Experimental Study on Hydraulic Conductivity of Clay-Bentonite Mixed Soil Liner

被引：0
作者：
Lin, Hai [1 ,2 ]
Shi, Huabao [1 ]
Zhou, Chuangbing [1 ,2 ]
Lyu, Zhitao [1 ]
机构：
[1] School of Infrastructure Engineering, Nanchang University, Nanchang
[2] Watershed Carbon Neutrality Engineering Research Center, The Ministry of Education, Nanchang University, Nanchang
来源：
Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 23期
基金：
中国国家自然科学基金;
关键词：
bentonite mixing ratio; clay; confining pressure; degree of compaction; hydraulic conductivity;
D O I：
10.11896/cldb.23090001
中图分类号：
学科分类号：
摘要：
mpervious 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. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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