摘要
"一带一路"沿线国家的铁路轨距存在差异,这使得列车行驶过程中产生更大的线路不平顺,同时轨道部件的拉、压应力的变化对轨道部件的使用寿命造成影响.通过建模分析可知:轨距变化主要影响轨枕、道床的位移与受力,对钢轨的影响较小.轨道各部件的位移在标准轨距时较小,与标准轨距时相比,轨枕的位移最高增加了300%,道床的位移最高增加了38%,而钢轨竖向位移最大增量仅为4%.不同轨距下的轨道部件拉、压应力存在较大差异,轨枕拉应力最大增加了59%,道床的拉应力最大增加了214%,轨枕的压应力最大增加了55%,道床的压应力最大增加了312%,而钢轨拉、压应力无变化.为改变轨距对轨枕与道床的位移、拉应力、压应力影响,延长轨道部件的使用寿命,需在轨距过渡处合理设置轨道刚度过渡.
Because different countries have different railway gauges along"One Belt and One Road",line irregularity shall be paid attention.The change of tension/compression stress of track components affects the service life of track.Through the analysis of the model,it can be seen that the change of track gauge mainly affects the displacement and stress of sleepers and ballast beds,but has little influence on the rail.Under the influence of gauge change,the standard gauge has the smallest displacement at each component of the track.Compared with the standard gauge,the maximum displacement of sleeper increases 300%and the maximum displacement of ballast bed increases 38%,while the maximum vertical displacement of the rail increases only 4%.There are great differences in the tensile and compressive stresses of track components under different gauges.With comparison of maximum and minimum of each parameter,the tensile stress of sleeper,the tensile stress of ballast bed,the compressive stress of sleeper and the compressive stress of ballast bed is increased by 59%,214%,55%and 312%,respectively.But the tensile/compressive stress of the rail keeps the same.In order to improve the influence of track gauge on the displacement and tensile/compressive stress of sleeper and track bed,and to extend the service life of track components,it is necessary to set a reasonable track stiffness transition at the track gauge transition.
作者
亓伟
曹勇
赵振航
莫宏愿
QI Wei;CAO Yong;ZHAO Zhenhang;MO Hongyuan(Research Center for Modern Rail Transit Application Technology,Chengdu Vocational&Technical College of Industry,Chengdu 610218,China;MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)
出处
《铁道建筑》
北大核心
2020年第5期131-134,共4页
Railway Engineering
基金
国家自然科学基金(51778543)。
关键词
有砟轨道
变轨距
轨道结构
受力特性
刚度过渡
ballast track
gauge-changeable
track structure
mechanical characteristics
stiffness transition
