EPA Science Inventory

HYDRAULIC CONDUCTIVITY OF THREE GEOSYNTHETIC CLAY LINERS

Citation:

Estornell, P. AND D. E. Daniel. HYDRAULIC CONDUCTIVITY OF THREE GEOSYNTHETIC CLAY LINERS. J.P. Stewart (ed.), Journal of Geotechnical Engineering. American Society of Civil Engineers (ASCE), Reston, VA, 118(10):1592-1606, (1992).

Description:

The hydraulic conductivity of three 2.9 m2 (32 sq ft) geosynthetic clay liners (GCLs) was measured. Tests were performed on individual sheets of the GCLs, on overlapped pieces of GCLs, and on composite liners consisting of a punctured geomembrane overlying a GCL. Hydraulic conductivities of two of the GCLs were in the range of 10-10 to 10-8 cm/s. No flow was measured through the third GCL, but the conductivity was obviously very low (<<1 10-7 cm/s). The hydraulic conductivities of overlapped GCLs were about he same as those of the control samples with no overlap; an effective hydraulic seal developed along the overlaps in all of the materials tested. Performance of the punctured geomembrane-GCL composites varied---performance was best when the punctured geomembrane was placed directly against bentonite and no geotextile separated the punctured geomembrane from the bentonite. For those GCLs with geotextiles on both sides, problems with migration of bentonite into the underlying drainage layer were encountered when inadequate filtration was provided. However, with a suitable filtration layer separating the drainage layer from the GCL, problems with migration of bentonite were eliminated.

Purpose/Objective:

To develop technical information on the engineering properties of GCLs, to determine the hydraulic properties of GCLs and the overlapped seams, and to evaluate the composite behavior of geomembrane-GCL composite liners.

URLs/Downloads:

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Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 10/01/1992
Completion Date: 10/01/1992
Record Last Revised: 10/09/2008
Record Created: 12/08/2004
Record Released: 04/02/2005
OMB Category: Other
Record ID: 128928

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

LAND REMEDIATION AND POLLUTION CONTROL DIVISION