基于FWD的沥青路面动态弯沉温度修正系数

Temperature correction coefficient for dynamic deflection of asphalt pavement based on FWD

基于不同沥青路面的结构厚度和温度参数,对FWD实测的动态弯沉计算结果进行修正研究。按照分阶段函数拟合方法,建立弯沉修正系数与路面结构厚度、温度的两参数关系模型;该模型充分考虑沥青混合料模量的温度敏感性,可以保证当结构层厚度为0℃或温度为20℃时,弯沉修正系数为1,当温度升高或降低时,修正系数趋于一个稳定的最小值或最大值。此模型具有明确的物理意义,可更好地反映出路面材料实际力学状态,使弯沉参数的判断和评价更为科学、有效。

Based on the structural thickness and temperature parameters of different asphalt pavements, the correction studies on dynamic deflection based on FWD measured data were carried out. By using the fitting method of multi-phase function, a two-parameter model of deflection correction coefficient considering the thickness of pavement structure and the temperature was established. In this model, the sensitivity of asphalt mixture modulus to temperature was taken into account sufficiently, which can ensure that when the thickness of structural layer is 0℃ or the temperature is 20℃, the correction coefficient of pavement deflection is 1, and when the temperature is increased or decreased, the correction coefficient tends to a stable minimum or the maximum value. This model has a clear physical meaning, can reflect the actual states of the pavement materials very well, and make the judgment and evaluation on deflection parameters more scientific and effective.