Experimental Study on Hydraulic Conductivity of Clay-Bentonite Mixed Soil Liner
LIN Hai1,2,*, SHI Huabao1, ZHOU Chuangbing1,2, LYU Zhitao1
1 School of Infrastructure Engineering, Nanchang University, Nanchang 330031, China 2 Watershed Carbon Neutrality Engineering Research Center of the Ministry of Education, Nanchang University, Nanchang 330031, China
Abstract: Impervious liner barrier is a crucial part in pollution prevention and control. Adding bentonite into clay to form a mixed soil liner can integrate the advantages of economy and impermeable effect, but the promotion of this kind of mixed soil liner in engineering application needs to farther systematic understanding of its hydraulic conductivity characteristics. Here, to the mixed soil liner sample with general clay and sodium bentonite, permeability tests are carried out using the large-size flexible wall permeameter under different initial degree of compaction, bentonite mixing ratios and confining pressures, and the hydraulic conductivity characteristics of the clay-bentonite mixed soil liner are comparatively analyzed under various conditions. The test results indicate that the hydraulic conductivity of the mixed soil liner with 5% sodium bentonite is significantly lower than that of the compacted clay liner, and the effect of initial degree of compaction and confining pressure on the hydraulic conductivity of mixed soil liner is significantly less than that of compacted clay liner. To ensure the similar anti-seepage effect, the clay-bentonite mixed soil liner have lower construction requirement for initial compactness than the conventional clay liner. The confining pressure of about 50 kPa can make the mixed soil liner easily meet the existing engineering impermeable regulations.
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2024, Vol. 38 
