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中文摘要：
依据轮轨位移协调相容的条件，建立了车一路垂向耦合时变动力分析模型，分析了列车速度和轨道不平顺幅值对车体振动加速度、轮轨力、板式无砟轨道和路基结构的加速度、动位移以及动应力的影响．计算结果表明：随着列车速度和轨道不平顺幅值的增加，车体垂向加速度、轮轨力、钢轨和轨道板竖向加速度均不断增大，且影响显著；轨道不平顺对钢轨的动位移影响最大，对其他部位的动位移影响较小；轨道不平顺对路基基床振动加速度影响较大，最大值为0．5m／s^2，且基床表层的振动加速度比基床底层的大；无砟轨道结构和路基面动应力随不平顺幅值的增大而增大，且轨道板顶面承受反复的拉压应力；路基动应力沿深度方向衰减较慢．研究结果可为板式无砟轨道路基设计提供理论依据和参考．
英文摘要：
Based on the displacement compatibility conditions of wheels and track, the time-varying vehiclesubgrade dynamic model of vertical coupled system is established. Then the effect of train speed and track irregularity amplitude on vehicle vibration acceleration, wheel-rail force, and acceleration, dynamic displacement and dynamic stress of slab track and subgrade are analyzed. The results show that vehicle vertical ac- celeration,wheel-rail force, and vertical acceleration of rail and slab track increase with train speed and track irregularity amplitude,and the effect is significant. Track irregularity has the most significant effect on dynamic displacement of rail, and the dynamic displacement of other parts is less. The effect of track irregularity on the acceleration of roadbed is larger,and the maximum value is 0. 5m/s^2. The vibration acceleration of the surface of roadbed is larger than the one of the bottom of roadbed. Dynamic stress of ballastless track structure and subgrade surface increases with the track irregularity, and the top surface of the track slab withstands the repeated compressive and tensile stress. Subgrade dynamic stress attenuation along depth is weak. The results can provide theoretical basis and reference for slab ballastless track-sub- grade design.
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