（上海大学土木工程系  200072）
［提要］  对上海市轨道交通6号线Ⅶ标车站基坑工程进行了三维有限元分析与模拟。根据工程实际建立计算模型，并把计算结果和实测数据进行比较，证实了考虑围护结构和土体共同作用的有限元分析是合理的。具体分析了影响墙体和土体变形的因素，计算结果表明，围护结构的刚度、土体的参数对墙体水平变形有很大影响，温差较大时在围护结构上产生的附加变形和支撑次应力不容忽视。
［关键词］  深基坑  三维有限元  影响因素  温差
3D FEM Imitation and Analysis of Deep Foundation Pit Excavating/Liu Jingxue, Chen Youliang, Chen Jianliang (Department of Civil Engineering, Shanghai University, Shanghai 200072, China)
Abstract:The threedimensional displacement field of the station foundation pit in Shanghai track traffic line 6 project is computed by finite element method. The numerical model is set up and the calculating results are compared with the measured ones.The comparison result has proved that the FEM considering the interaction between supporting structure and soil is feasible.The influencing factors of deformation of diaphragm wall and soils are analyzed. The results show that the stiffness of the supporting structure, deformation modulus and Poisson's ratio have great effects on the deformation of the wall, and the additional deformation and the support secondary stress should be paid great emphases for great temperature difference.
Keywords:deep foundation pit; 3D finite element method; influence factors; temperature difference