基坑开挖对邻近地铁隧道变形的影响分析

摘要

当地铁隧道距离基坑较近时，基坑施工会对地铁隧道的围岩应力进行重分布，并引发隧道结构产生变形及内力变化，甚至影响隧道的正常运行。文章应用三维数值分析的手段，对基坑施工过程进行三维动态模拟分析，并结合现场实际监测数据，分析基坑开挖对邻近矿山法地铁隧道的影响。分析表明，基坑施工会使邻近矿山法地铁隧道结构产生变形，但变形量非常微小，不会影响到地铁隧道的结构安全性。其现场实测数据与有限元分析结果对比反映了隧道变形的规律，可以为以后的工程提供参考。%When the distance of a subway tunnel excavation is close , rock stress of subway tunnel will be re-distributed , and trigger the deformation and internal force changes of tunnel structure .Three-dimensional nu-merical analysis was carried out on the foundation pit construction process in this paper , which reflected the effect of adjacent metro tunnel range change on the construction of foundation , combining with the actual moni-toring data , then we analyzed the influence of the excavation of adjacent mining method on subway tunnel .It is proved that foundation pit construction does have an effect on adjacent mining method of deformation and stress distribution of the subway tunnel structure , but it is very small , not enough to affect its safety .The field test da-ta and finite element analysis results reflect the Deformation Law of subway tunnel and then provide a reference for the future engineering .