富水卵砾石地层盾构下穿既有市政隧道影响性分析

Impact analysis of shield tunneling under existing municipal tunnels in the rich water pebble stratum

以杭州市某连接通道预埋工程下穿既有市政隧道工程为背景,利用Midas GTS NX计算软件研究了富水卵砾石地层中,盾构隧道下穿施工对既有明挖市政隧道主体结构的变形影响。计算结果表明,左右线盾构掘进完成后,市政隧道最大水平位移值约为0.2 mm,最大竖向沉降值约为3.95 mm,变形可控。建议加强对市政隧道结构的监测,利用监测结果指导施工,优化施工参数,确保工程顺利实施。

Taking the pre embedded project of a connecting passage in Hangzhou as the background,the deformation effect of shield tunneling on the main structure of the existing open cut municipal tunnel in the rich water gravel layer was studied using Midas GTS NX calculation software.The calculation results show that after the completion of the left and right shield tunneling,the maximum horizontal displacement value of the municipal tunnel is about 0.2 mm,the maximum vertical settlement value is about 3.95 mm,and the deformation is controllable.It should be strengthen the monitoring of municipal tunnel structures,use monitoring results to guide construction,optimize construction parameters,and ensure the smooth implementation of the project.