客货共线铁路弹性支承块式无砟轨道结构安全与稳定性分析

Study on Safety and Stability of Low Vibration Track for Mixed Passenger and Freight Railway

在对国内相关标准所规定限值总结的基础上,建立车辆-轨道空间耦合动力学计算模型,重点研究分析不同线路条件、不同类型列车运行工况下弹性支承块式无砟轨道的安全性和稳定性。结果表明,弹性支承块式无砟轨道结构在不同运营条件下(客车最高速度200km/h、货车最大轴重27t):列车运行各项安全性指标及线路轨距动态变化量均在标准规定的限值以内;客车的横向平稳性指标最大值为1.85、垂向平稳性指标最大值为1.88,货车的横向平稳性指标最大值为2.23、垂向平稳性指标最大值为3.42,客车和货车平稳性指标满足1级的标准,平稳性良好。综合计算分析结果,弹性支承块式无砟轨道结构可适用于不同类型客货共线铁路运营条件。

Based on the summary of the limits stipulated by relevant national standards,the vehicle-track spatial coupled dynamics model was established in this paper to study the safety and stability of low vibration track（LVT）in different line conditions and different train operating conditions.The results show that,under different operating conditions（the maximum speed of passenger train is 200 km/h,the maximum axle load of freight trains is 27 t）,the safety index and the dynamic gauge change of the track are within the limits specified by the standards.For passenger train,the maximum lateral stability index is 1.85,and the maximum vertical stability index is 1.88.For the freight train,the maximum lateral stability index is 2.23,and the maximum vertical stability index is 3.42.The stability indicators of passenger and freight trains meet the standard of Class 1,showing guaranteed stability.Based on the analytical results,the LVT structure can be applied to the operation conditions of different kinds of passenger and freight shared railways.