基于渗流理论的破损沥青路面结构渗水量计算

路面破损程度对路面渗水量以及路面水损害具有显著影响。基于裂缝渗流理论模拟水渗入路面的情况，建立了含有裂缝和龟裂的路面雨水渗流的数学物理计算模型，并推导出考虑裂缝和龟裂的沥青路面雨水渗流量的理论计算公式。通过分析破损路面的渗水率和渗水量的试验结果可以看出，路面破损（裂缝、龟裂）对路面渗水量的影响非常大，路面设计时必须予以分析考虑。通过计算分析文中建立的两种模型表明：合理地估计路面渗水量应该根据路面的破损程度，如路面裂缝长度、裂缝宽度、裂缝密度、路面龟裂密度和龟裂破损程度来估算路面的渗水量和渗入率；当表面水渗入量一定时，透水性材料的渗透系数越大，则所需要的透水基层厚度越薄，并且在确定路面的厚度后，透水基层厚度的确定，不仅与透水层的渗透系数有关系，而且还要考虑到路面结构整体的强度要求。

Calculation of seepage flow in damage asphalt pavement based on percolation theory

The damage degree of pavement takes a great effect on the seepage quantityand water damage of pavement. Based on the crack seepage theory for simulating the water infiltration in pavement, the mathematical model for calculating infiltration rate of pavement containing cracks has been established and the theoretical calculation formula of infiltration rate has been deduced. Moreover, the map crack in pavement is also considered which is introduced into another mathematical model for calculating the infiltration rate. The experimental result of analyzing the infiltration rate and seepage quantity of damaged pavement shows that: damaged pavement (crack and map crack) have a great influence on seepage flow, which suggests the design of pavement should be considered reasonably. By calculating and analyzing the two models established in this paper, it shows that the evaluation of seepage quantity should be conducted according to the damage degree of pavement, such as crack length, crack width, crack density and the map cracks of pavement. Additionally, provided that the flux of infiltration capacity of surface course is constant, the higher the permeability coefficient of porous materials is, the thinner the thickness of permeable base course is; When the thickness of surface course of pavement is defined, the thickness of permeable base not only depends on the permeability coefficient of the material of permeable base but also the strength of pavement structure.