摘要
研究目的:采用无砟轨道是重载铁路的发展趋势,结构设计参数是开展重载铁路桥上无砟轨道设计的关键。本文建立车-轨-桥系统耦合动力分析模型,研究钢轨形式、道床板宽度和道床板厚度对系统动力特性的影响规律,采用层次分析法综合评价,提出单层长枕埋入式无砟轨道关键设计参数取值。研究结论:(1)与60 kg/m钢轨相比,采用75 kg/m钢轨时车体垂向加速度和轮轨垂向力增大,轨道结构位移和受力减小;(2)随着道床板的宽度和厚度增大,结构垂向振动位移随之增大,车体垂向加速度、轮轨垂向力、轮重减载率、桥梁垂向加速度、扣件反力和道床板与桥梁接触应力均随之减小;(3)桥上无砟轨道系统动力综合评价结果随道床板宽度和厚度的增加而减小;(4)结合无砟轨道的动力特性及工程投资,建议重载铁路桥上单层长枕埋入式无砟轨道采用60 kg/m钢轨,道床板宽度取3.0 m,道床板厚度取0.275 m;(5)本研究成果可为桥上单层长枕埋入式无砟轨道结构设计参数取值提供参考。
Research purposes:The use of ballastless track is the development trend of heavy-haul railway,and the structural design parameters are the key to carry out the design of ballastless track on the bridge of heavy-haul railway.The system coupled dynamic analysis model of vehicle-track-bridge was established in this paper,and the influence of rail type,track slab width and track slab thickness on the system dynamic characteristics were analyzed.The comprehensive evaluation was evaluated by analytic hierarchy method,and the design parameters of the single layer long sleeper embedded ballastless track were proposed.Research conclusions:(1)Compared with 60 kg/m rail,the vertical vibration acceleration of vehicle and wheel-rail vertical force increase when 75 kg/m rail is used,and the displacement and force of track structure decrease.(2)With the increase of track slab width and thickness,the track structure vertical displacement increase,and the vibration acceleration of vehicle,wheel-rail vertical force,rate of wheel load reduction,vibration acceleration of bridge,fastener system reaction force and the contact stress between track slab and bridge decrease.(3)The dynamic comprehensive evaluation results of ballastless track decrease with the increase of the width and thickness of track slab.(4)Combined with the dynamic responses and engineering investment,it is suggested that the rail type is 60 kg/m rail,track slab width is 3.0 m and track slab thickness is 0.275 m used for the single layer long sleeper embedded ballastless track on the bridge of heavy-haul railway.(5)The research results can provide reference for structural design parameter values of single layer long sleeper embedded ballastless track on the bridge.
作者
杨文茂
杜建军
徐浩
邓军桥
蔡文锋
林红松
YANG Wenmao;DU Jianjun;XU Hao;DENG Junqiao;CAI Wenfeng;LIN Hongsong(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China;Guangzhou Maritime University,Guangzhou,Guangdong 510725,China)
出处
《铁道工程学报》
北大核心
2025年第2期35-40,共6页
Journal of Railway Engineering Society
基金
广东省基础与应用基础研究基金(2023A1515110398)
四川省重点研发计划项目(2024YFHZ0221)
中国科协青年人才托举工程(2019QNRC001)
中铁二院科学技术研究计划(KSNQ223022)。
关键词
单层长枕埋入式无砟轨道
动力响应
层次分析法
设计参数
single layer long sleeper embedded ballastless track
dynamic responses
analytic hierarchy method
design parameters
作者简介
杨文茂,1988年出生,男,高级工程师。
