遂渝线无碴道岔前后轨道刚度过渡段动力学设计

研究目的:本研究主要是为了弄清楚遂渝线无碴轨道综合试验段区间轨道刚度和岔区轨道刚度特性,为提高列车过岔的舒适性及延长轨道结构的使用寿命,本文提出了区间轨道与岔区轨道间轨道过渡段的设置及其设计。研究方法:本研究应用车辆-轨道耦合动力学模型与理论,分析了遂渝线区间及道岔区无碴轨道刚度的特性。研究结果:区间轨道与道岔区轨道间存在着较大刚度差,遂渝线无碴轨道综合试验段无碴道岔区的轨道刚度约是区间线路的2~3倍,应设置轨道刚度过渡段。研究结论:道岔前后轨道刚度差可采用分级过渡的方法,每一级刚度取18孔轨枕间距左右,将钢轨挠度变化率控制在0.3 mm/m以下,由此确定的过渡段结构动力学性能良好。

Dynamic Design of Stiffness Transition of Turnout in Ballastless Track of Suining-Chongqing Railway

Research purposes: The main purposes of research are to clarify the stiffness characteristic of block section and turnout area in integral trial section for ballastless track on Suining-Chongqing Railway.In order to improve comfortableness and prolong the service life of the track structure,the stiffness transion should be set between block section and turnout area.And this paper proposes the transition design between block section and turnout area on Suining-Chongqing railway.Research methods:Based on a theory of train-track coupling dynamics model,the stiffness characteristic of ballastless track in block section and in turnout area in the SuiningChongqing Railway is analyzed.Research results:There are more track stiffness difference between block section and turnout area.Results obtained from the paper show that track stiffness in turnout area is 2~3 times as track stiffness in block section of integral trial section for ballastless track on Suining-Chongqing Railway.Track stiffness transitions should be set there.Research conclusions:The method of the hierarchical track stiffness can be applied in the stiffness transition section of the turnout,and the stiffness is set about 18 sleeper spaces per grade.When the dynamic slope of the deflection of rail is less then 0.3 mm/m,the dynamic performance of the stiffness transition of turnout is satisfactory.