地铁车站穿越地面建筑物施工方法

Crossing construction methods of subway station under building

以某地铁车站为工程背景,采用1∶20大比例模型试验与数值模拟的方法,对地铁车站采用柱洞法、侧洞法、中洞法3种施工方法穿越地面3层框架结构建筑进行研究.对比分析不同施工方法对围岩及建筑物位移、结构内力、围岩塑性区等的影响.研究结果表明,围岩内部沉降、地表沉降、地表水平位移、建筑物顶部沉降、建筑物柱间沉降差、立柱垂直应力、横梁水平应力、围岩塑性区在采用柱洞法施工时最小,中洞法施工时最大.

A subway station which is under a three-layer frame structural building was taken as an engineering background. The whole construction processes of pioneer heading column construction method, side-tunnel construction method and mid-tunnel construction method were analyzed by 1:20 large scale model tests and numerical simulations in order to find the most appropriate construction method for subway station which was under a three-layer frame structural building. The influences of different construction method on displacement of stratum and building, internal force of structure and plastic zone of surrounding rock were analyzed. The results of model tests and numerical simulations show that the settlement of surrounding rock and ground surface, the horizontal displacement of ground surface, the settlement of building top, the settlement difference between columns, column vertical stress, beam horizontal stress and plastic zone of surrounding rock are the smallest by adopting pioneer heading column construction method, while those are the largest by adopting mid-tunnel construction method.