常州地铁车站基坑地下连续墙不同接头型式分析

Different mechanical modes of diaphragm wall joints for foundation pit of subway station in Changzhou

基于常州地铁2号线怀德站基坑工程地下连续墙的设计,利用ABAQUS数值模拟软件,研究了不同接头型式作用下的地下连续墙接头位置的水平位移变化以及接头型式对地下连续墙、支护体系受力变形的影响规律。研究结果表明:接头处的最大水平位移多发生在基坑开挖的上部,据此可以指导工程设计与安全防控,避免接头位置的位移变形过大及大面积渗漏水情况的发生;较柔性接头而言,刚性接头与地下连续墙整体性更好,可以增强围护结构抵抗侧向变形的能力,降低支护体系受力,提升围护结构的稳定性。研究结果可为常州地铁车站基坑工程设计中接头型式的选用提供一定的参考。

For the design of diaphragm wall of Changzhou metro line No.1 of foundation pit project at Huaide Station,the horizontal displacement response to different mechanical joint modes and the influences of the joint types on the stress of diaphragm wall and support system are studied through ABAQUS simulation.The results show that the maximum horizontal displacement of the joint is most likely to happen at the upper part of excavation surface of foundation pit,leading to a better guidance to prevent the joints from over-large deformation and large-area seepage.Compared with the relative flexible joint,the rigid joint is more compatible with diaphragm wall,and it can increase resistance of retaining structures to resist deformation and to reduce stress of the support system and increase stability of retaining structures.The results can be as reference for choosing the right joint mode for foundation pit project of subway station in Changzhou.