Hydraulic conductivity of bentonite-sand mixtures

Sivapullaiah, PV and Sridharan, A and Stalin, VK (2000) Hydraulic conductivity of bentonite-sand mixtures. In: Canadian Geotechnical Journal, 37 (2). pp. 406-413.

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Abstract

The use of bentonite alone or amended with natural soils for construction of liners for water-retention and waste- containment facilities is very common. The importance of bentonite content in reducing the hydraulic conductivity of liners is well recognised. The study illustrates the role of the size of the coarser fraction in controlling the hydraulic conductivity of the clay liner. It has been shown that at low bentonite contents the hydraulic conductivity of the liner varies depending on the size of the coarser fraction apart from clay content. At a given clay content, the hydraulic conductivity increases with an increase in the size of the coarser fraction. But when the clay content is more than that which can be accommodated within the voids of the coarser fractions, the hydraulic conductivity is controlled primarily by clay content alone. Four different methods of predicting hydraulic conductivity of the liners are presented. Using two constants, related to the liquid limit, the hydraulic conductivity can be predicted at any void ratio.

Item Type:	Journal Article
Publication:	Canadian Geotechnical Journal
Publisher:	National Research Council Canada
Additional Information:	Copyright of this article belongs to National Reasearch Council Canada.
Keywords:	clays;hydraulic conductivity;liquid limit;liners;void ratio
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	08 Oct 2004
Last Modified:	30 Nov 2011 06:55
URI:	http://eprints.iisc.ac.in/id/eprint/1815

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