地铁路基桩板结构施工对既有高速铁路路基的影响研究

摘要

针对城市轨道交通与既有高速铁路并行段桩板结构路基施工问题,运用有限元软件Plaxis 3D Tunnel建立三维有限元模型,分析计算了不同桩长、下卧层土体和间距下地铁桩板结构路基施工引起的既有高速铁路路基水平位移及沉降.结果表明:由地铁桩板结构路基施工引起的既有高速铁路路基变形较小,而桩板结构路基填土才是引起其位移的主要因素.%For the problem of pile-plate subgrade construction for urban rail transit parallel with existing highspeed railway,a 3D finite element model is built by finite element software Plaxis 3D Tunnel to analyze and calculate the horizontal displacements and settlements of high-speed railway,resulted from construction of pileplate structure subgrade of the metro,under different pile length,different underlying soil as well as different space between urban rail transit and high-speed railway.The results show that the construction of metro pileplate subgrade cause smaller deformations to the high-speed railway subgrade and the filling of the pile-plate subgrade is the main factor causing the displacement.