空吊轨枕对轨道结构的动力影响分析

Effect of Voided Sleepers on Track Structure Dynamics

基于车辆-轨道耦合动力学理论,对车辆通过空吊轨枕轨道段时轮轨系统的动力响应进行了数值仿真计算。分析了轨道结构由于轨枕空吊而产生的动力响应变化,研究了车辆通过空吊轨枕轨道段时轨道结构动力响应的速度效应。研究结果表明:车辆通过空吊轨枕轨道段时,轮轨动力作用急剧增大,钢轨和轨枕垂向位移也随之增大,毗邻轨枕处的枕上压力和道床顶面压力增幅明显;连续空吊轨枕越多,轮轨动力作用越大,对轨道结构的破坏也将越严重;随着速度的提高,空吊轨枕产生的动力影响更加显著。

Based on the theory of vehicle-track coupling dynamics, the wheel/rail system dynamic responses are carried out through numerical simulation method when a vehicle passing over voided sleepers. The results show that the wheel/rail dynamical interactions increase when a vehicle passing over the voided sleeper, the displacements of voided sleepers and rail increase, rail/sleeper contact forces and sleeper/ballast contact forces at adjacent sleepers increase also. It is found that the dynamic responses of wheel/rail system increase obviously with the number of voided sleepers increasing, and this will speed up the track deterioration process. Influence of vehicle speed on wheel/rail system dynamic responses was investigated.