Self-healing capacity of GCLs under simulated field conditions

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Jinchun Chai , Xiaoxiao Zhu , Jixiang Nie , Takenori Hino
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引用次数: 0

Abstract

The self-healing capacities of a GCL with natural bentonite (NB) as core (NB-GCL) and a GCL with a polymerized bentonite (PB) as core (PB-GCL) were investigated under simulated field conditions, i.e. geomembrane-GCL-a clayey subsoil layer composite liner system with a damage hole on the geomembrane and the GCL. The clayey subsoils tested had initial water contents of 22.2% and 26.8%. The liquids used were deionized (DI) water and 0.3 M NaCl solution. The test results indicate that for both the PB-GCL and NB-GCL only hydrated on the subsoils for 1–3 months, a damage hole of 15 mm in diameter was almost not self-healed. For cases of applying a constant liquid head on the top of the geomembrane of 100 mm, the sizes of damage holes were self-healed in term of diameter is about half of the values reported in the literature for tests with plenty liquid supply to the damaged GCLs. Further, for the conditions tested and for the cases self-healed, DI water leaked into the subsoil was less than about 60 g, and 0.3 M NaCl solution leaked was less than 150 g.

模拟现场条件下 GCL 的自愈能力
在模拟现场条件下,研究了以天然膨润土(NB)为核心的 GCL(NB-GCL)和以聚合膨润土(PB)为核心的 GCL(PB-GCL)的自我修复能力,即土工膜-GCL-粘性底土层复合衬垫系统,土工膜和 GCL 上有一个损坏孔。测试的粘性底土的初始含水量分别为 22.2% 和 26.8%。使用的液体是去离子水和 0.3 M NaCl 溶液。试验结果表明,PB-GCL 和 NB-GCL 只在基土上水化 1-3 个月,直径为 15 毫米的破坏孔几乎不会自愈。在土工膜顶部施加 100 毫米恒定液头的情况下,受损孔洞的自愈直径约为文献报道的受损 GCL 大量供液试验值的一半。此外,在测试条件和自愈情况下,渗漏到底土中的去离子水少于约 60 克,渗漏的 0.3 M NaCl 溶液少于 150 克。
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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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