摘要
为探讨不同轨底坡设置条件下轮轨接触关系及钢轨受力情况,建立C80型重载货车动力学模型,在轨底坡为1/20、1/30、1/40及无轨底坡条件下,对比分析轮轨接触特性、行车安全性、蠕滑特性及轮轨磨耗趋势。分析结果表明,针对目前重载货车普遍使用的LM型车轮踏面,内外轨均设置1/20轨底坡的布置方案将有利于小半径曲线地段货车通过时钢轨受力,缓解小半径曲线地段频发的钢轨波磨、异常磨耗及轮轨接触疲劳现象,有效提升钢轨使用寿命。在曲线内侧,由于垫板失效等原因导致无轨底坡时,轮轨接触区域明显向钢轨轨角区域外移,相较于设置轨底坡工况,接触面最大应力增幅为15.5%、脱轨系数增幅为10.2%、蠕滑作用及磨耗增幅分别为16.5%和12.6%。因此,应在线路工务养护过程中重视钢轨波磨病害整治及轨底坡保持,并对轨下垫板失效地段及时进行检修,线路设计时应根据不同的线路条件设置合理的轨底坡。
In order to discuss the wheel-rail contact relationship and rail stress under different rail cant,the dynamic model of C80 heavy-haul truck was established.The wheel-rail contact characteristics,driving safety,creep characteristics and wheel-rail wear trend under 1/20,1/30,1/40 and no rail cant conditions were compared and analyzed.The analysis result shows that,according to the LM wheel tread commonly used in heavy-haul trucks at present,the layout scheme of 1/20 rail cant on both inner and outer rails will be beneficial to the rail stress when trucks pass through small radius curved sections.It is beneficial to alleviate the frequent rail corrugation,abnormal wear and wheel-rail contact fatigue in small radius curve section,and effectively improve the service life of rail.In the inner side of the curve,when there is no rail cant due to the failure of the backing plate,the wheel-rail contact area obviously moves outward to the rail angle area.Compared with the condition of setting rail cant,the maximum stress increase of contact surface is 15.5%,the derailment coefficient increase is 10.2%,and the creep effect and wear increase are 16.5%and 12.6%,respectively.Therefore,it is crucial to act the treatment of rail corrugation disease and the maintenance of rail cant in the process of maintenance timely,and repair the failure section of rail backing plate and set reasonable rail cant according to different line conditions in line design.
作者
折成林
She Chenglin(Shenshuo Railroad Subsidiary Company of Baoshen Railway Group of CHN ENERGY,Yulin 719316,China)
出处
《铁道勘察》
2022年第5期104-109,共6页
Railway Investigation and Surveying
基金
国家能源投资集团科技创新项目(SHGF-16-50)
关键词
重载铁路
轨底坡
磨耗
轮轨接触
轮轨接触疲劳
heavy-haul railway
rail cant
abrasion
wheel-rail contact
wheel-rail contact fatigue
