大型地下环路工程基坑施工对既有地铁隧道的影响

Study on the influence of foundation pit construction of large underground loop road project on existing subway tunnels

以武汉市某地下环路工程上跨既有地铁隧道为背景,就基坑施工对既有隧道的影响程度进行分级,利用有限元分析软件Midas/GTS对该环路基坑施工引起既有隧道变形进行数值模拟。结果表明,该地下环路工程基坑施工引起其上跨的两条既有地铁隧道产生了不同程度的隆起变形,变形值尚在运营地铁隧道变形控制范围内,并对该基坑施工提出了相应的变形控制措施。

Based on the background of an underground loop road project in Wuhan above-crossing the existing subway tunnels,this paper firstly classified the impact of foundation pit construction on the existing tunnels,and then used the finite element analysis software Midas/GTS to simulate the deformation of the existing tunnels caused by the loop road foundation pit construction.The results show that the construction of the foundation pit of the underground loop road project has caused different degrees of uplift deformation of the two existing subway tunnels above-crossed by it.The deformation value is still within the deformation control range of the operating subway tunnels,and corresponding deformation control measures for the foundation pit construction is put forward.