Abstract
The findings from an investigation of GCL overlap for a GCL constructed as part of a 55 m long (3H:1V) composite side liner for a landfill cell after 18 months exposure in Melbourne Australia are reported. It is concluded that the nominated minimum overlap of 300 mm was appropriate to achieve the design intent for the particular GCL examined. It is also concluded that for the exposure to which the GCL was subjected, the particular GCL experienced 50–80 mm of shrinkage during 18 months of exposure when the geomembrane was covered by a 5 mm thick off-white geotextile protection layer.
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