基于可变组合机构的黏土基坑抗隆起稳定性上限分析

唐震; 黄茂松; 袁聚云

doi:10.11779/CJGE2017S2044

基于可变组合机构的黏土基坑抗隆起稳定性上限分析 English Version

唐震^{1, 2},
黄茂松^1,2, ,,
袁聚云^{1, 2}

1. 同济大学土木工程学院地下建筑与工程系,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

基金项目: 国家重点研发计划课题（2016YFC0800202）

详细信息

作者简介:
唐震(1989- ),男,博士研究生,从事极限分析上限法在岩土工程中的应用研究。E-mail: tangzhen9@126.com。

通讯作者:
黄茂松，E-mail：mshuang@tongji.edu.cn

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出版历程
- 收稿日期: 2017-08-01
- 发布日期: 2017-12-19

Upper bound analysis of basal stability of excavations in clay based on variable combined mechanism

TANG Zhen^{1, 2},
HUANG Mao-song^1,2, ,,
YUAN Ju-yun^{1, 2}

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

摘要

摘要: 基于固定机构的上限法在分析基坑的抗隆起稳定性时,往往会得到偏大的不合理结果。根据上限定理,构造了黏土基坑抗隆起稳定性分析的可变组合机构,可变组合机构通过几何参数的优化得到最优的上限解及相应的破坏机构,并且考虑了强度非均质与各向异性的影响。算例分析表明,所提方法接近于多块体上限法和弹塑性有限元法的结果,并且和传统的固定机构相比具有较大的优越性。
- 基坑抗隆起 /
- 上限法 /
- 破坏机构 /
- 各向异性 /
- 非均质软黏土
Abstract: The traditional failure mechanisms with constant shapes usually overestimate the basal stability of excavations in clay. A new mechanism is established based on the upper bound theorem. The least upper bound solutions and the corresponding failure mechanisms are obtained through the optimizations with geometry parameters. The non-homogeneous and anisotropic undrained shear strengths are considered. The new mechanism is verified through cases studies. The results show that the accuracy of the new mechanism is better than that of the traditional failure mechanism, and the proposed mechanism is close to that obtained from the multi-block upper bound method.
- basal stability /
- upper bound theorem /
- failure mechanism /
- anisotropy /
- non-homogeneity

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参考文献(12)

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