重载铁路小半径曲线地段钢轨波磨弹塑性演化特征分析  

Analysis on elastoplastic evolution characteristics of rail corrugation in small radius section of heavy-haul railway

作　　者：金锋[1,2] 肖宏[1,2] 王连俊[1,2] 姜子清[3] 杨冀超[4] JIN Feng;XIAO Hong;WANG Lianjun;JIANG Ziqing;YANG Jichao(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Key Laboratory of Track Engineering,Beijing Jiaotong University,Beijing 100044,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Track Maintenance Section,China Railway Beijing Group Co.Ltd.,Beijing 100038,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学轨道工程北京市重点实验室,北京100044 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [4]中国铁路北京局集团有限公司高铁工务段,北京100038

出　　处：《中南大学学报（自然科学版）》2023年第8期3358-3369,共12页Journal of Central South University:Science and Technology

基　　金：中央高校基本科研业务费专项资金资助项目(2022JBXT010);北京市自然科学基金−丰台轨道交通前沿研究联合基金资助项目(L211006)。

摘　　要：针对重载铁路小半径曲线地段钢轨波磨严重的问题,通过建立基于semi-Hertzian轮轨接触算法的小半径曲线地段敞车动力学模型与三维钢轨弹塑性循环加载模型,分析重载塑流型波磨演化过程中波谷、波峰区域塑性行为特征,并对比和分析外轨超高、曲线半径等线路要素对波磨发展的影响。研究结果表明:钢轨表面在轮轨循环荷载作用下将迅速达到安定状态,且在安定状态下波磨波谷的塑性累积变形比波峰的塑性累积变形大,波磨轨波峰、波谷的塑性累积特征的差异促进了钢轨波磨病害的进一步发展;在不同的曲线半径条件下,波磨波谷区域塑性累积沿深度方向差异明显,当曲线半径较小时,最大累积塑性应变出现在钢轨表面;当曲线半径较大时,钢轨表面塑性特征不显著,最大塑性累积点出现在轨面下2~3 mm处;较小的曲线半径与线路过超高对钢轨波磨病害的发展具有显著的促进作用,因此,在线路设计过程中,应尽量避免选择小于500 m的曲线半径;而对于既有线而言,线路过超高将促使波磨病害的进一步发展,在运营过程中应保证车辆运营速度。As the serious condition of rail corrugation in the small radius curve of the heavy-haul railway,the dynamics model of wagons and the elastic-plastic cyclic loading model of the small radius curve based on semi-Hertzian wheel-rail contact algorithm were established,and the plastic behavior characteristics of trough and crest region were revealed in the evolution process of heavy-haul corrugation.The influences of rail cants and curve radius on the development of rail corrugation were compared and analyzed.The results show that the rail surface material will reach a stable state with the action of wheel/rail load,and the plastic accumulation deformation of the trough area of rail corrugation is larger than that of the crest region.The difference in the plastic accumulation characteristics of the troughs and crests promotes the further development of rail corrugation.With different curve radii,the plastic accumulation in the corrugation through varies obviously along the direction of depth.When the curve radius is small,the maximum plastic accumulation occurs on the rail surface,and the maximum plastic accumulation point appears within the range of 2−3 mm below the rail surface while the curve radius is larger.Small curve radius and superelevation excess have an obvious promoting effect on the development of rail corrugation disease.In the process of the track design,a curve radius less than 500 m should be avoided as far as possible.For the operating line,the excessive superelevation will promote the further development of corrugation disease,so the vehicle operating speed should be maintained in the operation process.

关 键 词：重载铁路 钢轨波磨 塑性变形 

分 类 号：U216.9[交通运输工程—道路与铁道工程]