重载铁路桥梁段道床清筛作业后轨-桥动力特性  

Track⁃Bridge Dynamic Characteristics After Ballast Bed Cleaning Operation of Heavy Haul Railway Bridge Section

作　　者：柯明亮 马瑞峰 蔡小培[1] 王雨琪 刘万里 KE Mingliang;MA Ruifeng;CAI Xiaopei;WANG Yuqi;LIU Wanli(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道建筑》2024年第11期29-34,共6页Railway Engineering

基　　金：中央高校基本科研业务费专项(2023JBZX030)。

摘　　要：重载铁路桥梁段轨道经大机清筛作业后,道床稳定性不足,在线路开通初期要对列车进行限速,对重载运输造成了极大限制。本文基于重载列车-轨道-桥梁空间耦合模型,研究不同开通速度、列车轴重及道床刚度对列车运行安全性和桥体结构动态响应的影响,对线路复通后轨-桥适应性进行了分析。结果表明:开通速度在60~80 km/h时,列车运行安全性指标及钢轨垂向位移随着列车开通速度的增加而小幅增大,轮轨力、脱轨系数及轮重减载率均符合规范要求,桥体挠度与垂向加速度处于安全范围内;列车轴重对列车运行安全性指标影响很大,轮轨力随着轴重的增加而迅速上升,40 t轴重下桥面垂向加速度超出规范限值,对道床-桥面稳定性造成一定威胁;道床刚度对列车运行安全性指标影响较小,道床刚度越大,钢轨垂向位移越小,桥面垂向加速度越大。After the track of the heavy haul railway bridge section was cleaned and screened by a large machine,the stability of the ballast bed was insufficient.In the early stage of the line opening,the speed of trains had to be limited,which greatly restricted the heavy haul transportation.This article was based on the spatial coupling model of heavy haul train-track-bridge,and studied the effects of different opening speeds,train axle loads,and track bed stiffness on the safety of train operation and the dynamic response of bridge structure.The adaptability of the track-bridge was analyzed after the line is reopened.The results show that when the opening speed is between 60 km/h and 80 km/h,the safety indicators of train operation and the vertical displacement of rails increase slightly with the increase of train opening speed.The wheel-rail force,derailment coefficient,and wheel load reduction rate all meet the requirements of the specifications,and the deflection and vertical acceleration of the bridge body are within the safe range.The axle load of the train has a significant impact on the safety indicators of train operation.The wheel-rail force increases rapidly with the increase of axle load,and the vertical acceleration of the bridge deck under a 40 t axle load exceeds the standard limit,posing a certain threat to the stability of the track bed-bridge deck.The stiffness of the track bed has a relatively small impact on the safety indicators of train operation.The greater the stiffness of the track bed,the smaller the vertical displacement of the steel rail and the greater the vertical acceleration of the bridge deck should be.

关 键 词：重载铁路 铁路桥梁 轨道动力响应 数值计算 桥梁安全性 大型养路机械 道床清筛 

分 类 号：U216.6[交通运输工程—道路与铁道工程]