Experimental researches on unloading resilient deformation properties during excavations in Shanghai area

LI De-ning; LOU Xiao-ming; YANG Min

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Experimental researches on unloading resilient deformation properties during excavations in Shanghai area

更新时间：2026-06-25

- Experimental researches on unloading resilient deformation properties during excavations in Shanghai area
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  1. 同济大学地下建筑与工程系,上海,200092
  2. 同济大学岩土及地下工程教育部重点实验室,上海,200092
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU447
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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LI De-ning, LOU Xiao-ming, YANG Min. Experimental researches on unloading resilient deformation properties during excavations in Shanghai area[J]. 2011, 32(S2).
DOI：

LI De-ning, LOU Xiao-ming, YANG Min. Experimental researches on unloading resilient deformation properties during excavations in Shanghai area[J]. 2011, 32(S2). DOI：

摘要

通过对上海地区某基坑工程坑底不同深度土样进行一系列K0固结不排水三轴卸荷试验，对上海地区不同深度土层随基坑开挖卸荷变形性状进行研究。研究不同深度的不同土层在两种典型卸荷应力路径下的变形特性，分析了回弹率及回弹模量与卸荷比的变化关系。结果表明，软土的初始卸荷模量Ei及最大回弹率不仅取决于土层性质，还与所经历的不同卸荷应力路径、预压最大荷载等有关，且不同卸荷路径下土体发生强回弹变形的极限卸荷比亦不同

Abstract

To get the unloading deformation properties of soft ground during excavations in Shanghai area

a series of K0 consolidation and undrained triaxial unloading tests have been carried out to study the unloading deformation properties of soil samples at different bottom depths of a deep excavation in Shanghai under two different unloading stress paths. The relationship of the resilience rate and the resilient modulus with the variation of unloading ratio was analyzed. According to the experimental results

the initial modulus and maximum resilience rate depend on soil properties

but also on the different unloading stress paths

pre-consolidation pressure and so on. And the unloading ratio at which strong resilient deformation of soil occurred is not the same under different unloading paths.

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