车辆多轮随机动载作用下柔性沥青路面的应变分析

摘要

In order to analyze the strain of a flexible asphalt pavement under vehicle random dynamic loads,the finite element model of the flexible asphalt pavement considering its viscoelasticity was established with the finite element analysis software ABAQUS.The flexible asphalt pavement's strain responses in three directions under multi-wheel random dynamic loads of vehicles were simulated.The strains'time histories features were analyzed under random dynamic loads of a multiaxial vehicle and the maximum strain of each point on the pavement was obtained.The results showed that the strains of each asphalt layer's top surface and bottom surface for 3 layers of different asphalt materials are different in three directions and their variations are also different;on the top surface of the upper;layer and the bottom surface of the lowest layer in the longitudinal direction or the width direction,the maximum strains in 3 directions of each point are different;the strains caused by the middle and rear wheel axle loads are larger than those caused by the front wheel axle loads in the longitudinal direction and the transverse strains are bigger than the vertical and longitudinal strains.The results provided a reference for the design of flexible asphalt pavement structures and the analysis of pavement life.%为进行车辆多轮随机动载作用下柔性沥青路面的应变分析，采用有限元分析软件 ABAQUS 建立考虑柔性沥青路面黏弹性的三维有限元模型，仿真计算车辆多轮随机动载作用下柔性沥青路面三个方向的应变响应，分析车辆多轴作用下路面应变时程变化特性，得到路面各点的最大应变。结果表明，在路面某一位置，三种沥青材料组成的沥青各层顶面和下面层底面产生的三个方向的应变大小及变化规律均不相同；沥青上面层顶面和下面层底面无论是路面长度方向还是宽度方向，各点的三个方向的最大应变均不相同，沿路面长度方向，中、后轴车轮荷载产生的应变大于前轴车轮荷载产生的应变，且横向应变大于纵向和垂向应变。研究结果可为柔性沥青路面结构设计与路面寿命分析及预测提供参考依据。