大跨度超小净距暗挖地铁隧道施工方法模拟优化分析

Simulation analysis on construction methods of subsurface excavated subway tunnel with large span and super small interval

以地铁停车区间浅埋暗挖隧道施工为研究对象,采用有限差分专业软件FLAC对九步双侧壁导坑法、六步双侧壁导坑法和CRD法研究围岩及中岩墙位移、应力以及地表沉降等规律。研究结果表明,采用六步双侧壁导坑方法能够达到施工控制要求,可以对原设计进行优化。

With the construction of shallow-buried-excavation tunnel of subway station parking section as the project background,the research studies the regularity about the displacements of surrounding rock and wall of rock in neighborhood tunnel,the stress and surface subsidence and so on with the finite difference professional software FLAC on the six-step double sideway drift method,nine-step double sideway drift method and CRD method.The results indicate that,using the six-step double sideway drift method can meet the demand of the construction control,and optimize the original design