长大坡道上弹性支承块式无砟轨道稳定性研究

Study on Stability of Ballastless Track with Elastic Support Block on Long Slope

某铁路长大连续坡道上存在大量的凹曲线路段,在长大坡道的凹曲线上铺设的弹性支承块式无砟轨道由于竖向约束较弱,在列车荷载、温度力、制动力等作用下,可能发生竖向失稳。因此,有必要对长大坡道上弹性支承块式无砟轨道的适应性进行分析。文章根据弹性支承块式无砟轨道的结构特点和在长大坡道上力的传递机理,建立了有限元分析模型,分析了直线坡道和凹曲线上弹性支承块轨道在不同温度荷载、不同坡度上的钢轨纵向力和位移变化情况。结果表明:(1)在直线地段,各种工况下的钢轨纵向位移较小,不会出现爬行现象,弹性支承块轨道对坡道的适应能力较好;(2)在凹曲线地段,温度力作用下的弹性支承块式无砟轨道轨枕可能发生空吊。该结论可为弹性支承块式无砟轨道的应用范围研究提供参考。

There are many concave curve sections on the long and continuous ramp in Some Raiway line,where the ballastless track with elastic support block may suffer from vertical instability due to weak vertical constraint under the action of train load,temperature force and braking force.Therefore,it is necessary to analyze the adaptability of the ballastless track with elastic support block on the long ramp.In this paper,according to the structural characteristics of the ballastless track with elastic support block and force transfer mechanism on long ramp,the finite element model is established to analyze the change of longitudinal force and displacement in rail of track with elastic support block under different temperature load and different gradient on the straight line and the concave curve.The results show that in straight line section,the longitudinal displacement of the rail under various working conditions is relatively small,and there is no creeping phenomenon,and the track with elastic support block has better adaptability to the ramp,and that in concave curve section,the sleeper of the ballastless track with elastic support block is likely to be suspended under the action of temperature force.This conclusion can provided reference for the study of the application range of ballastless track with elastic support block.