基于离散元的小半径曲线有砟道床横向阻力特性及加强措施研究  

Study on lateral resistance characteristics and strengtheningmeasures of small radius curve ballasted bed based on discrete element

作　　者：祁天佑 Qi Tianyou(Xinjiang Railway Survey and Design Institute Co.,Ltd., Xinjiang Urumqi, 830011, China)

机构地区：[1]新疆铁道勘察设计院有限公司,新疆乌鲁木齐830011

出　　处：《机械设计与制造工程》2022年第5期99-103,共5页Machine Design and Manufacturing Engineering

基　　金：中铁第一勘察设计院集团有限公司科技开发计划项目(院科20-65)。

摘　　要：为科学开展曲线段铁路无缝线路运、维、养工作,深入分析了曲线段有砟道床的横向阻力特性。建立了直线段和曲线段有砟道床离散元模型,对比研究了不同曲线半径、列车不同过弯速度下的道床横向阻力变化规律。结果表明:曲线段道床的横向阻力显著低于直线段;有车过弯时道床的横向阻力显著增大,与无车时相比横向阻力增大约162.3%。提出了加强道床稳定性措施,采用砟肩堆高、土工格栅包裹砟肩等均能增大道床的横向阻力,土工格栅加强措施的效果更好。In order to scientifically carry out the operation,maintenance and repair of CWR in curve section,the transverse resistance characteristics of ballasted track bed in curve section are deeply analyzed,and the measures to strengthen the stability of track bed are studied.By establishing the discrete element model of ballasted track bed considering curve,the evolution law of transverse resistance of track bed under different curve radius and different bending speed of train is compared and studied,the measure scheme for strengthening ballast shoulder is put forward,and the lifting effect of transverse resistance after strengthening is analyzed.The results show that the transverse resistance of track bed in curved section is significantly lower than that in straight line without considering the effects of superelevation,widening of ballast shoulder and stacking height of ballast shoulder;When a vehicle turns a corner,the track bed presents an enhancement effect of transverse resistance,which is about 162.3%higher than that without a vehicle,mainly contributed by the pillow bottom resistance;The lateral resistance can be increased by using the pile height of ballast shoulder and wrapping the ballast shoulder with geogrid,and the effect of geogrid reinforcement measures is better.

关 键 词：无缝线路 有砟道床 横向阻力 稳定性 

分 类 号：U213.71[交通运输工程—道路与铁道工程]