Show simple item record Dixon, DA Graham, J Gray, MN 2007-09-07T19:07:01Z 2007-09-07T19:07:01Z 1999-10-31T19:07:01Z
dc.identifier.citation 0008-3674; CAN GEOTECH J, OCT 1999, vol. 36, no. 5, p.815 to 825. en
dc.description.abstract Clay barriers normally function at hydraulic gradients much lower than are commonly used in laboratory tests for hydraulic conductivity. This paper describes low-gradient tests on compacted illite, Na-bentonite, and sand-bentonite specimens at a range of dry densities. The tests examined the effects of deionized or saline pore fluid, the initial degree of saturation at the time of compaction, and back-pressuring to achieve saturation during permeation. No "critical" or "threshold" gradients were observed. In low-density materials, "transitional" gradients de-fined two separate regions of Darcian flow. Low flow rates and low hydraulic conductivities were associated with hydraulic gradients below the transitional gradient. Higher conductivities were associated with gradients above the transitional gradient. Hydraulic conductivities decreased with increasing initial density. They appeared independent of initial degree of saturation or back-pressuring. Tests on Na-rich bentonite showed that deionized and saline permeants produced similar hydraulic conductivities. Measured hydraulic conductivities were in reasonable agreement with values computed using the Poiseuille and Kozeny-Carman equations. en
dc.format.extent 666193 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
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dc.rights info:eu-repo/semantics/restrictedAccess
dc.subject hydraulic conductivity en
dc.subject gradient en
dc.subject Darcian en
dc.subject illite en
dc.subject bentonite en
dc.subject FLOW en
dc.title Hydraulic conductivity of clays in confined tests under low hydraulic gradients en
dc.status yes en

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