Effect of a lateral drainage layer on leakage through a defect in a geomembrane overlain by saturated tailings

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Jiying Fan , R. Kerry Rowe
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Abstract

Experiments are conducted to investigate the effect of a drainage layer in/below saturated tailings on leakage through a hole of various shapes and sizes in a 2-mm-thick HDPE geomembrane. Three cases: no drainage (Case 1), drainage layer between two layers of tailings (Case 2), and drainage layer below tailings and above the GMB (Case 3) are examined. Analytical solutions predicting leakage through a circular GMB hole overlain by tailings with an internal drainage in (Case 2) and below (Case 3) tailings are developed, and match the experimental and numerical results well. Results show that a drainage layer separated from the GMB by a thin layer of tailings (Case 2) gives leakage slightly greater than if no drainage layer is present, but 3-5 orders of magnitude lower than when the drainage is placed directly over the GMB (Case 3). In Case 3, leakage is dependent on the hydraulic conductivity k of both the drainage and subgrade, and is not affected by the tailings. Unlike Cases 1 and 2 where the subgrade has negligible effect on leakage, a low permeability subgrade with k less than 10% of k for the drainage layer is recommended in Case 3 to minimize leakage through geomembrane defects.

侧向排水层对饱和尾矿覆盖的土工膜缺陷渗漏的影响
实验研究了饱和尾矿中/下的排水层对通过 2 毫米厚高密度聚乙烯土工膜上不同形状和大小的孔渗漏的影响。研究了三种情况:无排水层(情况 1)、两层尾矿之间的排水层(情况 2)以及尾矿下方和土工膜上方的排水层(情况 3)。得出了预测通过覆盖有尾矿的圆形 GMB 孔泄漏的分析方案,其中尾矿内部有排水层(情况 2),尾矿下方有排水层(情况 3),这些方案与实验和数值结果非常吻合。结果表明,用一层薄薄的尾矿将排水层与岩浆导管隔开(情况 2),其泄漏量略高于没有排水层的情况,但比直接将排水层置于岩浆导管上方(情况 3)的泄漏量低 3-5 个数量级。在情况 3 中,渗漏取决于排水层和基层的导水性 k,不受尾矿影响。与情况 1 和情况 2 不同的是,在情况 2 中,基层对渗漏的影响可以忽略不计,而在情况 3 中,建议采用渗透性低的基层,其 k 值小于排水层 k 值的 10%,以尽量减少土工膜缺陷造成的渗漏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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