桩板结构路桥过渡段的动力学仿真分析研究  

Analysis and Study of Dynamic Simulation of the Road-bridge Transition Segment with Pile-plate Structure

作　　者：秦旗[1] QIN Qi(China Railway First Survey and Design Institute Group Co.Ltd,Xi’an,Shaanxi 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2021年第12期40-44,49,共6页Journal of Railway Engineering Society

基　　金：中国铁路总公司科技研究开发计划项目(2010G003-F)。

摘　　要：研究目的:在西宝高铁项目路基设计过程中多处采用了埋入式桩板结构,为了判定其与桥梁连接处的过渡段的实际工程表现,对这些过渡段进行动力学仿真模拟计算,并将计算结果与一般传统过渡段进行对比分析。希望这种过渡段设计和仿真计算的方法能为今后的高铁路桥过渡段设计工作提供借鉴和参考。研究结论:(1)桩板结构过渡段的车体竖向振动加速度、轮轨竖向力、车轮减载率、基床竖向位移和基床表面应力在动力响应过程中均处于较低水平的平稳变化,没有出现过大的突变,具有更好的稳定性;(2)桩板结构过渡段无论是对列车行驶的安全性、乘客感受的舒适性,还是对路基本体结构的作用等方面都有显著的积极效果;(3)动力学特性仿真计算这种方法对于桩板结构过渡段在设计前期的性能评判有很高的可靠性,可为高速铁路路基过渡段设计方案的选择提供借鉴和参考。Research purposes:In the subgrade design process of the Xi'an-Baoji high-speed railway project,embedded pile-plate structure was adopted in many places.In order to judge the actual engineering performance of the transition segment between the pile-plate structure and the bridge,the dynamic simulation of these transition segments was carried out,and the results were compared with the traditional transition segment.It is hoped that the design and simulation method of this transition segment can provide reference for the future design of high speed railway bridge transition segment.Research conclusions:(1)The vertical vibration acceleration of vehicle,the vertical force between wheel and rail,the wheel load reduction rate,the vertical displacement and the surface stress of subgrade are all at a lower level in the dynamic response process,and there is no excessive mutation,which has better stability.(2)The transition segment of the pile-plate structure,whether it is the safety of the train driving or the comfort of the passengers,or the role of the subgrade body structure,has significant positive effects.(3)The dynamic simulation method has high reliability for the performance evaluation of pile-plate structure transition segment in the early stage of design,which can be used as the basis for the design of high-speed railway subgrade transition segment.

关 键 词：桩板结构 耦合动力学 有限元仿真 过渡段 高速铁路 

分 类 号：U216.41[交通运输工程—道路与铁道工程]