各向异性软土基坑抗隆起稳定极限平衡分析

doi:10.16285/j.rsm.2018.1861

岩土力学 ›› 2019, Vol. 40 ›› Issue (12): 4848-4856.doi: 10.16285/j.rsm.2018.1861

各向异性软土基坑抗隆起稳定极限平衡分析

周建^{1, 2}，蔡露^{1, 3}，罗凌晖^{1, 2}，应宏伟^{1, 2}

1. 浙江大学滨海和城市岩土工程研究中心，浙江杭州 310058；2. 浙江大学浙江省城市地下空间开发工程技术研究中心，浙江杭州 310058； 3. 苏州常宏建筑设计研究院有限公司姑苏分公司，江苏苏州 215000

收稿日期:2018-10-08 出版日期:2019-12-11 发布日期:2020-01-04
作者简介:周建，女，1970年生，教授，主要从事软黏土力学、软土地基处理、非饱和土本构模型等方面的研究工作。
基金资助:
2016国家重点研发计划课题（No.2016YFC0800203）；国家自然科学基金重点项目（No.51338009）

Limit equilibrium analysis of anisotropic soft clay stability against excavation basal heave

ZHOU Jian^{1, 2}, CAI Lu^{1, 3}, LUO Ling-hui^{1, 2}, YING Hong-wei^{1, 2}

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou, Zhejiang 310058, China; 3. Suzhou Changhong Architectural Design and Research Institute Co., Ltd., Gusu Branch, Suzhou, Jiangsu 215000, China

Received:2018-10-08 Online:2019-12-11 Published:2020-01-04
Supported by:
This work was supported by 2016 National Key R&D Program(2016YFC0800203) and the Key Project of National Natural Science Foundation of China(51338009).

摘要/Abstract

摘要： 土体的各向异性与沉积环境和应力历史密切相关。以能够考虑土体特性的各向异性不排水抗剪强度公式为基础，利用圆弧滑动方法，并考虑破坏面上强度的折减（），推导各向异性软土基坑抗隆起稳定极限平衡解。对软土基坑抗隆起稳定进行研究，系统分析了开挖深度H、围护结构插入深度D、最下道支撑与坑底相对距离He/H等几何因素及土体有效内摩擦角、各向异性强度比k及强度沿深度非均质变化的斜率等强度参数的影响。最后结合工程实例，验证了公式的适用性，为软土基坑工程抗隆起分析提供了新的思路。

关键词: 软土, 不排水抗剪强度, 各向异性强度比, 圆弧滑动方法, 大主应力轴方向角

Abstract: The anisotropic properties of soft clays are closely related to the sedimentary environment and stress history. Based on a theoretical formula of anisotropic undrained shear strength which take soft clay characteristics into account, this paper analyzes the soft clay stability against basal heave with slip circle method with consideration of strength reduction on the failure surface. The considered strength reduction formula can be expressed as , which means shear strength on the failure surface equals to the undrained shear strength times the cosine value of effective internal friction angle. Stability against basal heave of excavation is studied. Based on a number of examples, the influences of geometrical factors such as the excavation depth H, embedded depth D, and relative distance of the lowest support to the pit bottom He/H are analyzed. Strength factors such as the effective internal friction angle , anisotropic strength ratio k and slope of heterogeneous shear strength versus depth are also investigated. Finally, the applicability of the formula is verified by the engineering example. This paper provides a new idea for the stability analysis against excavation basal heave.

Key words: sofy clay, undrained shear strength, the anisotropy strength ratio, the arc sliding method, principal stress axis angle

中图分类号:

TU447

周建, 蔡露, 罗凌晖, 应宏伟, . 各向异性软土基坑抗隆起稳定极限平衡分析[J]. 岩土力学, 2019, 40(12): 4848-4856.

ZHOU Jian, CAI Lu, LUO Ling-hui, YING Hong-wei, . Limit equilibrium analysis of anisotropic soft clay stability against excavation basal heave[J]. Rock and Soil Mechanics, 2019, 40(12): 4848-4856.

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各向异性软土基坑抗隆起稳定极限平衡分析

Limit equilibrium analysis of anisotropic soft clay stability against excavation basal heave

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