单元双块式无砟轨道道床板温度翘曲变形的影响研究

Study on Warping Deformation of Slab in Unit Twin-block Ballastless Track

单元双块式无砟轨道中的道床板在温度梯度作用下会产生翘曲变形,可能对轨道几何形位产生不利影响,从而危害行车安全。采用有限元方法建立单元双块式无砟轨道计算模型,探索温度梯度作用下道床板的翘曲变形规律及其对轨道几何形位的影响。结果表明:在正温度梯度作用下,道床板的翘曲变形较大,可能危害高速行车安全,需采取措施进行控制;而在负温度梯度作用下,道床板的温度翘曲变形较小,可忽略。

Warping deformation of track slab under the effect of temperature gradient may do some harm to track geometry and even endanger traffic safety. In this paper,the finite element method is adopted to establish a calculation model of unit twin-block ballastless track to explore warping deformation of the slab under the effect of temperature gradient and its impact on track geometry. Results show that large warping deformation of slab under positive temperature may endanger traffic safety and measures should be taken to control it. However,under negative temperature,warping deformation of slab is so small that it can be ignored.