Influences of different directional unloadings upon displacements and internal forces of retaining structure for foundation pit

YIN De-shun; WANG Bao-tian; ZHANG Wen-hui2

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Influences of different directional unloadings upon displacements and internal forces of retaining structure for foundation pit

更新时间：2026-06-25

- Influences of different directional unloadings upon displacements and internal forces of retaining structure for foundation pit
- Vol. 29, Issue 6, (2008)
- 作者机构：
  
  1. 河海大学工程力学系,南京,210098
  2. 河海大学岩土工程研究所,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU470
- Online First：15 July 2013，
  
  Published：2008
- 稿件说明：
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YIN De-shun, WANG Bao-tian, ZHANG Wen-hui2. Influences of different directional unloadings upon displacements and internal forces of retaining structure for foundation pit[J]. 2008, 29(6).
DOI：

YIN De-shun, WANG Bao-tian, ZHANG Wen-hui2. Influences of different directional unloadings upon displacements and internal forces of retaining structure for foundation pit[J]. 2008, 29(6). DOI：

摘要

基坑的开挖是一个水平和竖向压力同时卸载过程；为了研究不同方向卸载对基坑支护位移内力的影响，通过修正的邓肯－张模型模量公式，分别考虑只有水平和竖向卸载情况，对某基坑开挖进行了有限元模拟，发现水平卸载是产生水平位移的主要因素；与考虑水平卸载相比，只考虑竖向卸载时能够使支护产生负内力。通过分析，对支护结构上的实测内力总是小于设计值的原因作出了解释。

Abstract

The excavation of foundation pit involves both horizontal and vertical unloading processes. In order to investigate influence of each directional unloading on displacement and internal pressure of the retaining structure

a foundation pit is analyzed via the FEM simulation of the corresponding modified Duncan-Chang model

under respective unloading of horizontal or vertical pressure. It is shown that the horizontal displacement of retaining structure is largely caused by the horizontal unloading; while the vertical unloading is responsible for the negative internal force. Consequently

this study provides an explanation about the often-observed fact that measured internal pressure in the field is always lower than the one expected in the design.

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