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| Numerical parametric study of percolation through capillary barrier cover with zipper-shape interface |
Yahua ZHENG1( ),Hongwei LIU2,Song FENG1,*() |
1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
2. Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China |
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Abstract A novel capillary barrier cover was proposed, which added multiple gravel segments to the traditional cover with capillary barrier effects (CCBE) to form a zipper-shape CCBE between fine-grained and coarse-grained soils. The zipper-shape interface along the slope was designed to help the formation of several diversion lengths while controlling water percolation location. The drainage ditch arranged below the gravel segment was effectively used to reduce the water percolation into the buried wastes underneath the cover. Considering the gravel segment sizes, the thickness of fine-grained soils, the slope of CCBE, rainfall pattern, and extreme and prolonged rainfall, the hydraulic performance of the proposed zippered CCBE with the traditional one was compared. Results showed that the water percolation of zippered CCBE was 17%-25% lower than the traditional one. In both extreme and prolonged rainfall conditions, the percolation of the zippered CCBE was lower than the international annual percolation standard. Increased percolation of the zippered CCBE was observed when the gravel segment height exceeded 0.2 m or the gravel segment width and spacing augmented, and water percolation gradually decreased with the increase of the thickness of fine-grained soils and the slope of landfill cover. Among the two types of CCBE, percolation varies under different rainfall patterns, ranked from highest to lowest: the advanced rainfall pattern, the uniform pattern, the central pattern, and the delayed pattern. Compared to the traditional CCBE, the zippered one is less affected by the rainfall pattern in terms of water percolation.
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Received: 25 January 2024
Published: 25 April 2025
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| Fund: 国家自然科学基金资助项目（52178320, 42177120）；国家重点研发计划资助项目（2019YFC1806003）. |
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Corresponding Authors:
Song FENG
E-mail: 201982010019@sdust.edu.cn;sfengaa@connect.ust.hk
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锯齿状毛细阻滞覆盖层渗漏量的参数研究
在传统毛细阻滞覆盖层的粗-细粒土界面处添加多个方形碎石垄，形成锯齿状的毛细阻滞覆盖层. 锯齿状毛细阻滞界面有利于在顺坡方向形成多个导排长度，主动控制底部渗漏位置. 在碎石垄下方设置的导排盲沟收集部分渗漏雨水，降低进入固废堆体的渗漏量. 考虑碎石垄尺寸、细粒土层厚度、覆盖层坡度、雨型、极端降雨和长时间降雨等参数，对比锯齿状毛细阻滞覆盖层与传统毛细阻滞覆盖层的性能. 结果表明，锯齿状毛细阻滞覆盖层的渗漏量比传统毛细阻滞覆盖层的低17%~25%；无论是在极端降雨情况下，还是在长时间降雨情况下，锯齿状毛细阻滞覆盖层的渗漏量均小于国际年渗漏量标准. 碎石垄高度超过0.2 m或碎石垄边长和间距增加会导致锯齿状毛细阻滞覆盖层的渗漏量增加，底部渗漏量随覆盖层坡度和细粒土层厚度的提高逐渐减小. 2种覆盖层在不同降雨模式下的渗漏量由大到小依次为超前型降雨、等强型、中心型模式、滞后型, 锯齿状毛细阻滞覆盖层的渗漏量受雨型的影响较传统毛细阻滞覆盖层的小.
关键词：
锯齿状覆盖层,
水分运移,
毛细阻滞,
渗漏,
有限元
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