Evaluating the impact of bentonite granule size distribution and swelling on the hydraulic conductivity of geosynthetic clay liners

被引:0
|
作者
Hou, Juan [1 ,2 ]
Chu, Chenxi [1 ]
Benson, Craig H. [3 ]
机构
[1] Shanghai Univ, Sch Mech & Engn Sci, Shanghai 200444, Peoples R China
[2] Qinghai Univ, Sch Civil Engn, Xining 810016, Peoples R China
[3] Univ Wisconsin Madison, Geol Engn, Madison, WI 53706 USA
基金
中国国家自然科学基金;
关键词
GCLS;
D O I
10.1051/e3sconf/202456914003
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The impact of granular size, distribution, total intergranular porosity, mobile intergranular porosity, and the tortuosity of the flow paths on the hydraulic conductivity of geosynthetic clay liners (GCLs) was assessed using a COMSOL hydrodynamic model. Results showed that as the intergranular pore spaces become smaller as the bentonite granules swell, the hydraulic conductivity of the GCL decreases. This effect is more significant when the density of the bentonite is lower. Outcomes from the model also illustrate that flow in GCLs with low hydraulic conductivity occurs in fine pore spaces with a width on the order of 1 um. The mobile intergranular porosity through which flow occurs is approximately 0.05 after the bentonite swells, and is small relative to the total intergranular porosity. This indicates that most water within bentonite having low hydraulic conductivity is occluded within isolated pores. As the hydraulic conductivity decreases, the tortuosity of intergranular flow paths increases, varying from 1.38 to 1.03. The findings provide insight into the complex flow behavior in GCLs and factors that affect achieving low hydraulic conductivity.
引用
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页数:11
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