高等级道路沥青路面车辙的预估方法

PREDICTION OF RUTTING IN ASPHALT PAVEMENT OF HIGH-CLASS ROAD

根据在MTS试验机上对沥青混合料所进行的不同温度、不同应力及不等加载方式下的蠕变试验,对沥青混合料的高温变形特性进行了较为全面的分析,提出了一种有效地表征沥青混合料变形特性的流变学模型,并采用曲线拟合法确定了沥青混合料的模型参数。借助于粘弹性理论和所提出的流变学模型,建立了一种高等级道路沥青路面车辙的预估方法。结合路面的实际条件,提出了车辙计算中有关参数的确定方法,并绘制了供车辙计算查用的诺模图。试验道路上车辙观测结果同预估值较为一致,证实了建议的车辙预估方法的可靠性。

In the first part, a comprehensive research on the deformation behaviour of asphalt mixtures is carried out by means of static and dynamic uniaxle creep tests. Based on the test results, an effective rheological model is developed to represent the deformation characteristics of asphalt mixtures, and the model parameters are determined with curve-fitting method. In the second part, a rutting prediction proccedure is advanced with the rheological model and viscoelastic theory. The parameters related to rutting prediction are reasonably determined and a nomography of rutting calculation is presented. The good agrement between predicted and measured rutting depths in test roads indicates that the prediction method is reliable.