摘要
Abstract
In the process of urban metro construction,it is quite frequent that a metro tunnel needs to pass beneath the existing surface structures.This paper,based on actual project and through field monitoring data analysis and other means,carried out research and discuss on the construction scheme of shield tunnel passing beneath the existing surface route of urban metro.The existing urban metro routes are often accompanied more stringent requirement on settlement deformation control of subgrade and track.Because of various restrictions,both the grouting method and the rail-buckling method could not be used in subsoil strengthening of this existing route.For this reason,other reasonable measures were adopted,such as arranging guardrail against derailment,adjusting the parameters of shield tunneling,and regulating the track deformations by increasing or decreasing the ballast during maintenance time and so on,and eventually the track deformations of the existing route were controlled successfully so that the operation safety of the existing route could be ensured.In the research,it was also found that the instability of shield earth pressure was one of the most important reasons which caused the surface subsidence.关键词
盾构隧道/近接施工/监控量测Key words
shield tunnel/ construction adjacent to existing structure/ monitoring and measurement分类
交通工程
