摘要
为研究嵌入式轨道在重载铁路中的适用性,采用有限元法,建立嵌入式轨道有限元模型,从钢轨应力、钢轨位移、轨道板位移的角度分析货车轴载对嵌入式轨道结构受力及变形的影响,并针对现有嵌入式轨道结构进行优化研究。研究结果表明:货车轴载对嵌入式轨道轨头应力、轨底应力、钢轨横向及竖向位移影响显著,其中,轨头应力、钢轨横向位移均超过限值要求,但其对轨道板位移影响较小;采用75 kg/m钢轨替换60 kg/m钢轨后,轨头应力显著减小,但钢轨横向位移仍然超过限值要求;在此基础上,随着填充材料弹性模量的增大,钢轨应力及位移均显著减小,且均在规范限值内,填充材料弹性模量建议取为400 MPa。
The finite element approach is used to create an embedded track finite element model in order to investigate the applicability of embedded track in heavy-haul railway.From the perspective of rail stress,rail displacement,and track slab displacement,the influence of truck axle load on the stress and deformation of embedded track structure are studied,and the existing embedded track structure is adjusted.According to the findings,the truck axle load has a substantial impact on the stress at the head of the rail,the stress at the bottom of the rail,and the lateral and vertical displacement of the rail.Among them,rail head stress and rail lateral displacement all exceed the regulatory requirements,but have no effect on track slab displacement.Following the replacement of 60 kg/m rail with 75 kg/m rail,the stress in the rail head was significantly reduced,but the transverse displacement of the rail still exceeded the limit value.On this basis,as the elastic modulus of filling materials increases,the stress and displacement of rails are greatly decreased,and they are all within the code limitations.It is advised that the elastic modulus of filler materials be 400 MPa.
作者
龚凯
王成
杨强强
刘林芽
卞文君
刘保臣
Gong Kai;Wang Cheng;Yang Qiangqiang;Liu Linya;Bian Wenjun;Liu Baocheng(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;School of Transportation Engineering,East China Jiaotong University,Nanchang 330013,China;Locomotive&Car Research Institute,China Academy of Railway Sciences Co,Ltd.Beijing 100081,China)
出处
《华东交通大学学报》
2023年第4期9-15,共7页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(52068028,51968025)
江西省自然科学基金重点项目(20192ACBL20009)
江西省自然科学基金面上项目(20224BAB204065)
江西省教育厅科学技术项目(GJJ210621)
江西省研究生创新资金项目(YC2022-s556)
中国铁道科学研究院集团有限公司重点课题(2021YJ273)。
关键词
铁道工程
重载铁路
货车轴载
嵌入式轨道
有限元
受力变形
railroad engineering
heavy-haul railway
axle load of wagon
embedded track
finite element
force and deformation analysis