Capillary effect on flow in the drainage layer of highway pavement
Capillary effect on flow in the drainage layer of highway pavement
复制标题
DOI：
10.1139/l2012-050
复制
发表时间：
2012-05
影响因子：
1.4
通讯作者：
DanHan-Cheng;XinPei;Liling;Liliang;LockingtonDavid
中科院分区：
文献类型：
--
作者：
DanHan-Cheng;XinPei;Liling;Liliang;LockingtonDavid
本文旨在研究毛细作用对公路路面排水层水流的影响。采用基于理查兹方程的二维模型模拟排水层中的饱和和非饱和水流。为了进行比较，还使用基于1-D Boussinesq方程的模型和基于拉普拉斯方程的2-D模型对流动进行了模拟，这两种模型都仅假设饱和流动。排水层用砂和砾石模拟，砂和砾石具有与实践中常用的填充材料相似的水力特性。结果表明，两种饱和水流模型吻合较好，表明排水层中水平水流占主导地位。然而，他们的预测显着不同的饱和水流模型。后一种模型预测显着的流动活动在一个相对较大的非饱和区，特别是桑迪排水层。这种非饱和流有助于并提高排水系统的能力。
This paper aims to examine capillarity effect on flows in the drainage layer of highway pavement. A two-dimensional (2-D) model based on the Richards equation was used to simulate saturated and unsaturated flows in the drainage layer. For comparison, flows were also simulated using a 1-D Boussinesq equation based model and a 2-D model based on the Laplace equation, both assuming saturated flow only. The drainage layer was modeled with sand and gravel, which possess similar hydraulic properties to those of commonly used filling materials in practice. The results showed that the two saturated flow models agreed well with each other, indicating the dominance of horizontal flow in the drainage layer. However, their predictions differed significantly from those of the variably saturated flow models. The latter model predicted significant flow activities in a relatively large unsaturated zone, especially for a sandy drainage layer. Such unsaturated flow contributes to and enhances the capacity of the drainage l...