Analytical solutions of calculating length of retaining structures of foundation pit under asymmetric excavation

XU Chang-jie; YIN Ming; HU Wen-tao

doi:10.16285/j.rsm.2017.08.019

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Analytical solutions of calculating length of retaining structures of foundation pit under asymmetric excavation

更新时间：2026-06-25

- Analytical solutions of calculating length of retaining structures of foundation pit under asymmetric excavation
- Vol. 38, Issue 8, Pages: 2306-2312(2017)
- 作者机构：
  
  1. 浙江大学滨海和城市岩土工程研究中心,浙江,杭州,310058
  2. 华东交通大学土木建筑学院,江西,南昌,330013
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.08.019
  CLC： TU470
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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XU Chang-jie, YIN Ming, HU Wen-tao. Analytical solutions of calculating length of retaining structures of foundation pit under asymmetric excavation[J]. 2017, 38(8): 2306-2312.
DOI：

XU Chang-jie, YIN Ming, HU Wen-tao. Analytical solutions of calculating length of retaining structures of foundation pit under asymmetric excavation[J]. 2017, 38(8): 2306-2312. DOI： 10.16285/j.rsm.2017.08.019.

摘要

随着城市建设发展的需要，有两种甚至多种开挖深度的深基坑越来越常见，但设计时常按开挖较深侧单边设计，忽略两侧开挖深度不同带来的影响。基于等值梁法，通过改进开挖较浅侧围护结构所受土压力模式，推导了能考虑两侧挖深不同的支撑式围护结构深度计算公式，探讨了基坑开挖的非对称程度对围护结构插入比的影响。结果表明，相比于仅按单边设计，挖深较深侧对挖深较浅侧的推挤作用会使挖深较浅侧围护结构插入比增大，增大的幅度随非对称开挖程度的增加而增大，且挖深较深侧挖深越大，增大效应越显著。工程实例表明，综合考虑两侧挖深差异的影响，比仅按挖深较深侧单边设计更加经济、合理。

Abstract

As the increasingly harsh conditions of deep excavation in urban area

two or more different depths of excavation in one foundation pit are becoming more common. Ignoring the influences caused by two different asymmetric excavations

traditional method to solve this problem is simplifying the asymmetric excavation as symmetrical and using the deeper side in calculation. Given that

analytical solutions for the length of retaining structures in foundation pit considering the influences caused by two different asymmetric excavations have been deduced using the equivalent beam method. The influences on differences between retaining structures on two sides and their insertion ratio caused by two different asymmetric excavations have been investigated. The results show that

considering two different asymmetric excavations

insertion ratio of retaining structures located on the side of pit with shallower depth increases compared with calculating results without considering two different asymmetric excavation. This enhancing effect of insertion ratio becomes more obvious as the depth of deeper side of the excavation increases. Finally

a case study proved that the analytical solutions can improve the asymmetric excavation pit design method

and provide a useful and economic reference.

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