摘要
基坑坑底抗隆起稳定安全系数是基坑工程设计的重要指标之一,但在实践中,现有计算方法较难满足工程需要,经常导致基坑设计造价过高。为了推动基坑坑底抗隆起稳定分析方法研究,讨论了经典方法、我国现行规范方法及其规定的安全系数限值所存在的问题,并总结了近年来各类稳定性验算方法在考虑土体强度不均匀性,支护结构嵌固深度、刚度和抗弯强度等影响因素下的改进与发展。常规基坑坑底抗隆起稳定性验算方法并未考虑基坑宽度效应的影响,因此,进一步总结了地铁车站和综合管廊等需要考虑基坑宽度效应的窄基坑抗隆起稳定性的研究进展,主要对基于地基承载力模式和圆弧滑动模式改进的窄基坑坑底隆起破坏模式和稳定性验算方法进行了讨论,以期为基坑坑底抗隆起稳定性验算方法向着科学性、合理性、准确性方向发展提供参考。
The safety factor of basal heave stability of foundation pit is one of the important indicators in the foundation pit engineering design.However,in practice,existing calculation methods are difficult to meet engineering needs,often leading to excessively high costs in foundation pit design.To promote the study of analysis methods for the basal heave stability of foundation pit,the problems in classical methods,current standard methods in China,and the limitation of safety factor were discussed.The improvements and developments of various calculation methods in recent years were summarized,considering factors such as the non-uniformity of soil strength,the embedded depth,stiffness,and bending strength of retaining structures.Conventional methods for calculating the basal heave stability of foundation pit do not consider the effect of the foundation pit width.Therefore,the research progress on the basal heave stability of narrow foundation pit such as subway stations and utility tunnels considering the effect of the foundation pit width was further summarized.The main discussion focuses on the improved failure modes and calculation methods for the basal heave stability of narrow foundation pit based on the bearing capacity mode and slip circle mode,aiming to provide references for the development of calculation methods for basal heave stability of foundation pit towards scientific,reasonable,and accurate directions.
作者
郑刚
甄洁
程雪松
邓旭
宋许根
ZHENG Gang;ZHEN Jie;CHENG Xuesong;DENG Xu;SONG Xugen(Department of Civil Engineering,Tianjin University,Tianjin 300072,China;MOE Key Laboratory of Coast Civil Structure Safety,Tianjin University,Tianjin 300072,China;Department of Civil Engineering,Tianjin Ren’ai College,Tianjin 301636,China;China Railway Siyuan Survey and Design Group Co.,Ltd,Wuhan 430063,China)
出处
《建筑结构》
北大核心
2024年第20期129-142,共14页
Building Structure
基金
国家重点研发计划(2023YFC3009300)
国家自然科学基金项目(52178343)。
关键词
基坑工程
坑底隆起
破坏模式
稳定性验算
窄基坑
foundation pit engineering
basal heave
failure mode
stability calculation
narrow foundation pit
