轨枕悬空条件下的列车-轨道系统竖向振动响应研究

针对道床作为散体结构本身具有弹、塑性,在列车荷载的反复作用下会发生沉降,沉降的不均匀导致轨枕悬空的情况,基于列车—轨道系统竖向振动分析方法,研究1根和几根轨枕悬空时列车—轨道系统的竖向动力响应。计算结果表明,当列车通过悬空轨枕时轮轨相互作用增大,其中轨枕的竖向位移及加速度增长最明显,且随着悬空轨枕的根数增加,动力响应增长越明显;即使毗邻轨枕的支承良好,也受到悬空轨枕的影响,轨枕位移及加速度增长显著;轨枕悬空会加速轨道结构的破坏,甚至危及行车安全。

Research on the responses of vertical vibration of train-track system due to voided sleepers

The settlement of ballast bed which is loose,elastic and plastic structure is caused by repeated traffic loading.Since the amount of settlement is different,the sleepers are always unsupported,even voided.Based on the analysis method of vertical vibration of train-track system,the dynamic responses of the system with one or several voided sleepers were investigated.The calculation results show that when a train passes the voided sleepers the wheel and rail interactions increase,the vertical displacement and vertical acceleration of sleepers increase obviously,and the more sleepers are voided the increase is more obvious;the vertical displacement and vertical acceleration of the sleepers which are well supported adjacent to the voided one will also remarkably increase;that will speeds up the track deterioration rate and even does harm to driving safety.