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Effect of prehydration, permeant, and desiccation on GCL/Geomembrane interface transmissivity
Geotextiles and Geomembranes ( IF 5.2 ) Pub Date : 2021-08-02 , DOI: 10.1016/j.geotexmem.2021.04.006
R. Kerry Rowe 1 , Farhana Jabin 2
Affiliation  

A laboratory investigation was conducted on two different conventional GCLs (one with fine granular and another one with powdered bentonite) to explore the effect of prehydration and permeant fluid; GCL desiccation on the interface transmissivity, θ, between the interfaces of a 1.5 mm-thick high-density polyethylene (HDPE) geomembrane (GMB) and a GCL. The study also aimed to assess the self-healing capacity of desiccated GCLs for three different permeant solutions under a range of applied stresses (10–150 kPa). It was found that at stresses less than 70 kPa, θ was dominated by variability in the initial contact condition between the GMB-GCL interfaces. The effect of other factors was largely masked by the contact variability. At 100–150 kPa, the effects of initial variability were largely eliminated, but there was no notable effect of other factors on θ in the absence of desiccation. GCL desiccation increased θ by up to three orders of magnitude than an intact specimen at 10–100 kPa. Even at 150 kPa, desiccated specimens had a θ ≤ 8.0 × 10−9 m2/s for all specimens tested. The chemical composition of the permeant solutions, crack width, and nature of bentonite could play an important role in healing the cracks of desiccated GCLs.



中文翻译:

预水化、渗透和干燥对 GCL/土工膜界面透射率的影响

对两种不同的常规 GCL(一种为细颗粒状,另一种为粉状膨润土)进行了实验室调查,以探讨预水化和渗透流体的影响;GCL 在1.5 毫米厚的高密度聚乙烯 (HDPE) 土工膜 (GMB) 和 GCL 的界面之间的界面透射率θ上的干燥。该研究还旨在评估干燥的 GCL 在施加压力范围 (10-150 kPa) 下对三种不同渗透剂溶液的自愈能力。发现在应力小于 70 kPa 时,θ由 GMB-GCL 界面之间初始接触条件的可变性主导。其他因素的影响在很大程度上被接触变异性掩盖了。在 100-150 kPa 时,初始变异的影响基本消除,但在没有干燥的情况下,其他因素对θ没有显着影响。GCL 干燥使θ比 10-100 kPa 的完整样品增加了三个数量级。即使在 150 kPa 下,对于所有测试的样本,干燥的样本的θ  ≤ 8.0 × 10 -9  m 2 /s。渗透剂溶液的化学成分、裂缝宽度和膨润土的性质在愈合干燥 GCL 的裂缝方面可能发挥重要作用。

更新日期:2021-10-04
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