施工荷载对既有高铁隧道群的影响数值分析

Numerical analysis of the influence ofconstruction load on existing high speed railway tunnel group

以某近距离跨越三条高铁隧道群的地铁运用库工程为背景,建立了三维有限元数值模型,分析了桩基和上部结构施工过程中大型施工机械作业所产生施工荷载对既有隧道的影响,得到隧道结构在施工过程中的应力和变形。结果表明,施工荷载使隧道上方土体产生较大变形,既有隧道结构的应力和变形满足安全运营要求。

Taking a proposed metro depot that closely spans a tunnel group comprised of three high speed railway tunnels as the engineering background,this paper developed some 3-D FEM models to analyze the influence on the existing tunnels imposed by the load of large construction machines while constructing the piles and superstructure,and obtain the stress and deformation distribution of the tunnels.It is found that the deformation of the soil above the tunnels induced by the construction load is pretty large,while the worst stress and deformation of the existing tunnels meets the operational safety requirements.