强度折减法在排桩支护结构稳定性分析中的应用  

The Application of Strength-Reduction Method in Stability Analysis of Row Pile Retaining Structure

作　　者：古海东[1,2] 杨敏[1,2] 孙宽[1,2] 曾英俊 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海城建市政工程(集团)有限公司,上海200065

出　　处：《地下空间与工程学报》2012年第6期1168-1172,1207,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(No.40972179)

摘　　要：排桩支护结构稳定性直接影响到排桩支护结构的正常运行,一直都是排桩支护结构设计中的关键验算项目。运用有限元强度折减法分析排桩支护结构稳定性,通过离心机模型试验验证了该方法的可行性,并针对工程实例与现行《建筑基坑支护技术规程》方法进行了比较分析,对排桩支护结构稳定性及其影响因素进行了较全面的分析。结果表明:采用文中方法得出的排桩间距和排桩截面宽度(或直径)对支护结构稳定性的影响要比《规程》方法大;土体强度参数对支护结构稳定性的影响与《规程》方法的结果基本一致。The whole stability analysis of the row pile retaining structure has always been the key checking computation item in the design of the soil-nailing protection,which directly affects normal work of the row pile protection structure.The stability of row pile retaining structure was analyzed using the strength-reduction FEM method and the feasibility of this method was validated by centrifuge model test.Then,this method was compared with that from current specification through a case study.Based on these,a set of analysis is implemented on the stability of row pile retaining structure and its effecting factors.The results show that the influence of the width and spacing of the row piles on stability of row pile retaining structure is greater than that obtained from the method in the specification.There is a good agreement between the present study and the study of stability of row pile retaining structure influenced by the strength parameters of soil by the specification method.

关 键 词：排桩支护结构 强度折减法 离心机试验 稳定性分析 

分 类 号：U213.1[交通运输工程—道路与铁道工程]