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为了从沥青混合料不连续特征角度研究其永久变形行为,采用离散元方法进行了沥青混合料虚拟车辙试验. 根据概率理论及蒙特卡洛方法,编写了考虑集料级配及不规则形状的沥青混合料二维数字试件生成程序. 在生成的数字试件基础上进行了沥青混合料离散元虚拟车辙试验,并利用基于时温等效原理的计算方法以减少虚拟车辙试验的计算时间. 最后将模拟结果与室内试验结果进行了比较. 研究结果表明: 基于时温等效原理的离散元黏弹性模型计算方法可以大大减少计算时间; 虚拟车辙试验中沥青混合料变形情况与室内车辙试验相似,虚拟车辙试验的变形量及动稳定度略大于室内车辙试验; 建立的沥青混合料二维虚拟车辙试验能够预测沥青混合料的永久变形性能.
In order to study the permanent deformation behavior of asphalt mixture from the perspective of discontinuity characteristics of asphalt mixture, a virtual rut test of asphalt mixture was carried out by discrete element method.According to probability theory and Monte Carlo method, asphalt with gradation of aggregate and irregular shape Based on the generated digital specimen, the virtual rut test of discrete mixture of asphalt mixture was carried out, and the calculation method of virtual rutting test was reduced by using the calculation method based on the time-temperature equivalence principle. The simulation results are compared with those of the indoor test.The results show that the calculation method of the discrete element viscoelastic model based on the time-temperature equivalent principle can greatly reduce the calculation time.The deformation of the asphalt mixture in the virtual rutting test is similar to the indoor rutting test, The deformation and dynamic stability of the virtual rutting test are slightly larger than the indoor rutting test. The two-dimensional virtual rut test of the asphalt mixture can predict the permanent deformation performance of the asphalt mixture.