Test and modulus formula for lateral unloading and loading stress paths during excavation in foundation pit

YIN De-shun; WANG Bao-tian

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Test and modulus formula for lateral unloading and loading stress paths during excavation in foundation pit

更新时间：2026-06-25

- Test and modulus formula for lateral unloading and loading stress paths during excavation in foundation pit
- Vol. 28, Issue 11, (2007)
- 作者机构：
  
  1. 河海大学工程力学系,南京,210098
  2. 河海大学岩土工程科学研究所,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU443
- Online First：18 October 2013，
  
  Published：2007
- 稿件说明：
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YIN De-shun, WANG Bao-tian. Test and modulus formula for lateral unloading and loading stress paths during excavation in foundation pit[J]. 2007, 28(11).
DOI：

YIN De-shun, WANG Bao-tian. Test and modulus formula for lateral unloading and loading stress paths during excavation in foundation pit[J]. 2007, 28(11). DOI：

摘要

分析认为，基坑支护外侧的土体有可能产生侧向卸载和加载两种应力路径，因此进行了侧向卸载、加载的应力路径试验，并根据邓肯-张模型的思路和试验结果，推导了侧向卸载、加载的切线弹性模量公式。通过实例计算发现，用推导的切线弹性模量公式，可以得到很好的计算结果，这说明考虑侧向卸载、加载的应力路径的模量公式能够更好地模拟基坑问题。

Abstract

Based on a preliminary analysis

it is estimated that the soil layer at outer of the retaining structure could produce lateral unloading and loading stress paths. Therefore

a series of tests were performed with different lateral unloading and loading stress paths. Based on Duncan-Chang model and result of experiments

formulas to calculate tangent elastic modulus were developed for lateral unloading and loading conditions. A good agreement was observed between test data and results from finite element analyses using the previously mentioned tangent modulus model. These results show that excavation of foundation pit can be better simulated on condition that lateral unloading and loading stress paths are considered.

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