›› 2008, Vol. 29 ›› Issue (10): 2719-2724.

• 基础理论与实验研究 • 上一篇    下一篇

非均质软土基坑抗隆起稳定性的极限分析方法

秦会来1, 2,黄茂松1, 2,王卫东3   

  1. 1.同济大学 岩土及地下工程教育部重点实验室,上海 200092;2.同济大学 地下建筑与工程系,上海 200092; 3.华东建筑设计研究院有限公司,上海 200002
  • 收稿日期:2006-09-15 出版日期:2008-10-10 发布日期:2013-08-03
  • 作者简介:秦会来,男,1979年生,博士生,主要从事岩土工程极限分析方面的学习与研究。
  • 基金资助:

    上海市重大科技攻关项目子课题(No. 04dz12001)

Limit analysis method for basal stability of braced excavation against upheaval in heterogeneous soft clay

QIN Hui-lai1, 2, HUANG Mao-song1, 2, WANG Wei-dong3   

  1. 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. East China Architectural Design and Research Institute Co., Ltd., Shanghai 200002, China
  • Received:2006-09-15 Online:2008-10-10 Published:2013-08-03

摘要: 考虑到实际工程中土体非均质以及软土地区基坑开挖过程中土体稳定性的特点,将极限分析上限方法应用于非均质软土基坑抗隆起稳定分析计算中,讨论了极限分析方法的适用性问题。选用Prandtl机构建立了非均质软土地区基坑抗隆起稳定分析的运动许可速度场,根据速度场推导了极限分析上限方法的计算公式。讨论了该方法中土体强度、基坑宽度、支护墙体入土深度、基岩埋置深度等因素对坑底抗隆起稳定的影响。通过几个工程的计算与对比,验证了该方法的适用性和优越性。

关键词: 极限分析上限法, 软土, 基坑支护, 抗隆起稳定性

Abstract: The hetergeneity of soil is a common phenomenon in geotechnical engineering. In view of the characteristic of the soil stability during excavation in soft clay, an upper-bound limit analysis method is used to solve the problem of basal stability in heterogeneous soft soil. The applicability of the upper-bound method is discussed to ensure that it obeys the requirements of the limit analysis theorems. Prandtl mode of the bearing capacity of foundation is then adopted to construct a kinematically admissible velocity field for the upper-bound method. Based on the kinematically admissible velocity field, the calculation formulas for the basal stability in heterogeneous soft soil are established. With the proposed formulas, the effect of the soil strength, the width of foundation pit, the depth of retaining wall and the location of the hard stratum on the stability coefficient are discussed. The basal stability of several cases is studied and the calculated safety factors are compared with those obtained by other methods. The comparison demonstrates the applicability of the upper-bound method used in this paper.

Key words: upper-bound theorem of limit analysis, soft clay, braced excavation, basal stability against upheaval

中图分类号: 

  • TU 432
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