高速铁路新型过渡段结构沉降及动力响应分析  

Analysis on Structural Settlement and Dynamic Response of Light Transition Section of High-speed Railway

作　　者：高乐 GAO Le(China Railway Design Corporation,Tianjin 300142,China)

机构地区：[1]中国铁路设计集团有限公司,天津300142

出　　处：《路基工程》2025年第2期142-147,共6页Subgrade Engineering

基　　金：中国铁路设计集团有限公司科技开发课题:新型土建结构研究(2021B240605);中国国家铁路集团有限公司科技研究开发计划:京津冀铁路装配式U型槽结构协同设计建造关键技术研究(N2022G064)。

摘　　要：针对路堤和涵洞交界处易出现的轨道不平顺问题,提出新型过渡段——刚度-沉降双优化过渡段结构,采用Plaxis 3D研究新型过渡段静动力荷载下的工程性能,分析过渡段类型、列车速度对高速铁路路桥过渡段受力和变形特性的影响规律。结果表明:在路基位置上,列车速度越低,沉降量越大;列车速度对过渡段附近差异沉降影响较大;在过渡段,由于回填材料的刚度呈现过渡,不同列车速度对应沉降曲线的“S形”会发生变化;新型+新型的沉降量最小,新型+旧型的沉降量次之,旧型+旧型的沉降量最大,且两个位置有叠加耦合的影响;当设计速度超过300 km/h时,可适当加长路涵过渡段长度。Aiming at the problem of track irregularity at the junction of embankment and culvert,a structure of new transition section“stiffness-settlement double optimized transition section”was proposed.Plaxis 3D was adopted to study the engineering performance of the new transition section under static and dynamic loads,and then analyze the influence of transition section type and train speed on the stress and deformation characteristics of high-speed railway bridge transition section.The result shows that,in the subgrade position,the lower the train speed,the greater the settlement;the train speed has a great influence on the differential settlement near the transition section.In the transition zone where the transition of the stiffness of the backfill material exits,the'S'shape of the settlement curve corresponding to different train speeds will change;the settlement of the new+new type is the minimum,the settlement of the new+old type is the second,and the settlement of the old+old type is the maximum,and the two positions have the influence of superimposed coupling.When the design speed exceeds 300 km/h,the length of the transition section of the road culvert can be appropriately extended.

关 键 词：路基工程 过渡段 沉降 动力响应 有限元分析 

分 类 号：U213.3[交通运输工程—道路与铁道工程]