支护结构入土深度对黏土基坑抗隆起稳定的影响分析

黄茂松; 杜佐龙; 宋春霞

支护结构入土深度对黏土基坑抗隆起稳定的影响分析 English Version

黄茂松^1,2,
杜佐龙^1,3,
宋春霞^1,2

（ 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;3.中国建筑第八工程局有限公司技术中心，上海200120 ）

基金项目: 国家杰出青年科学基金项目（50825803）;上海市优秀学科带头人计划项目（09XD1403900）

详细信息

作者简介:
黄茂松(1965– )，男，教授，博士生导师，从事岩土工程的科研和教学工作。

中图分类号: TU470
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出版历程
- 收稿日期: 2010-05-05
- 发布日期: 2011-07-14

Effects of inserted depth of wall penetrationon basal stabilityof foundation pits in clay

(1. Department of Geotechnical Engineering,Tongji University ,Shanghai 200092, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3.Technology Center ,China Construction Eighth Engineering Division,Shanghai 200120, China)

摘要

摘要: 在考虑支护结构入土深度影响的情况下，传统的基于Prandtl机构的上限解过高地估计了黏土基坑的抗隆起稳定安全系数，因而无法真正应用于工程实践中。首先采用强度折减弹塑性有限元法和多块体上限法对支护结构入土深度的影响进行了深入的分析，在此基础上对Prandtl机构进行了修正，并推导了符合极限分析上限定理的修正机构简化解;通过对比分析验证了所推导公式的合理性，此公式对工程中常见的软土层厚度较大时基坑抗隆起稳定分析具有重要的实用意义。
- 基坑抗隆起稳定 /
- 黏土 /
- 强度折减有限元法 /
- 修正Prandtl机构 /
- 上限解
Abstract: The upper bound solution based on the classical Prandtl mechanism usually overestimates the safety factor of basal stability of foundation pits considering the effects of inserted depth of wall penetration. The solution is not commonly used in practice. At first, the effects of inserted depth of wall penetration are analyzed by means of the shear strength reduction finite element method (SSRFEM) and multi-block upper bound method. Then, an improved analytical solution based on a modified Prandtl mechanism is given, which obeys the upper bound theorem of plastic limit analysis. Verification of the proposed formula is finally carried out by comparisons between the numerical results from SSRFEM and the multi-block upper bound method. The formula is applicable in practice when a hard stratum is present well below the base of foundation pits, which is a common phenomenon in geotechnical engineering.
- basal stability /
- clay /
- shear strength reduction finite element method /
- modified Prandtl mechanism /
- upper bound solution

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参考文献(14)

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