地铁多条盾构区间下穿既有涵洞的三维数值分析

On three-dimension numeric analysis of undercross existing culvert under multiple shield sections of subways

以两条区间盾构隧道,外加一条中间的出入段隧道,下穿既有的盖板涵为例,采用三维有限差分模型,对整个施工过程进行了数值分析,量化探讨了三条平行隧道之间的力学关系以及对既有涵洞的影响,旨在为管片结构设计、盾构机的掘进参数以及其他施工措施的选择提供力学依据。

Taking the undercross existing plate culverts of the shield tunnels between two sections plus the entrance section tunnel in the middle as the example,the paper adopts the three-dimension finite difference models,undertakes the numeric analysis of the whole construction process,and explores the dynamic relationship among three parallel tunnels and their influence on the existing culverts,so as to provide some reference for the pipe segment lining structure design,the jacking parameter of the shield machine,and the selection for the construction measures.