Slab tracks or so-called ballastless tracks have been widely adopted for highspeed rail networks. Material properties of slab track components have significant influences on the serviceability performance of both high-speed trains and the slab tracks. In reality, the stiffness of rail pads and moduli of elasticity of concrete and CA mortar are quite different when they are determined by using either quasi-static or dynamic loading tests. Based on a critical literature review, most previous studies adopted some static material properties despite the fact that the actual loads from high-speed trains onto slab tracks are dynamic excitations. In addition, some studies simply adopted the dynamic stiffness of rail pads whilst ignored the dynamic effect on modulus of elasticity in their simulations. This study is thus the world’s first to highlighting the influence of the dynamic material properties on the train-track vibration interactions. A nonlinear 3D coupled vehicle-slab track model has been developed based on the multi-body simulation principle and finite element method using LS-DYNA. This model has been validated by comparing its results with full-scale field test data together with other simulation results. A very good agreement among the results has been found. The magnification effect on the dynamic modulus of elasticity under dynamic train loads has been determined firstly. The influences of material properties on the serviceability performance of the vehicle, the wheel-rail contact force, the vibration responses of the rail, concrete slab, and CA mortar have then been evaluated. The deviation coefficients of vibration responses of the vehicle and track under three types of material properties have been determined to emphasise the influences of the dynamic stiffness and modulus of elasticity. The novel insight stemmed from this study provides a new reference and state-of-the-art recommendation for adopting suitable and realistic material properties of high-speed slab tracks in practice.

平板轨道或所谓的无ball轨道已广泛用于高速铁路网络。平板轨道组件的材料特性对高速列车和平板轨道的可维修性性能都有重要影响。实际上，当使用准静态或动态载荷测试确定导轨垫的刚度以及混凝土和CA砂浆的弹性模量时，它们有很大不同。根据重要的文献综述，尽管从高速火车到板坯轨道的实际载荷是动态激励，但大多数以前的研究仍采用了某些静态材料特性。此外，一些研究只是采用了轨垫的动态刚度，而在模拟中忽略了对弹性模量的动态影响。因此，这项研究是世界上第一个突出动态材料特性对列车-轨道振动相互作用的影响的研究。基于多体仿真原理和基于LS-DYNA的有限元方法，开发了非线性3D耦合车辆平板轨道模型。通过将其结果与全面的现场测试数据以及其他仿真结果进行比较，验证了该模型的有效性。在结果之间找到了很好的一致性。首先确定了动态列车荷载作用下对动态弹性模量的放大作用。然后评估了材料性能对车辆使用寿命，轮轨接触力，钢轨，混凝土板和CA砂浆的振动响应的影响。确定了三种材料特性下车辆和轨道的振动响应的偏差系数，以强调动态刚度和弹性模量的影响。从这项研究中得出的新颖见解为在实践中采用合适和现实的高速平板轨道材料特性提供了新的参考和最新建议。