Abstract
AbstractThe chemical compatibility of backfills for soil-bentonite vertical cut-off walls is examined in this paper. The use of soil-bentonite cut-off walls as hydraulic barriers for waste containment facilities is on the rise. Their low hydraulic conductivity to water is attributed to the bentonite in the soil-bentonite backfills, which is composed primarily of smectite mineral. However, there have been concerns as to the compatibility of soil-bentonite backfills, since bentonite is very sensitive to chemical effects and this can lead to an increase in hydraulic conductivity. Thus, Fujian standard sand was employed for simulating a sandy soil layer, and Hebei Bentonite and Jiangning Clay were served as additives for studying the chemical compatibility of sand-bentonite backfills. The present study focuses on the influences of the stress level on the hydraulic conductivity, bound water content and effective porosity of soil-bentonite backfills under the situation of calcium chloride solutions with various concentrations.KeywordsBound waterChemical compatibilityEffective confining stressesEffective pore voidSoil-bentonite backfills
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