成都大学学报（自然科学版）2026，Vol.45Issue(2)：195-202,8.DOI:10.3969/j.issn.1004-5422.2026.02.012
列车制动下长大坡道无缝线路纵向力学性能研究
Longitudinal Mechanical Properties of Continuous Welded Rail on Long and Steep Gradients under Train Braking
摘要
Abstract
In service,continuous welded rails(CWR)on long and steep gradients are subjected to train braking and other effects,presenting a complex stress deformation state along longitudinal direction the track.Based on theoretical analysis,this paper derives the calculation formulas for rail braking force and longitudinal displacement of CWR on ballasted tracks of long and steep gradients under train braking.The influences of track gradient,ballast longitudinal resistance,train formation,axle load and wheel-rail adhe-sion coefficient are comparatively analyzed.The results show that with the increase of track gradient and wheel-rail adhesion coefficient,the peak valuse of compressive and tensile forces of rail braking force as well as the maximum value of longitudinal displacement of CWR increase linearly during train braking.As the ballast longitudinal resistance rises,the above peak values exhibit a power-law attenuation character-istic.For different train formation,the peak braking force and maximum longitudinal displacement of CWR re-main nearly constant once the train traction load reaches a critical value.For locomotive and vehicle combina-tions with different axle loads,the braking force and longitudinal displacement of CWR under train braking are comprehensively determined by axle load,axle number,and vehicle length and locomotive length.The influence of train braking on the areas ahead of the first wheel and behind the last wheel is remarkably sensitive to bal-last longitudinal resistance.The smaller the ballast longitudinal resistance,the wider the influencing range.关键词
长大坡道/有砟轨道/无缝线路/制动力/纵向位移Key words
long and steep gradients/ballasted track/continuous welded rail/braking force/longitudinal displacement分类
交通工程引用本文复制引用
令行,蒋金洲,刘晓丹,左浩..列车制动下长大坡道无缝线路纵向力学性能研究[J].成都大学学报（自然科学版）,2026,45(2):195-202,8.基金项目
中国铁道科学研究院集团有限公司基金项目(2023YJ201) （2023YJ201）
