深基坑开挖三维弹塑性有限元分析  

3-dimension Elastic-Plastic Finite Element Analysis of the Deep Foundation Pit Excavation

作　　者：赵利益[1,2] 蔡伟铭[1,2] 

机构地区：[1]上海铁道大学勘察设计研究院 [2]同济大学地下建筑与工程系

出　　处：《上海铁道大学学报》1997年第4期100-105,共6页

摘　　要：对深基坑开挖时支护结构及周围土体的位移、应力等进行了三维有限元分析。其中，土体用修正剑桥模型模拟，支护结构按弹性考虑。推导了修正剑桥模型的增量型本构关系及空间等参元的计算格式；采用了新的开挖荷载计算方法，并在ＡＤＩＮＡ程序的基础上编制了一个能模拟实际开挖全过程的空间有限元分析程序；利用所编程序进行了工程实例计算及结果分析。理论计算与实测的位移、应力值比较吻合。This paper deals with the displacement and stress of the supporting structure and surrounding soil in deep foundation pit excavation, in which elastic-plastic model (the revised Cam-clay model)is used for soil and elastic model for supporting structure. The increment type constitutive equation of the Cam-clay model and the calculation precedure of 3-dimension isoparametic element are deduced. The new method of predicting loading during excavation is used in this paper. Consequently, according to the ADINA program, a finite element analysis procedure able to simulate all the stages during construction of practical excavation is programmed. Then the calculation of engineering example and the analysis of results using this procedure is carried out, and it is found that the theoretical resolutions are in good agreement with the observed displacement and stress. 

关 键 词：深基坑 有限元分析 弹塑性分析 开挖 支护结构 

分 类 号：TU432[建筑科学—岩土工程] TU753[建筑科学—土工工程]