摘要
研究目的:采用少维修的无砟轨道结构是重载铁路长大隧道地段的必然选择,本文通过建立车辆-轨道耦合动力学模型,对不同车速、不同轴重、不同轨道结构、不同过渡形式下的系统动力响应进行对比,以确定出最佳轨道类型和过渡段类型,进而为无砟轨道在重载铁路隧道中的设计提供理论依据。研究结论:(1)车速增加对轨下结构的振动加速度影响较大;(2)随着轴重增加,除轮重减载率以外,其他各项指标均随轴重的增加而增大,且增幅较大;(3)长枕套靴式无砟轨道道床垂向应力较小,但脱轨系数大,道床垂向位移较大;双块式无砟轨道钢轨垂向位移小,但道床垂向应力、钢轨垂向力均较大;弹性支承块式无砟轨道脱轨系数和轮重减载率较小,道床垂向应力适中,利于重载铁路环境下铺设使用;(4)将有砟与无砟过渡段设置在路基上时,车辆运行的安全性指标控制得较好,并且因冲击而产生的钢轨加速度明显减小,且扣件的支反力也明显减小;(5)本研究成果对开展重载铁路无砟轨道结构设计具有参考价值。
Research purposes: Using ballastless track structure with less maintenance is the inevitable choice for long and large tunnel section of heavy haul railway. The vehicle-track coupling dynamics model was established. By comparing the dynamic response of the system under different speeds,axle loads,track structures and transitional types,the best track type and transition section type were determined,to provide the theoretical basis for the design of ballastless track in the heavy haul railway tunnel.Research conclusions:( 1) The increase of vehicle speed has a great influence on the vibration acceleration of under rail structure.( 2) With the increase of axle load,all indexes except wheel load reduction rate increase greatly with the increase of axle load.( 3) The vertical stress of ballastless track bed with long sleepers and shoes is small,but the derailment coefficient is large and the vertical displacement of track bed is large. The vertical displacement of double block ballastless track is small,but the vertical stress of track bed and rail is large. The derailment coefficient and wheel load reduction rate of elastic support block ballastless track are small,and the vertical stress of track bed is moderate,which is conducive to the use of heavy-duty railway environment.( 4) When the ballasted and ballastless transition sections are set on the subgrade,the safety index of vehicle operation is well controlled,and the rail acceleration caused by impact is obviously reduced,and the reaction force of fastener is also significantly reduced.( 5) The research results would guide the design of ballastless track structure in heavy-haul railway.
作者
王会永
WANG Huiyong(China Railway Design Corporation,Tianjin 300308,China)
出处
《铁道工程学报》
EI
北大核心
2020年第6期36-40,84,共6页
Journal of Railway Engineering Society
关键词
重载铁路
无砟轨道
车辆-轨道耦合动力学
heavy haul railway
ballastless track
vehicle-track coupled dynamics
