紧邻建筑物的浅埋隧道开挖施工方案仿真分析

以重庆轻轨6号线小什字车站区间隧道为例,利用FLAC3D软件建立了由建筑物造成的浅埋偏压隧道计算模型；运用有限差分数值方法对三种不同开挖施工方案进行了数值仿真,得出了浅埋、偏压隧道围岩的地层变形与塑性区的分布受开挖施工先后顺序影响较大.研究结果表明,采用CD法开挖小什字浅埋偏压隧道,首先开挖右导坑是不适宜的；实际施工采...

Simulation on Different Excavation Construction of the Shallow-buried Tunnel Adjacent to Buildings

Xiaoshizi transit tunnel of urban light-rail line 6 in Chongqing is taken as an example to establish a calculation model for shallow-buried bias tunnel construction adjacent to buildings by FLAC3D numerical simulation;using finite difference numerical method for three different excavation schemes in the numerical simulation,it is obtained that the stratum deformation and distribution of plastic zone of the surrounding rock of shallow-buried bias tunnel is much affected by the construction sequence.The result of the study shows that the tentative excavation of the right line tunnel first is not appropriate,meanwhile,in actual construction,the left pilot tunnel was excavated first and its surface subsidence and plastic zone was well controlled.In addition,the monitoring data and the result of numerical simulation are in good agreement.The study not only offers reference to reasonable and effective design scheme but also provides safe and reliable construction measure for similar project.