INTRODUCTION
Barriers with a low hydraulic conductivity are used
as part of waste containment systems to prevent
groundwater contamination by liquids from the
waste. Commonly barriers are either a geomembrane
(usually an HDPE sheet), a mineral layer or
a combination of the two. Recently there has been
increasing interest in the use of bentonite±sand
mixtures as the mineral layer, in both land®ll liners
and vertical cut-off walls, partly because they are
less susceptible to frost damage and desiccation
cracking than compacted clay (Dixon et al., 1985;
Kraus et al., 1997). Currently there is uncertainty
about the strength and bearing capacity of these
materials. This note reports drained strength data
for bentonite±sand mixtures and proposes that
trends in these data are mainly the result of variations
in the relative density of the sand
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