沥青路面足尺加速加载车辙预估

    Rutting Prediction of Asphalt Pavement With Full-scale ALF Test

    • 摘要: 为了建立预估精度高、适用性广的车辙预估模型,提出了考虑混合料剪切强度、路面剪应力、轴载作用次数、路面温度、行车速度和路面厚度的车辙预估模型.该模型采用指数函数表达,采用加速加载设备(ALF)对3种足尺路面结构进行了3种不同温度、不同轴质量下的加速加载车辙试验,并测试了不同加载次数下的车辙深度;以3种结构的车辙深度、试验温度、路面剪应力、结构层厚度、加载次数共117组数据为基础参数,通过多元拟合分析,确定了基准速度为20 km/h的简化车辙预估模型;结合时间硬化蠕变模型及荷载作用时间函数,确定了车辙深度与行车速度的关系,将简化的车辙预估模型经速度修正后得到最终的车辙预估模型.研究结果表明,该车辙预估模型具有因素全面、适用性广的特点,预估精度高.

       

      Abstract: A rutting predictive model utilized a power equation was developed with six factors,namely shear strength of asphalt mixture,shear stress of pavement structure,number of load repetitions,pavement temperature,vehicle speed and pavement depth,so as to develop a rutting predictive model with high predictive precision and extensive applicability.The rutting test with accelerated loading facility(ALF) was carried out on three types of pavement structures under three different pavement temperature and load pressure,and the rutting depth was measured at certain loading numbers.The simplify rutting predictive model setting the 20 km/h as the basic vehicle speed was determined through multi-fitting analysis of 117 sets data,including rutting depth,test temperature,shear stress,pavement thickness and loading numbers.The relation between pavement rutting and vehicle speed was determined by the time-hardening creep model and the function of load time,as a result,the simplify model was revised for the vehicle speed to the final rutting predictive model.Resultsshow that the rutting predictive model has comprehensive factors,extensive applicability and high predictive precision.

       

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