地下过街通道工程对既有地铁隧道影响分析

Influence Analysis of Underground Pedestrian Access Projects on the Existing Subway Tunnel Structure

通过对地下过街通道工程施工过程中地铁隧道变形的监测,分析地下过街通道工程对既有地铁隧道的影响。监测结果表明,除距离施工范围较远的Z11、Z12 2点测试值超过报警值以外,其它测试值均小于报警值,地下通道施工对地铁隧道未造成大的影响,地铁隧道结构处于稳定状态;受地下通道施工影响,距离地下通道较近的点竖向位移表现为上浮,水平位移向施工部位位移;从隧道变形及收敛结果以及管片接缝挤压结果来看,施工对其影响较小,隧道变形累积量在2 mm-4 mm,收敛结果在0.18 mm-0.46 mm。

Through the deformation monitoring of subway tunnel in the construction of underground pedestrian access,we analyses the construction of underground pedestrian access impact on subway tunnel.Monitoring results show that,except the value of the monitoring points Z11 and Z12 that far from the construction site exceeded the alarm value,the test values of the other monitoring points are less than the alarm value.The construction of the underground pedestrian access does not have a big impact on the subway tunnel,subway tunnel structure is stable;underground channel close to the floating point performed the vertical displacement by the impacts from underground channel construction,and the horizontal displacement appeared deforming to the construction site;Through the tunnel deformation and convergence results and the segment joints squeeze results,the construction has little impact on subway tunnel structure,tunnel deformation accumulation are in the 2-4mm,convergence results are in 0.18-0.46mm.