市域铁路装配式无砟轨道结构关键参数研究

Research on the Key Parameters of the Urban Railway Assembly Ballastless Track Structure

研究目的:为解决市域铁路现浇枕式无砟轨道结构施工周期长、质量波动大等问题,结合国内各类预制板式无砟轨道应用经验,提出一种适用于市域铁路的新型装配式无砟轨道结构设计方案,建立了可考虑无砟轨道各部件复杂相互作用关系的静、动力学分析模型,研究了轨道板厚度、限位凸台型式及尺寸、限位凸台弹性垫板刚度等参数对轨道结构受力性能的影响,以及轨道结构在160 km/h行车速度下的动力特性。研究结论:(1)综合考虑结构受力情况和建造成本控制,建议轨道板厚度取180~220 mm;限位结构采用“矩形+圆形倒角”凸台方案,长度取400~600 mm,宽度取400~600 mm;凸台弹性垫板刚度取8.4~9.6 kN/mm;(2)列车以160 km/h速度运行时车辆、轨道结构动力特性良好,力学指标均满足规范要求;(3)研究结果可为优化市域铁路装配式无砟轨道结构型式和提升线路质量提供参考。

Research purposes:In order to solve the problems of long construction period and large quality fluctuation of cast-in-place sleeper type ballastless track structure for urban railways,combined with the application experience of various prefabricated slab ballastless tracks,a new type of prefabricated ballastless track structure design scheme suitable for urban railways is proposed.A static and dynamic analysis model that can consider the complex interaction relationship of various components of ballastless track is established,and the influence of parameters such as the thickness of track slab,the type and size of the limit convex,and the stiffness of the limit convex elastic pad,is studied on the stress performance of the track structure,as well as the dynamic characteristics of the track structure at a driving speed of 160 km/h.Research conclusions:(1)Considering the structural stress and construction cost control,it is recommended that the thickness of the track plate should be 180~220 mm:.The limit structure adopts the"rectangular+circular chamfering"convex scheme,the length is 400~600 mm,the width is 400~600 mm:.The stiffness of the convex elastic plate is 8.4~9.6 kN/mm.(2)The dynamic characteristics of the vehicle and track structure are good when the train is running at 160 km/h,and the mechanical indexes meet the requirements of the specification.(3)The research results can provide a reference for optimizing the structure type of prefabricated ballastless track in urban areas and improving the quality of the line.