中国铁道科学2023，Vol.44Issue(6)：67-79,13.DOI:10.3969/j.issn.1001-4632.2023.06.07
非对称轨枕空吊对钢轨力学行为影响规律研究
Study on the Influence Law of Asymmetrically Unsupported Sleeper Rail Mechanical Behavior
摘要
Abstract
To study the mechanical behavior of wheel/rail under the excitation of asymmetrically unsupported sleepers,a wheel/rail dynamic model is established based on the parameters of typical ballasted lines and in-service vehicles in China.The analytical solution of rail deflection displacement based on Winker elastic foundation assumption is used to verify the reliability of the simulated results.On this basis,the mapping relationship between the wheel/rail vertical force and the maximum rail deflection displacement and the depth of unsupported sleeper is simulated under the condition in which the vehicle runs through 1-3 asymmetrically unsupported sleepers at the speed of 200 km·h-1.The results show that critical unsupported capacity of the sleepers exists in all calculation conditions,the maximum deflection displacement of the rail increases with the depth of unsupported sleeper when the depth is less than the critical depth;and the increased slope is related to the number of unsupported sleepers.When the depth is greater than the critical depth,the maximum deflection displacement of the rail and the wheel/rail vertical force tend to be stable.There is the difference in equivalent support stiffness of the foundation under the rail in the zone of the asymmetrically unsupported sleepers,which will cause wheelset load increase or reduction.The rates of maximum wheel load decrease is about 9.54％,20.3％,28.2％,respectively under the conditions of 1-3 single-side unsupported sleepers.The rate of maximum wheel load decrease reduces but the maximum deflection displacement of rail increases in the case of double-side unsupported sleepers.The research results can provide reference for wheel/rail mechanical behavior,dynamic/static difference analysis of track irregularity and disease detection in zones with unsupported sleepers.关键词
轨枕空吊/轮轨动力学/钢轨挠曲位移/轮轨垂向力/轨道不平顺Key words
Unsupported sleeper/Wheel rail dynamic model/Rail deflection/Wheel/rail vertical force/Track dynamic and static irregularity分类
交通工程引用本文复制引用
牛留斌,杨静静,刘丙强,杨飞,张志川,王琰..非对称轨枕空吊对钢轨力学行为影响规律研究[J].中国铁道科学,2023,44(6):67-79,13.基金项目
国家重点研发计划项目(2022YFB2602901) （2022YFB2602901）
中国国家铁路集团有限公司科技研究计划重大课题(P2021T013) （P2021T013）
中国铁道科学研究院集团有限公司院基金课题(2021YJ014) （2021YJ014）
