分层地基中隧道开挖对邻近刚性桩筏基础竖向影响分析  

Vertical responses of capped pile foundations to ground movements induced by tunneling

作　　者：木林隆[1,2] 黄茂松[1,2] 王卫东[3] 

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]华东建筑设计研究院,上海200002

出　　处：《岩土工程学报》2011年第7期1082-1090,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家杰出青年科学基金资助项目(50825803);教育部高等学校博士点基金项目(20070247066);上海市科委重点科技项目(08201200902)

摘　　要：基于两阶段分析方法:第一阶段采用Loganathan方法计算隧道开挖引起的土体自由场位移,第二阶段采用层状地基中弹性理论法,计算桩和土,桩和桩之间的相互作用,并考虑刚性筏板对桩基的约束作用,提出了一套能够分析层状地基中隧道开挖对刚性筏板群桩基础竖向影响的解析方法。将计算结果与离心试验结果及现有方法计算结果进行对比,得到了较好的一致性,验证了其正确性。并首次对层状地基中桩筏基础承载特性进行了分析,讨论了桩基变形对遮拦效应的削减作用,结果表明此方法意义明确,层状地基模型更符合工程实际情况,适于推广使用。A simplified method of numerical analysis is developed to estimate the settlement and load distribution of capped pile foundations subjected to ground movements induced by tunneling in layered soil based on a two-stage method.In this method,the Loganathan analytical solution is used to estimate the free-field ground movements induced by tunneling at the first stage.At the second stage,composing the ground movement to the pile,the vertical movements governing equilibrium equations of piles are solved by finite difference method.The interactions between structural members,pile-soil,pile-raft,raft-soil and pile-pile interactions are modeled by means of the method in layered elastic half space though in case study there＇s no need to consider the raft-soil interaction.The validity of the proposed method is verified through comparisons with centrifuge tests,some published solutions for a single pile,pile groups and pile rafts subjected to ground movements induced by tunneling.Good agreements between these solutions are demonstrated.Responses of passive piles in layered soils and reduction of pile-soil interaction by pile deformation are analyzed.

关 键 词：被动桩 隧道开挖 桩筏基础 弹性理论法 层状地基 

分 类 号：TU471[建筑科学—结构工程]