关键词: bentonite;loess;laterite;hydraulic conductivity;compressive strength;hydraulic gradient

Abstract:

Loess and laterite distributed widely in the northern and southern China cannot be directly
used as the natural barrier to isolate the solid waste because of their high hydraulic
conductivity. In this paper, they are enhanced by bentonite to improve their hydraulic
performance. The impact of bentonite content and water content on compressive strength of
the compacted soil was investigated. The effects of bentonite content, water content,dry
density and hydraulic graiient on the hydraulic conductivity were studied in detail. For
the laterite and the laterite with 8% of bentonite, the experimental results of hydraulic
conductivity can be applied in the engineering design. However, for the loess and the
bentonite enhanced loess, those of hydraulic conductivity can not be directly applied in
the engineering design because their hydraulic performance does not comply with the Darcy’s
law. These experimental results have to be carefully modified before application.

Key words: bentonite, loess, laterite, hydraulic conductivity, compressive strength, hydraulic gradient