Pavement subsurface drainage: importance of appropriate subbase materials
Pavement subsurface drainage: importance of appropriate subbase materials
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DOI：
10.1139/t09-021
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发表时间：
2009-08
影响因子：
3.6
通讯作者：
Marc Lebeau;J. Konrad
中科院分区：
文献类型：
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作者：
Marc Lebeau;J. Konrad
过去和当前的研究已经清楚地确定了道路环境中地下排水不足的有害影响。作为回应，路面工程师已经开发了一些理论模型，以建立路面的横向排水要求。本文的目的是通过考虑透水性底基层的存在来扩展当前的排水设计。一个扩展形式的排水时间问题的参数研究进行，同时专注于饱和和非饱和条件下的底基层材料特性的影响。数值计算结果表明，添加合适的底基层材料可以通过结合重力、渗透距离和排放面积的影响来提高垂直水运动，从而将排水时间从几天缩短到几分钟。虽然增加底基层材料的饱和导水率通常被证明有利于垂直排水，但它也产生了阻碍排水的毛细屏障效应。
Past and current research has clearly established the detrimental effects of inadequate subsurface drainage within a road environment. In response, pavement engineers have developed a number of theoretical models to establish the lateral drainage requirements of pavements. The intention of the present paper is to extend current drainage design by accounting for the presence of a pervious subbase layer. A parametric study of an extended form of the time to drain problem was performed while focusing on the effect of subbase material characteristics under saturated and unsaturated conditions. The numerical results established that the addition of a suitable subbase material can shift drainage time from days to minutes by combining the effects of gravity, seepage distance, and discharge area to enhance vertical water movement. Although increasing saturated hydraulic conductivity of the subbase material was generally shown to favour vertical drainage, it also created a capillary barrier effect that hindered do...