基于蠕变模型的沥青混合料车辙有限元分析

Finite Element Analysis of Asphalt Mixture Rutting Based on Creep Model

通过室内车辙试验结果拟合分析得到了不同温度下沥青路面上、中和下面层常用AC-13,AC-20和AC-25三种沥青混合料的蠕变模型参数(A,n和m).利用基于应变硬化蠕变模型的有限元分析,对多重应力和三层全厚式沥青混合料的车辙发展进行了模拟验证.研究表明,蠕变模型能够准确模拟不同沥青混合料在不同应力和温度条件下的车辙发展,其可用于预测沥青路面在实际交通和气候条件下的不同面层车辙发展.

Creep model parameters（A,n,m）of AC-13,AC-20 and AC-25 asphalt mixtures,commonly used as the upper,middle and bottom layer in asphalt pavement,were determined by fitting the results of indoor rutting test at different temperatures.Finite element analysis based on the strain hardening creep model was carried out to to simulate the rutting evolution of mixtures under multi-stress rutting test and three layers rutting test.It is shown that the creep model can accurately simulate the rutting evolution of different asphalt mixtures at different stress and different temperature.This modeling approach can be used to predict the rutting evolution of different layers in asphalt pavement under actual traffic and climate conditions,which provides a basis for the asphalt mixture design and pavement structure optimization.