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dc.contributor.author Dixon, DA
dc.contributor.author Graham, J
dc.contributor.author Gray, MN
dc.date.accessioned 2007-09-07T19:07:01Z
dc.date.available 2007-09-07T19:07:01Z
dc.date.issued 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.identifier.uri http://hdl.handle.net/1993/2792
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
dc.rights No part of the NRC Research Press electronic journals may be reproduced, stored, or transmitted in any form or by any means, without the written permission of the publisher, except as stated below. Under the Canadian Copyright Act, individuals may download or print single copies of articles for personal research or study. Any person may reproduce short excerpts from articles in the journals for any purpose that respects the moral rights of authors, provided that the source is fully acknowledged. As a courtesy, the consent of authors of such material should be obtained directly from the author. Authorization to reproduce items for other than personal research or study, as stated above, may be obtained via Access © upon payment of the copyright fee of $10.00 per copy. NRC Research Press also extends certain additional rights to authors. The above rights do not extend to copying or reproduction for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. For such copying or reproduction, arrangements must be made with NRC Research Press. en
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
dc.identifier.doi http://dx.doi.org/10.1139/t99-057


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