Numerical simulation of seepage-stress interaction during foundationditch excavation

JI You-jun; LIU Jian-jun; XUE Qiang

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Numerical simulation of seepage-stress interaction during foundationditch excavation

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- Numerical simulation of seepage-stress interaction during foundationditch excavation
- Vol. 28, Issue S1, (2007)
- 作者机构：
  
  1. 武汉工业学院多孔介质力学研究所,武汉,430023
  2. 中国科学院武汉岩土力学研究所,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU470
- Online First：28 March 2014，
  
  Published：2007
- 稿件说明：
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JI You-jun, LIU Jian-jun, XUE Qiang. Numerical simulation of seepage-stress interaction during foundationditch excavation[J]. 2007, 28(S1).
DOI：

JI You-jun, LIU Jian-jun, XUE Qiang. Numerical simulation of seepage-stress interaction during foundationditch excavation[J]. 2007, 28(S1). DOI：

摘要

根据基坑工程施工实际情况，基于地下水渗流的基本规律以及岩土体受力的本构模型，建立了在应力场和渗流场耦合作用下基坑受力的力学模型，通过有限元方法模拟了基坑开挖过程中周围应力场及渗流场的变化规律。计算结果表明：在设置挡土墙并及时排水情况下，随着开挖的进行，基坑周围的土体变形增大，挡土墙前的土体发生沉降，墙体最终发生变形，基坑底部土体向上隆起，在基坑角落处水头梯度较大，发生应力集中，容易导致工程事故，必须谨慎处理。另外，基坑在降水时内外水头差过大将会引起墙体承受过大压力，基坑周围沉降会更大，这样不利于墙体和周围建筑安全。

Abstract

According to the execution situation of the project

the constitutive model of rock and soil and the seepage law of ground water are taken into account

a new mechanics model of the ditch is established

seepage and the stress field of foundation ditch in different working states are simulated by finite element method. Accordingly

some conclusions are drawn: during the process of excavation

deformation of the soil around the ditch occurs

the soil at the bottom of the ditch swells

at the corner

there exists a stress concentration

this point is a vulnerable area

it should be treated with caution. In addition

with the precipitation of the ditch

the deformation of the rock and soil around the ditch will increase gradually

this will affect the safety of the retaining wall and the building near the ditch

therefore

during the construction of the ditch

precipitation should be controlled cautiously.

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