基于渗流理论的沥青路面渗入率计算与分析

Calculation and analysis of infiltration rate of asphalt pavement based on percolation theory

针对路面面层下设排水基层的路面,考虑路面存在裂缝的情况,采用微管渗流理论和裂缝渗流理论模拟水渗入路面,建立存在裂缝路面的渗入率数学计算模型,得出考虑裂缝沥青路面渗入率的理论计算公式。研究结果表明:规范规定的渗入率计算值150cm3/(h·cm)偏小,采用该渗入率对于路面因使用产生损害后的渗水情况估计不准确,应该根据路面的破损程度如裂缝长度和裂缝宽度以及裂缝密度来估算路面渗入率;当路面水渗入量为常量时,基层透水性材料的渗透系数越大,则透水基层厚度越小;基层透水性材料的渗透系数越小,则透水基层厚度越大。

For the pavement containing cracks, which is set porous base course between surface course, the tube theory and fracture seepage theory for simulating the water infiltration in pavement were adopted. The mathematical model for calculating infiltration rate of pavement containing cracks was established and the theoretical calculation formula of infiltration rate was deduced. Then, the model was calculated and analyzed. The results show that the infiltration rate presented by the standard is lower and can not be applied to accurately estimate the infiltration capacity of pavement in a later damage, while the infiltration rate should be determined according to the damage degree of pavement, such as crack length, crack width and crack density. If the flux of infiltration capacity of surface course is constant, the higher the permeability coefficient of porous materials, the thinner the thickness of porous base course, while the lower the permeability coefficient of porous materials, the thicker the thickness of porous base course.