中文摘要：

根据列车运行的实际情况,将轨道—路基作为参振子结构纳入车辆计算模型,建立车辆、钢轨、轨枕、道床、路基和地基为一体的二系垂向耦合动力分析模型,分析列车速度变化对车辆运行品质、动位移以及路基动应力的影响。结果表明：车体加速度、动轮载和轮重减载率均随车速的提高而增大,呈线性分布;具有二系悬挂的高速列车通过有砟轨道路基结构时,列车的安全性及舒适度均能满足要求;系统动位移受速度影响较小;路基面动应力随速度的提高而增大,并在横向呈马鞍形分布,在纵向呈抛物线形分布;路基动应力沿路基深度方向衰减较快,在基床表面下3 m处,动应力只有基面的16%左右。研究结果与已有部分研究结论吻合较好,表明模型具有较高的可靠性。

英文摘要：

According to the actual situation of train operation, track and subgrade are regarded as a part of the vibration structure of vehicle model, a secondary suspension vertical coupled dynamic model including vehicle, rail, sleeper, ballast, subgrade and foundation has been established. The effect of train speed on vehicle operation quality, dynamic displacement and subgrade dynamic stress is analyzed. The results show that the vehicle acceleration, the dynamic wheel load and offload factors increase with train speed, and dis- tribute linearly. The safety of train operation and running comfort can meet the requirements when the high-speed train under secondary suspension passing through ballasted track subgrade structure. The dynamic displacement of the system is less influenced by train speed. The dynamic stress of subgrade surface increases with speed improving, and it is distributed as saddle along the lateral direction and as parabola a- long the longitudinal direction of subgrade surface. The dynamic stress of subgrade declines sharply along the depth of subgrade. The dynamic stress on 3 m depth below subgrade bed surface is about 16 percent of that of subgrade surface. Results of this study agree well with some existing document results, which shows that the model is of high reliability.