Self-healing capacity of GCLs under simulated field conditions

被引:0
作者
Chai, Jinchun [1 ]
Zhu, Xiaoxiao [1 ,2 ,3 ,4 ,5 ]
Nie, Jixiang [6 ]
Hino, Takenori [1 ]
机构
[1] Saga Univ, Grad Sch Sci & Engn, 1 Honjo Machi, Saga 8408502, Japan
[2] Wenzhou Univ, Coll Civil Engn & Architecture, Wenzhou 325035, Peoples R China
[3] Key Lab Engn & Technol Soft Soil Fdn & Tideland Re, Wenzhou 325035, Peoples R China
[4] Zhejiang Int Sci & Technol Cooperat Base Ultrasoft, Wenzhou 325035, Zhejiang, Peoples R China
[5] Zhejiang Collaborat Innovat Ctr Tideland Reclamat, Wenzhou 325035, Zhejiang, Peoples R China
[6] Jiyuan Vocat & Tech Coll, Coll Architecture & Civil Engn, Jiyuan 459000, Henan, Peoples R China
基金
日本学术振兴会;
关键词
Geosynthetics; GCL self-healing; Composite liner; Laboratory test; GEOSYNTHETIC CLAY LINERS; HYDRAULIC CONDUCTIVITY; HYDRATION; POLYMER; DESICCATION; WATER; DIFFUSION; SUBJECT; DAMAGE; SAND;
D O I
10.1016/j.geotexmem.2023.12.006
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
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.
引用
收藏
页码:408 / 420
页数:13
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