连续变温下沥青路面永久变形多因素预估

Multi⁃factor prediction of permanent deformation of asphalt pavement at continuous variable temperature

探究了环境温度、行车荷载和行车速度对沥青路面永久变形的影响,在此基础上,通过灰关联法确定了连续变温条件、路面材料变形特性及施工质量等多因素对车辙深度影响的显著性水平.基于车辙等效原则,进行等效温度数值模拟分析,得到车辙深度-温度关系模型,以确定不同月份的车辙等效温度,从而建立了基于ABAQUS的沥青路面长期永久变形有限元分析模型,用于分析沥青路面实际车辙随服役时间的变化规律.结果表明:环境温度、行车荷载及行车速度均对沥青路面车辙深度产生较大影响,且环境温度对车辙的影响程度最大,行车荷载次之,行车速度影响程度相对较小;等效温度数值模拟分析表明,月车辙等效温度可有效表征路面车辙;建立的预估模型能够有效预测沥青路面永久变形,为控制沥青路面施工质量及指导路面后期养护提供参考.

The effects of ambient temperature,driving load and driving speed on the permanent deformation of asphalt pavement were explored.The grey correlation method was used to determine the significance level of the influence of multiple factors of continuous temperature change conditions,pavement material deformation characteristics and construction quality on rutting deformation.According to the principle of equivalent rutting deformation,the equivalent temperature numerical simulation analysis was carried out,and the rutting deformation⁃temperature relationship model was obtained to determine the equivalent temperature of rutting deformation in different months.A finite element analysis method of long⁃term permanent deformation of asphalt pavement was established based on ABAQUS,which was used to analyze the variation law of actual rutting deformation of asphalt pavement with service time.The results show that the environmental temperature,the driving load and the driving speed all have great influence on the rutting deformation of asphalt pavement,and the decreasing influence sequence is the environmental temperature,the driving load and the driving speed.The numerical simulation analysis of equivalent temperature shows that the monthly equivalent temperature of rutting can effectively characterize the rutting deformation of the pavement.The established prediction model can effectively predict the permanent deformation of the asphalt pavement,which can provide reference for controlling the construction quality of the asphalt pavement and guiding the later maintenance of the pavement.