Influences of constitutive models on overall stability analysis of deep excavations using strength reduction method

HU An-feng; CHEN Bo-lang; YING Hong-wei

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Influences of constitutive models on overall stability analysis of deep excavations using strength reduction method

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- Influences of constitutive models on overall stability analysis of deep excavations using strength reduction method
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  1. 浙江大学岩土工程研究所,杭州,310058
  2. 浙江大学软弱土与环境土工教育部重点实验室,杭州,310058
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU433
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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HU An-feng, CHEN Bo-lang, YING Hong-wei. Influences of constitutive models on overall stability analysis of deep excavations using strength reduction method[J]. 2011, 32(S2).
DOI：

HU An-feng, CHEN Bo-lang, YING Hong-wei. Influences of constitutive models on overall stability analysis of deep excavations using strength reduction method[J]. 2011, 32(S2). DOI：

摘要

运用有限元强度折减法对基坑工程进行整体稳定性分析时，已有研究主要采用摩尔-库伦模型对土体进行模拟，由于摩尔-库伦模型给出的基坑变形曲线与实测不符，故据此得到的基坑整体稳定安全系数也不甚合理。采用Plaxis硬化模型模拟开挖过程，在强度折减分析中采用特征点位移突变对基坑整体稳定性进行收敛判断，通过分析对比所选取的不同特征点的位移与折减系数的关系曲线，提出采用挡墙内侧开挖面附近土体作为收敛判断的判别点较为合理，其安全系数的取值与采用极限平衡法得到的结果比较接近，而摩尔-库伦模型所得到的计算结果则偏大。最后分析了基坑宽度、基底软土层厚度、挡墙插入深度和挡墙刚度等因素对基坑整体稳定性的影响，并比较了采用这两种不同土体本构模型对分析结果的影响

Abstract

In previous studies

Mohr-Coulomb criterion is mainly used to simulate soil behaviors in the analysis of overall stability of deep excavations using strength reduction method. However

the deformations obtained by numerical method using Mohr-Coulomb criterion can’t coincide with the measured results well

which may lead to an unreasonable safety factor. So Hardening-Soil criterion is introduced to simulate the excavation process using software Plaxis; and the displacement abruptness of characteristic node is used to judge the stability of the pit. By analyzing the relationship between the displacements of different nodes and coefficient of strength parameter reduction

the soil node near excavation surface in front of wall is selected as the reasonable point in convergence judgment. The safety factor obtained using Hardening-Soil criterion agrees well with the result by using the limit equilibrium method. Whereas the safety factor obtained using Mohr-Coulomb criterion is much larger. Finally

the influences of many factors

such as width of pit

thickness of weak soil beneath the base of excavation

depth of embedment and stiffness of retaining wall on overall stability are investigated intensively; and the results obtained by using two different constitutive models are compared

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