An infiltration model for inclined covers with consideration of capillary barrier effect

毛细管作用 渗透(HVAC) 岩土工程 雨水收集 尾矿 环境科学 水分 材料科学 土壤科学 地质学 复合材料 生态学 冶金 生物
作者
Cen Gao,Wei-Min Ye,Pu-Huai Lu,Zhang-Rong Liu,Qiong Wang,Yong-Gui Chen
出处
期刊:Engineering Geology [Elsevier BV]
卷期号:326: 107318-107318 被引量:4
标识
DOI:10.1016/j.enggeo.2023.107318
摘要

Covers with capillary barrier effect (CCBEs) are widely used as surface cover systems in landfills, mine tailings and water-sensitive soil slopes to prevent rainwater from infiltrating into the protected materials below. In the engineering design, the water-prevention performance of the CCBEs must be quantificationally evaluated according to the local meteorological conditions. In this study, according to the moisture distribution during infiltration, the fine-grained soil layer was divided into saturated, transition and initial zones. Capillary barrier effects were analyzed by considering water migration and redistribution at the interface between fine and coarse-grained layers. Then, the total time, including the time to reach the interface (tHf), the time for overcoming the capillary barrier effect (tc) and the time for passing through the coarse-grained layer (tg), was determined to quantificationally evaluate the water-prevention capacity of the inclined CCBEs under different rainfall conditions. For the case studies selected from literature, the calculated results by the proposed model agree well with the measured data. Finally, some parameters and the factors influencing the capillary barrier effect were further analyzed.
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