京张高速铁路有砟轨道动力特性及轨枕优化研究

Research on Dynamic Characteristics of Ballasted Track and Optimization of Sleeper in Beijing-Zhangjiakou High-speed Railway

目前国内有砟轨道多用于时速250 km及其以下线路,为考察列车运行速度提高对有砟轨道动力特性的影响,建立了路基段高速车辆-有砟轨道动力学模型,对比了列车运行时速由250 km提高到350 km时轨道结构及车辆动力响应的变化。同时计算并对比分析了加宽轨枕、加长加高轨枕、加宽加高轨枕3种轨枕改型方案对有砟轨道受力变形的影响,结合工程实际对高速有砟轨道轨枕结构的优化提出了合理建议。

The ballasted track is usually used to the railway engineering of 250km/h and below. A dynamic model of high-speed train and ballasted track on subgrade was established and the change of track system and vehicle dynamic response were compared as the train speed was increased from 250 km/h to 350 km/h to research the effect of the improved velocity of high-speed train on the dynamic response of ballasted track,. Besides, the influences of three optimal kinds of sleeper, including Widened Sleeper, Lengthened and Heightened Sleeper, Widened and Heightened Sleeper, on the stress and deformation of ballasted track were calculated and analyzed. Advice on the optimal design of sleeper for high-speed railway was proposed based on the engineering practice.