同济大学学报（自然科学版）2024，Vol.52Issue(3)：407-415,9.DOI:10.11908/j.issn.0253-374x.22407
道砟非均匀分布对道床力学特性的影响
Effect of Uneven Ballast Distribution on Mechanical Characteristics of Ballast Bed
摘要
Abstract
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.关键词
有砟道床/颗粒分布/横向阻力/垂向刚度/离散单元法Key words
ballast bed/particle arrangement/lateral resistance/vertical stiffness/discrete element method分类
交通工程引用本文复制引用
许玉德,缪雯颖,李少铮,刘学敏..道砟非均匀分布对道床力学特性的影响[J].同济大学学报（自然科学版）,2024,52(3):407-415,9.基金项目
中央高校基本科研业务费专项资金(22120180239) （22120180239）
中国铁路总公司科技研究开发计划(2017G003-B) （2017G003-B）
国家能源投资集团有限责任公司科技创新项目(GJNY-19-89) （GJNY-19-89）
国能铁路装备有限责任公司技术开发项目(TZKY-21-40) （TZKY-21-40）
