Improving displacement mutation criterion of slope failure in strength reduction finite element method

ZHANG Ai-jun; MO Hai-hong

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Improving displacement mutation criterion of slope failure in strength reduction finite element method

更新时间：2026-06-25

- Improving displacement mutation criterion of slope failure in strength reduction finite element method
- Vol. 34, Issue S2, (2013)
- 作者机构：
  
  1. 广州大学土木工程学院,广州,510006
  2. 华南理工大学土木与交通学院,广州,510641
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU457
- Online First：19 November 2013，
  
  Published：2013
- 稿件说明：
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ZHANG Ai-jun, MO Hai-hong. Improving displacement mutation criterion of slope failure in strength reduction finite element method[J]. 2013, 34(S2).
DOI：

ZHANG Ai-jun, MO Hai-hong. Improving displacement mutation criterion of slope failure in strength reduction finite element method[J]. 2013, 34(S2). DOI：

摘要

采用有限元强度折减法分析边坡稳定性时，计算所得安全系数依赖于所采用的失稳评判标准。目前边坡失稳判据的多样性及其不确定性，使得计算所得安全系数的合理性及其唯一性受到了质疑，因此如何选择或改进一种既能满足工程需要又易于操作的失稳判定准则显得尤为重要。针对某一典型边坡算例分别按计算收敛性、特征部位位移突变性和塑性区贯通性等3 个失稳判据考查判据的合理性及其适用性，对比研究三维与二维数值所得边坡稳定安全系数的差异

然后对位移突变失稳判据进行了一种改进，通过绘制位移突变倍率(当前分析步位移与上一分析步位移之比)跟折减系数的关系曲线来确定边坡安全系数，并通过简化的实例模型证明了其适用性。

Abstract

While the shear strength reduction (SSR) technique based on finite element method is employed to analyze slope stability

the safety factor of slope is dependent on the criteria used for evaluating critical instability condition. Due to the existing variety and uncertainty of the criterion

the rationality and uniqueness of the numerical solution of the safety factor are in doubt; thus

it is especially important to choose an instability criterion

which can not only meet with engineering need but also can facilitate its application. Firstly

a typical example slope is analyzed by using the elastoplastic FEM based on the SSR technique in order to examine the reasonability and applicability of various criteria

such as the abruptness of the displacement

deformation at a certain characteristic location

connectivity of plastic zone. Then

an improved criterion based on the criterion of displacement has been proposed by plotting the curve of displacement multiplying power to shear strength reduction ratio.

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