ABSTRACT

The rutting resistance design of asphalt pavement is full of compromise between technology and economy because it is difficult to predict rutting evolution and distribution. In order to investigate the criterion of rutting, two forms yield function based on the Perzyna theory were contrasted and utilised in the finite element model. Besides, temperature and traffic load, the most important factors of rutting, were taken into consideration to make the analysis of yield function closer to the field condition of pavement. Two resistance points were proposed as criterions in this paper. One can be used in pavement maintenance to figure out the depth of serious rutting, the other can be used in pavement design to determine the usage depth of modified asphalt mixture. The analysis illustrates that the key to controlling rutting at intersections is to use better anti-rutting materials at the top layers instead of deepening the usage of modified asphalt mixture. Besides, the depth of rutting varies dramatically with axle weights. It can be inferred that there may be deviations of the prediction for the rutting distribution and evolution when using the method of equivalent axle weight.

摘要

沥青路面的抗车辙设计充满了技术与经济的折衷，因为车辙演变和分布难以预测。为了研究车辙的判据，对基于Perzyna理论的两种形式的屈服函数进行了对比，并在有限元模型中加以利用。此外，还考虑了车辙最重要的温度和交通荷载，使屈服函数的分析更接近路面的现场状况。本文提出了两个阻力点作为判据。一种可用于路面养护，以确定严重车辙的深度，另一种可用于路面设计，以确定改性沥青混合料的使用深度。分析表明，控制交叉路口车辙的关键是在顶层使用更好的抗车辙材料，而不是深化改性沥青混合料的使用。此外，车辙深度随车轴重量的变化而显着变化。可以推断，当使用当量轴重的方法时，对车辙分布和演变的预测可能存在偏差。