土工基础

›› 2012, Vol. 26 ›› Issue (5): 82-84.

• 工程实录 • 上一篇    下一篇

有限元边坡稳定安全系数的影响研究

杨宏丽1，王文韬2   

  1. (1.西安长庆科技工程有限责任公司 建筑工程设计部，西安 710018；2.河南省地矿局地质十一队，河南商丘 476000)
  • 收稿日期:2012-07-05 出版日期:2012-10-20 发布日期:2012-10-27
  • 作者简介:杨宏丽(1977-)，女，本科，工程师,2001年7月毕业于青岛建筑工程学院土木工程系建筑工程专业，研究方向为建筑结构设计。

Study on the influence on the factors of safety of slope by finite element method

YANG Hongli1，WANG Wentao2   

  1. （1.Dept. of Architecture Engineering, Xi'an Changqing Technology Engineering Co., Ltd., Xian 710018, China；2.The eleventh geological team of Henan province bureau of geoexploration and mineral development, Shangqiu, 476000)
  • Received:2012-07-05 Online:2012-10-20 Published:2012-10-27

摘要： 在边坡稳定性有限元分析中，常将安全系数定义为沿某一特定滑面的抗滑力与下滑力之比。针对该定义下分析结果表现出来的不合理现象，将纯粘土圆弧滑面边坡解析解与该定义下的数值解进行对比分析，结果表明泊松比对边坡稳定安全系数影响较大，当泊松比接近0.5时，边坡安全系数与解析解完全一致。典型算例分析也验证了这个规律，表明在一般情况下泊松比对该定义下的边坡安全系数也有相同的影响规律。

关键词: 边坡稳定, 强度折减法, 极限平衡法, 安全系数

Abstract: Besides the strength reduction technique in slope stability analysis using Finite Element Method (FEM), another popular FEM method is to define the factor of safety as the ratio of resisting force to the driving force along a proposed slip surface. It is observed that some unreasonable results might be occurred under this definition. This paper compares the analytic solutions on the specified slip surface of a pure clay slope with the FEM results. The results show that the Poisson's Ratio has a great influence on the factors of safety obtained with FEM approach. The factor of safety obtained from the FEM is in consistent with the analytic solution when the Poisson's Ratio is close to 0.5.

Key words: Slope Stability, Strength Reduction Technique, Limit Equilibrium Method, Factor of Safety