地铁安保区桩基施工对临近地铁隧道的影响分析

Impact of the Metro Pile Installation in Tunnel Safety Restriction Zone of the Adjacent Tunnels

随着城市建设的大规模发展,越来越多的工程建设项目位于地铁沿线安保区内,安保区内进行桩基施工会对临近的地铁隧道产生一定的影响。以深圳宝安区某工程为例,采用布辛奈斯克解从理论上计算分析了桩基础施工对地铁隧道产生的附加应力的影响,采用Midas GTS三维有限元模拟、分析了桩基施工对临近地铁隧道的变形影响,采用＂体积等代＂的理论计算分析了管桩沉桩施工挤土效应对地铁隧道的变形影响,其分析计算方法及工程经验可供类似工程参考。

With the large-scale development of the urban construction,more and more engineering projects are in the safety restriction areas along subway lines.This paper presents a case history of the safety evaluation of the impact of the pile installation in the safety restriction zone of the adjacent tunnel on the stability of the existing tunnel in Baoan District of Shenzhen City.The Boussinesq theory was applied to obtain an analytical solution of the effective stress on the existing tunnel.The pile installation induced deformation of the adjacent tunnel was simulated with MIDAS GTS three-dimensional approach.The soil squeeze effect induced by the pile installation on the deformation of the tunnel was also evaluated by the＂equivalent volume＂method.