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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。
Aiming at the fact that the ballast bed itself has the elasticity and plasticity as the bulk structure itself, the settlement will occur under the repetition of train load, and the sleepers will not be vacant due to the uneven settlement. Based on the vertical vibration analysis of train-track system, Vertical dynamic response of train-rail system with sleepers suspended. The calculation results show that the wheel-rail interaction increases when the train passes the suspended sleeper, and the vertical displacement and acceleration of sleeper increase most obviously. With the increase of the number of suspended sleepers, the dynamic response increases more obviously. Even if the adjacent sleeper supports Good, but also by the impact of suspended sleepers, sleeper displacement and acceleration increased significantly; sleeper will accelerate the suspension of the track structure damage, and even endanger traffic safety.