高速铁路路基动力响应有限元分析

Finite Element Analysis of Dynamic Response of High-speed Railway Roadbed

根据高速铁路列车对路基结构运行的特点,结合路基结构形式,基于弹塑性本构关系,利用有限元软件MIDAS/GTS,选取模型参数,建立轨道-路基体系的三维有限元计算模型,对轨道和路基动力特性进行研究,分析路基在高速铁路列车振动荷载作用下的变形特性,以及路基动位移和动速度随路基深度变化的动力响应特性,并找出其规律性,对高速铁路路基设计具有重要的指导意义。

According to the high speed railway train to the subgrade structure operation characteristics,combined with the structure of roadbed,based on the elastoplastic constitutive relation,and the finite element analysis software MIDAS/GTS is used,the model parameters are selected.A track-roadbed system of three-dimensional finite element model to study the dynamic characteristics of the track and roadbed is established.In the high-speed train vibration loads,analysis of the deformation characteristics of the roadbed,the subgrade dynamic displacement and dynamic speed dynamic response characteristics with the the subgrade depth of change are analyzed,And the regularity is derived.There are important guiding significance for the design of its high-speed railway roadbed.