路基冻胀幅值变化对车轨耦合系统的影响分析

Analysis of Influence of Subgrade Frost Heave Amplitude Change on Vehicle-track Coupling System

为了研究路基冻胀幅值变化对车辆轨道系统的影响,基于车辆轨道耦合动力学理论,建立车-轨耦合模型,分别计算路基冻胀幅值为0,10,15,20 mm时对车体、钢轨、道床板的位移和加速度的振动响应影响.结果表明:系统的动力响应随着行驶车速和路基冻胀幅值的增大而相应增大;影响行驶车辆的路基冻胀幅值限值应控制在20 mm/20 m以下;在制定路基冻胀标准时,应综合考虑幅值和波长.

In order to study the influence of the change of frost heave amplitude of subgrade on vehicle-track system, a vehicle-rail coupling model is established based on the vehicle-track coupling dynamics theory, and the vibration response of the car body, rail and track bed board to the displacement and acceleration was calculated respectively in the subgrade frost heave amplitude of 0, 10, 15 and 20 mm. The results show that the dynamic response of the system increases with the increase of the driving speed and the frost heave amplitude of the subgrade, the limit value of frost heave amplitude of subgrade affecting vehicles should be controlled below 20 mm/20 m. The settlement amplitude and wavelength should be considered comprehensively when the foundation frost heave standard is adopted.