摘要
采用强度折减法有限元方法(SSRFEM),分析了不排水条件下软土地基中内撑式排桩支护基坑开挖的抗隆起稳定性,并研究了软土不排水抗剪强度、支护结构条件、基坑尺寸对基底抗隆起的影响。研究表明,以往通常采用的极限平衡公式,对基坑开挖基底抗隆起稳定分析不能完全考虑支护结构的影响,也不能考虑基坑侧壁位移的影响,在一些条件下误差较大,而SSRFEM分析方法是求解基坑极限状态实际而自然的破坏形式,可很好地分析基底隆起稳定性。
Finite element method with reduced shear strength （SSRFEM） was used to evaluated the base stability of excavations in soft clays under the undrained condition. The influence of clay undrained shear strength, conditions of pit bracing system and pit dimensions on base upheave stability of excavations were studied detailedly. The results from several limit equilibrium analysis methods for evaluating base stability of excavations were compared with the results from FEM. It shows SSRFEM is a reliable and robust method for assessing the safety factor of the base stability of excavations and limit equilibrium analysis methods only can be used on some conditions.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第2期365-369,共5页
Rock and Soil Mechanics
基金
中国博士后科学基金(No.2002031204)
福建省青年科技人才专项资金项目(No.2002J015)
关键词
基坑开挖
隆起稳定性
有限元分析
安全系数
稳定系数
软土
excavation
base stability of excavation
finite element analysis
safety factor
stability number
soft clay
