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In the following publication results from overlap testing of polyethylene(PE) coated geosynthetic clay liners (GCL) are presented and discussed. A permeation can only occur through the overlaps. Overlaps were tested with a width of 300 mm and 150 mm. The wider overlaps did not show any permeation at all, however minor permeation was detected with the 150 mm wide overlaps. Additionally a series of overlaps were performed by taping the overlaps with a 50 mm wide tape. The overlapped GCL was 150 mm and 75 mm. Under these test conditions no permeation was detected. Further the research was carried out with perforated holes in the PE coating. In this case the water distribution in the area of the hole(s) was investigate. Aim of this study was to better understand the permeation in the overlap area as well through perforated holes.
Overlap, geosynthetic clay liners, coating, perforation, permeation, permeability
Egloffstein, T. A.
ICP, Ingenieurgesellschaft mbH, Karlsruhe,
Head of Soil Mechanical Laboratory, ICP, Ingenieurgesellschaft mbH, Karlsruhe,
von Maubeuge, K. P.
NAUE Fasertechnik GmbH and Co., Espelkamp-Fiestel,
Quality Management, NAUE GmbH and Co., Espelkamp-Fiestel,