高速公路桩板结构下穿既有高铁桥梁对桥梁变形的影响分析

Influence Analysis of Expressway Pile-plate Structure under Existing High-speed Rail Bridge on Bridge Deformation

高速公路下穿既有高铁桥梁在施工及运营过程中会引起地层土体扰动,进而对铁路产生附加应力,使其发生附加变形。基于此,以广西灌阳至平乐高速公路桩板结构下穿既有贵广高铁为研究背景,利用有限元软件midas GTS NX建立数值仿真模型,分析了桩板结构施工各阶段及高铁运营过程中铁路桥墩和轨道的变形情况。结果表明,采用桩板结构下穿贵广高铁在施工、运营过程中引起铁路桥墩、轨道各个方向的变形位移均满足规范要求。

During the construction and operation of existing high-speed rail bridges under the expressway,it will cause disturbance of the soil in the formation,which will cause additional stress on the railway and then cause deformation.Based on this,taking the Guanyang to Pingle Expressway in Guangxi as the research background,the finite element software midas GTS NX was used to establish the numerical simulation model to analyze the deformation of railway piers and tracks in each stage of pile-plate structure construction and in the process of high-speed railway operation.The results show that the deformation and displacement of railway piers and tracks in all directions caused by the pile plate structure under the Guiguang high-speed railway meet the requirements of the specification during construction and operation.