Traction or braking operations are usually applied to the motor cars or locomotives for acceleration and deceleration, especially in perilous mountain high-speed railways that have complex and large gradient sections. Under such a circumstance, the wheel-rail longitudinal interactions may become more intense, which could induce longitudinal impact on the track structure. In this paper, some new concepts are introduced to account for this rarely concerned issue. Two typical interface interactions for a slab track system are fully considered, involving the longitudinal resistance between the rail and rail pad based on the Dahl friction model, and the longitudinal cohesive force between the prefabricated slab and CA (cement asphalt) mortar layer based on the bilinear cohesive zone model. By introducing system longitudinal vibrations and implementing the interface interactions into the classical vehicle-track system, a novel vehicle-slab track vertical-longitudinal coupled dynamics model is established, and investigated under the combined excitation of rail irregularities and polygonal wheel wear in traction conditions. Results indicate that the developed model is capable of capturing the longitudinal interactions between the track structures and enables considering initiation or evolution of the damage at the interface between the track slab and CA mortar subjected to complex train dynamic loads.

牵引或制动操作通常用于汽车或机车的加速和减速，特别是在危险的山地高速铁路，路段复杂，坡度大。在这种情况下，轮轨纵向相互作用可能会变得更加强烈，从而对轨道结构产生纵向冲击。在本文中，引入了一些新概念来解释这个很少关注的问题。充分考虑了板式轨道系统的两种典型界面相互作用，涉及基于 Dahl 摩擦模型的轨道与轨垫之间的纵向阻力，以及基于双线性内聚区模型。通过在经典车轨系统中引入系统纵向振动并实现界面相互作用，建立了一种新的车板轨道纵纵耦合动力学模型，并在牵引条件下钢轨不规则和多边形车轮磨损的联合激励下进行了研究。结果表明，开发的模型能够捕捉轨道结构之间的纵向相互作用，并能够考虑在复杂列车动态载荷下轨道板和 CA 砂浆之间的界面处的损伤的发生或演变。并在牵引条件下轨道不平整度和多边形车轮磨损的联合激励下进行了研究。结果表明，开发的模型能够捕捉轨道结构之间的纵向相互作用，并能够考虑在复杂列车动态载荷下轨道板和 CA 砂浆之间的界面处的损伤的发生或演变。并在牵引条件下轨道不平整度和多边形车轮磨损的联合激励下进行了研究。结果表明，开发的模型能够捕捉轨道结构之间的纵向相互作用，并能够考虑在复杂列车动态载荷下轨道板和 CA 砂浆之间的界面处的损伤的发生或演变。