计研究院,重庆400020

出　　处：《中国市政工程》2015年第2期64-67,121-122,共4页China Municipal Engineering

摘　　要：利用有限元法求坡体处于弹性状态时此面上的应力场,计算出此面上的法向应力和切向应力分布,由切向应力求出坡体的滑动力,再由法向应力和Mohr-Coulomb破坏准则求出此面达到极限平衡状态时所能提供的抗滑力,得出坡体的安全系数。通过算例发现,该方法分析边坡稳定是可行的,所获得的坡体安全系数比强度折减法和重度增加法均要小。通过分析不同参数对计算的影响发现,弹性模量E、泊松比μ对分析精度影响较小,黏聚力c、内摩擦角对计算精度影响较大,计算参数的改变对重度增加法的计算结果影响最大,对强度折减法和有限元极限平衡法影响相对较小。The finite element method is used to analyze the stress field of the surface when the slope is in the elastic state. The normal and tangential stresses along the sliding surface can beobtained respectively, and the sliding force can be given according to the tangential stress, and then, the slide resistant force can be given according failure criteria as the sliding surface is in the limit equilibrium state, and fi nally, the safety factor of the slope can be obtained. The results of the numerical example indicate that this method is feasible for analyzing the slope stability and the safety factor calculated by this method is smaller than those by the strength reduction method and the gravity increase method. For different parameters, the results indicate that elastic modulus E, poisson ratio μ affect less on the accuracy of analysis and cohesion c, internal friction affects greater on the accuracy of analysis, the different parameters affects greater on the gravity increase method more than the strength reduction method and the finite element limit equilibrium method.

关 键 词：边坡稳定 强度折减法 重度增加法 有限元极限平衡法 安全系数 

分 类 号：TU413.62[建筑科学—岩土工程]