首页|道砟非均匀分布对道床力学特性的影响

道砟非均匀分布对道床力学特性的影响

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  • 国家科技期刊平台
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  • NSTL
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铁路道床机械清筛作业中，分次回填道砟颗粒会导致道砟分层，出现非均匀分布现象。为了解道砟非均匀分布对道床力学特性的影响，基于离散单元法基本原理，生成有砟道床仿真模型，模拟道砟均匀分布、"上大下小"分层分布、"上小下大"分层分布等3种道床工况，分析3种道床工况在捣固作业和稳定作业中的力学特性变化。结果表明:道砟非均匀分布对道床力学特性产生影响，其中道床密实度特性受道砟分布状态影响较小，而道床垂向刚度和横向阻力特性则受道砟分布状态影响较大。在捣固作业中，道砟"上小下大"分层分布最有利于道床垂向刚度提升。在稳定作业中，道砟"上大下小"分层分布最有利于道床横向阻力提升。道砟颗粒流动则是使得道床垂向刚度和横向阻力提升的重要因素。
Effect of Uneven Ballast Distribution on Mechanical Characteristics of Ballast Bed
During the mechanical cleaning operation on ballast bed,backfilling ballast in batches would lead to a layered and uneven ballast distribution.To reveal the effect of uneven ballast distribution on the mechanical properties,the simulation model of ballast bed was generated based on the basic principle of discrete element method.Then three kinds of ballast layering distributed conditions were simulated in the model,the uniform distribution,"large upper and small lower"distribution and"small upper and large lower"distribution,respectively.And the mechanical characteristics of ballast bed during the tamping operation and the stabilizing operation were analyzed.The results show that the uneven ballast distribution has impact on the mechanical properties of ballast bed.The compactness of ballast bed is less affected,while the vertical stiffness and the lateral resistance are obviously affected.During the tamping operation,the"small upper and large lower"ballast distribution is most conducive to improve the vertical stiffness.While during the stabilizing operation,the"large upper and small lower"ballast distribution is most conducive to improve the transverse resistance.The flow of ballast particles is an important factor to improve the vertical stiffness and the lateral resistance of ballast bed.

ballast bedparticle arrangementlateral resistancevertical stiffnessdiscrete element method

许玉德、缪雯颖、李少铮、刘学敏

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同济大学 道路与交通工程教育部重点实验室,上海 201804

同济大学 上海市轨道交通结构耐久与系统安全重点实验室,上海 201804

浙江省轨道交通运营管理集团有限公司,浙江 杭州 310014

国能铁路装备有限责任公司,北京 100011

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有砟道床 颗粒分布 横向阻力 垂向刚度 离散单元法

中央高校基本科研业务费专项中国铁路总公司科技研发计划国家能源投资集团有限责任公司科技创新项目国能铁路装备有限责任公司技术开发项目

221201802392017G003-BGJNY-19-89TZKY-21-40

2024

10.11908/j.issn.0253-374x.22407

同济大学学报(自然科学版)
同济大学

同济大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.88
ISSN：0253-374X
年,卷(期)：2024.52(3)
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