深基坑开挖对邻近市政隧道影响研究

Research on Influence of Deep Foundation Pit Excavation on Adjacent Municipal Tunnels

为研究深基坑开挖对邻近市政隧道的影响,文中依托南京地铁9号线某深基坑工程,采用数值方法对邻近隧道变形作了分析,并基于荷载结构法对隧道结构进行了验算。结果表明:隧道三向位移及路面沉降较小,变形满足规范控制指标;在附加内力作用下,隧道配筋方案符合要求,结构裂缝宽度小于0.2mm,满足承载能力和正常使用要求。该项目的成功实施验证了工程方案的合理性,研究结果可为类似工程提供参考。

In order to study the impact of deep foundation pit excavation on adjacent municipal tunnels,the numerical method was used to analyze the deformation of adjacent tunnels based on a deep foundation pit project of Nanjing Metro Line 9,and the tunnel structure was checked based on the load structure method.The results show that the three-dimensional displacement and pavement settlement of the tunnel are small,and the deformation meets the criterion control index;Under the action of additional internal forces,the tunnel reinforcement scheme meets the requirements,and the crack width of the structure is less than 0.2 mm,which meets the requirements of bearing capacity and normal use.The successful implementation of this project has verified the rationality of the engineering scheme,and the research results can provide reference for similar projects.