Abstract
The purpose of this research is to extend the database for interface friction values of the various components of cap and liner systems for proper landfill design with special emphasis on friction under low to moderate normal loads. This relates to periods of cap and liner system construction and long-term cap system stability. Interface friction parameters are presented for three soil types including a conventional sand, kaolinite clay and fly ash; five geotextiles including monofilament, multifilament and slit film wovens, and heatbonded and needlepunched nonwovens: one flexible geogrid; five geomembranes including high density polyethylene (HDPE) with smooth and roughened surfaces, a very low density polyethylene (VLDPE), a chlorosulphonated polyethylene (CSPE) and a polyvinyl chloride (PVC); and one geonet. The various interfaces tested correspond with a typical landfill cross-section. The interface friction results are presented for 71 various interfaces that may exist within a landfill cap or liner system. Finally, detailed descriptions of the method and equipment of the modified direct shear device, as well as a conclusive summary of the analytical results and their pertinence in design are discussed.
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