轨道过渡段刚度突变对轨道振动的影响  

Influences of Track Transition on Track Vibration Due to the Abrupt Change of Track Rigidity

作　　者：雷晓燕[1] 

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013

出　　处：《中国铁道科学》2006年第5期42-45,共4页China Railway Science

基　　金：国家自然科学基金资助项目(50268001);江西省自然科学基金资助项目(0450012);江西省主要学科学术和技术带头人培养计划项目(020001)

摘　　要：建立轨道过渡段基础刚度突变的轨道振动微分方程，：睢导单轮作用下轨道变形的解析表达式。利用该解析解和叠加原理，研究轨道刚度突变对轨道振动的影响，分析单轮对和TGV高速列车在3种轨道刚度比时的轨道动力响应。结果表明，轨道刚度突变对轨道振动影响较大，轨道动力响应随着刚度比和列车速度的增加而增加。在理论分析基础上，提出轨道过渡段整治原则：过渡段宜采用分层（3～4层）强化基础刚度的措施；列车在过渡段运行时应满足所引起的动力系数小于或等于1．2及过渡段各层之间的刚度比在0．5～1之间；过渡段每层平缓距离，当列车速度小于或等于160km·h^-1时，取5m，当列车速度大于160km·h^-1时，取10m。Analytical formula of track deflection under a single moving wheel has been derived by establishing the differential equation of the track vibration for track transition with the abrupt change of rigidity. The influences of the track rigidity abrupt change on track vibration is investigated and the dynamic responses of the track under a single wheel set and a TGV high speed train moving through the track with three rigidity ratios are analyzed by use of this formula and the superposition principle. The computations show that the track rigidity abrupt change in track transition has indeed great influence on track vibration. This influence increases with the increase of the rigidity ratio and train speed. Based on the theoretical analysis, the following remedy principles for track transition are presented. It＇s desirable to use some layers （3-4） to strengthen the foundation rigidity. The dynamic coefficient when train runs on the transition must be less or equal to 1.2 and the rigidity ratio between neighbor layers must be ranging from 0. 5 to 1. The smooth distance in each layer is 5 m, for train speed less or equal to 160 km · h^-1 , and 10 m for train speed over 160 km · h^-1.

关 键 词：轨道振动 轨道基础刚度 刚度突变 轨道过渡段 

分 类 号：U213.213[交通运输工程—道路与铁道工程]