基于承载能力极限状态的复合地基破坏模式分析  

Failure modes of composite ground at ultimate limit state

作　　者：徐光黎[1] 陈胜[1] 王建军[1] 赵新益[2] 曾长贤[2] XU Guangli;CHEN Sheng;WANG Jianjun;ZHAO Xinyi;ZENG Changxian(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《武汉大学学报（工学版）》2018年第10期881-887,894,共8页Engineering Journal of Wuhan University

基　　金：国家自然科学基金资助项目(编号:41072218);铁道部科技研究开发计划课题(编号:2012G014-H)

摘　　要：通过广泛的资料收集和分析,基于室内模型试验、离心机实验和大型原位试验结果,系统地分析了复合地基的各种破坏模式.根据增强体、桩间土和复合地基的相互关系和破坏范围,提出将复合地基破坏分为内部稳定性破坏、外部稳定性破坏和整体稳定性破坏等三大类型.内部稳定性破坏包括压缩/鼓胀破坏、剪切破坏和屈曲破坏;外部稳定性破坏包括滑动破坏、倾倒破坏和承载力不足破坏;整体稳定性破坏包括加固体、下卧层、周围的天然地基和基础在内的整体圆弧剪切破坏.并指出：目前的规范仅对剪切破坏和承载力进行校核是不够的,有必要对复合地基压缩/鼓胀破坏、倾倒破坏和屈曲破坏作出设计校核.Based on the results of laboratory model test,centrifuge test and large scale in-situ load test,the failure modes of composite ground are comprehensively investigated.Three categories,i.e.internal stability,external stability and overall stability,are assumed for the stability analysis of composite ground according to failure mechanism among the improved column,soil and embankment and failure area.The internal failure modes include bulging,general shear and bending.The external failure modes include sliding,tilting and weak bearing capacity.Overall stability failure mode is a general circular slip intersecting the column,soil and embankment.It is suggested that it is necessary to check thetilting and bending failure modes in the coming limit state design code because it is not enough to only examine the shear failure and bearing capacity in the existing technical codes.

关 键 词：极限状态设计 复合地基 破坏模式 外部稳定性 屈曲破坏 

分 类 号：TU472[建筑科学—结构工程]