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The Drained Strength of Bentonite Enhanced Sand

By L.H. Mollins, D.I. Stewart and T.W. Cousens


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

Publisher: Thomas Telford
Year: 1999
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