摘要
在分析高承压水地层基坑开挖时基坑底板破坏机理的基础上,利用塑性极限分析中的塑性铰线法提出了一种计算抗承压水基坑底板临界厚度的方法,其优点是能综合考虑基坑底板的几何尺寸、底板土层的破坏强度及破坏形式等因素对底板稳定性的影响。在7个工程实例的计算中,该法与传统基坑底板稳定性分析方法以及数值模拟方法进行了比较,结果表明本文方法明显优于传统的稳定性分析方法,能较真实地反映基坑底板抗隆起的稳定性。
Based on an analysis of the bottom failure mechanism during foundation pit excavation in the soil layer with high artesian water pressure, a method for calculating the critical thickness of the bottom plate is suggested by use of the yield-line method in plastic limit analysis. This method is able to consider influences of the pit dimension, the strength behavior and the failure mechanism of the bottom soil layer on the bottom heave stability. The suggested method and the traditional method are used for analyzing the bottom plate stability of seven foundation pits. The analytic results are compared, and it is shown that the present method is more realistic for evaluating the bottom heave stability than the traditional method.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2009年第8期1236-1241,共6页
Chinese Journal of Geotechnical Engineering
关键词
基坑开挖
底板隆起稳定性
塑性极限分析
承压水
foundation pit excavation
stability of bottom heave
plastic limit analysis
artesian water
