Thickness and Hydraulic Performance of Geosynthetic Clay Liners Overlying a Geonet |
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Authors: | S. Dickinson R. W. I. Brachman R. Kerry Rowe |
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Affiliation: | 1Manager of Engineering, TerrAtlantic Engineering Limited, 515 Beaverbrook Ct., Fredericton NB, Canada E3B 1X6. E-mail: simon@terratlantic.nb.ca 2Associate Professor, GeoEngineering Centre at Queen’s-RMC, Queen’s Univ., Ellis Hall, Kingston ON, Canada K7L 3N6 (corresponding author). E-mail: brachman@civil.queensu.ca 3Professor, GeoEngineering Centre at Queen’s-RMC, Queen’s Univ., Ellis Hall, Kingston ON, Canada K7L 3N6. E-mail: kerry@civil.queensu.ca
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Abstract: | Experimental results from physical testing are reported to examine the thickness and hydraulic performance of three geosynthetic clay liners (GCLs) overlying a geonet when subjected to vertical stresses (e.g., as may be found in a secondary leachate collection layer or hydraulic control layer in solid waste landfills). The GCL was found to intrude into the underlying geonet and the effects of GCL type and water content, temperature, applied pressure, and test duration on the final GCL thickness are examined. The results are consistent with GCL deformation from the beneficial consolidation of bentonite as opposed to lateral extrusion of bentonite. Results from fixed ring flow tests suggest that the indentations in the GCL caused by intrusion into the underlying geonet do not appear to negatively impact the hydraulic performance (permittivity or resistance to internal erosion) of the particular GCLs tested for the conditions examined. The flow capacity of the geonet in these tests was found to depend not only on the amount of GCL intrusion but also on the orientation of the geonet relative to the flow direction. |
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Keywords: | Clay liners Linings Landfills Geosynthetics |
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