有软弱下卧层时地基承载力的可靠度分析  

Reliability Analysis of Foundation Bearing Capacity with Weak Underlying Stratum

作　　者：范文彦[1,2] 卢雪松[1] 

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074 [2]南昌大学建筑工程学院,南昌330031

出　　处：《桂林工学院学报》2010年第1期84-88,共5页Journal of Guilin University of Technology

基　　金：江西省教育厅科学技术研究项目(赣教技字[2007]50)

摘　　要：当地基受力层范围内有软弱下卧层时,对地基承载力进行可靠度分析应该综合考虑地基持力层承载力失效和软弱下卧层承载力失效两种失效模式。基于可靠度理论,通过建立持力层和软弱下卧层承载力的极限状态方程,用JC法分别计算了两种失效模式的可靠指标,然后将两种失效模式视为串联系统,用一个等效的极限状态方程来计算整个串联体系的可靠指标,得到了有软弱下卧层时地基承载力的体系可靠度指标。通过与均值法计算结果的比较,说明可靠度分析方法是合理和必要的。In weak underlying stratum foundation,two kinds of failure modes of bearing stratum and weak underlying stratum are used in the reliability analysis of foundation bearing capacity.Based on the theory of reliability,limit state equations for bearing capacity of bearing stratum and weak underlying stratum are established.JC method is used to calculate reliability index of two failure modes.It is assumed that the two failure modes form a serial system and the reliability index of the serial systems could be computed by an equivalent limit state equation.Compared with average method,reliability analysis method is reasonable and essential.

关 键 词：持力层 软弱下卧层 JC法 串联系统 等效极限状态方程 

分 类 号：TU431[建筑科学—岩土工程]