既有运营地铁车站底板下分段分步暗挖法施工技术

The key technology for construction by section and by stage using subsurface excavation method under existing subway station floor

以某市地铁换乘车站为研究对象,论述了该换乘节点分段分步暗挖法施工的开挖工序及支护措施,并运用MIDAS/Gen建立三维数值模型,获得不同开挖工况下结构的内力与位移,结果表明采用该工法施工,结构的内力及位移均满足规范要求。

Taking a subway transfer station as the research object, the paper detailed the excavation procedure and supporting measures for the construction of interchange joint by section and by stage using subsurface excavation method. At the same time, using MIDAS/Gen establish three-dimensional numerical model in order to obtain the internal force and displacement of the structure under different excavation conditions. The results show that the internal force and displacement of the structure meet the specification requirements.