开裂沥青路面结构渗水量计算

Calculation for infiltration rate of flow in cracking asphalt pavement

摘要:

为合理估计路面渗水量和准确计算路面渗入率,基于裂缝渗流理论模拟了路表水的渗入情况,建立了裂缝和龟裂路面中雨水渗流的数学物理计算模型,推导出了考虑裂缝和龟裂的沥青路面雨水渗入量的理论计算公式.通过分析破损路面的渗入率和渗水量的试验结果,发现路面破损(裂缝、龟裂)对路面水渗入量的影响非常大,路面排水系统设计时须予以考虑.计算分析建立的2种模型,结果表明:应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;在确定路面厚度后,排水基层厚度的确定,不仅与排水基层的渗透系数有关,还要考虑路面结构整体的强度要求.

Abstract:

Based on the crack seepage theory for simulating the water infiltration in pavement,a mathematical model for calculating infiltration rate of pavement with cracks has been established and the theoretical calculation formula of infiltration rate has been deduced.The formula can be applied to evaluate the infiltration,optimize the drainage design and improve the efficiency of drainage system.Further,the map cracks distributed in pavement are also considered and included in another mathematical model for calculating the infiltration rate in pavement with map cracks.The experimental results for the infiltration rate and flow quantity of damaged pavement show that cracks and map cracks give a great contribution to the water quantity infiltrating into the pavement.It is suggested that the design of infiltration rate should take the cracks and map cracks into consideration reasonably.By calculating and analyzing the two models established in this paper,it shows that the evaluation of infiltration rate should be conducted according to the damage degree of pavement,such as crack length,crack width,crack density and the distribution of map cracks throughout pavement.Additionally,if the thickness of surface course of pavement is determined,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.