软土地层顶管复合工法地铁车站抗震性能分析

Aseismic Analysis of Subway Station with Combined Pipe Jacking Method in Soft Soils

文章运用有限元分析软件ABAQUS建立了软土地区两端框架-中间顶管的复合工法地铁车站的三维数值模型,开展了抗震性能分析,根据该车站不同工法结构之间存在的刚度突变特点,对比分析了中间顶管与两端框架结构之间的刚性连接、柔性连接及设置变形缝3种形式的车站结构各个关键连接断面的内力响应。结果表明:相比于刚性连接,采用柔性连接时,除了联络通道与顶管连接处的横向弯矩外,其余连接断面的内力均有显著的提高;而设置变形缝时,对联络通道与顶管连接处的影响较小,对顶管与车站接头处,环向剪力与横向弯矩有较大的提高,而其余内力则明显减小。

In this paper,a three-dimensional numerical model is built to perform the aseismic analysis of a subway station with a jacking pipe in the middle and two frame structures at both ends in soft soils by using the finite element analysis software ABAQUS.According to the feature of abrupt stiffness between structures constructed by different methods,the internal force responses of key sections of the station structure is analyzed for three types of connections between the jacking pipe and the frame structures such as the rigid connection,the flexible connection and the setting of deformation joint.The results show that compared with the rigid connection,when the flexible connection is used,the internal forces of most sections are significantly increased besides the transverse bending moment between the connecting passage and the jacking pipe.When the deformation joint is set,the influence on the internal forces between the connection passage and the jacking pipe is smaller.The circumferential shear and the transverse bending moment between the jacking pipe and the frame structures are greatly increased,while the other internal forces are obviously reduced.