中文摘要：

针对季节冻土区春融期重载车辆作用下道路病害突出的问题,以三轴重载汽车为例,建立季节冻土区春融期重载车辆-路面-路基体系垂向动力学物理模型;基于D＇ Alembert原理推导了重载车辆、路面和路基冻结层的振动微分方程,并采用Wilson-θ法对动力方程求解。数值仿真结果表明：建立的路面-路基体系模型能够反映季节冻土区春融期路基呈层状分布且刚度软化的特性;随着车体质量增加和路基融化层刚度的降低,路面振动位移平均峰值和路面振动加速度平均峰值基本呈线性增加;车辆行驶速度增大,路面振动加速度平均峰值增大,优势频段数目增多、优势频率增大;路面振动位移平均峰值呈锯齿型;路基冻结层厚度增加,路面振动位移平均峰值和路面振动加速度平均峰值降低,当其厚度大于0.3 m后趋于稳定。

英文摘要：

Aimed at problem of serious pavement and subgrade disease under heavy vehicle during the spring-thawing period in seasonal frozen region,taking three axles heavy vehicle as an example,a vertical dynamical physical model of heavy vehicle-pavement-subgrade system during the spring-thawing period in seasonal frozen region was developed.Based on the D＇Alembert principle,the dynamic differential equations of heavy vehicle,pavement and frozen subgrade layer were presented,and the dynamic equations were solved by Wilson-θ method.Numerical simulation results show that the proposed pavement-subgrade model is able to display the subgrade characteristics and weak stiffness in seasonal frozen region.With increasing of the vehicle body mass and decreasing of the subgrade thawing layer stiffness,the pavement average peak values of the vibration displacement and acceleration increase linearly.With increasing of the traveling speed,the average peak value of pavement vibration acceleration increases,numbers of dominance frequency and frequency channel increase,however,the distribution of average peak value of pavement vibration displacement presents the wave shape.When the frozen subgrade layer thickness increases,the average peak values of pavement vibration displacement and acceleration decrease.When the thickness is lower than 0.3 m,the values keep steady.