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    Lamination effect on flow rates through composite liners
    (Deutsche Gesellschaft fur Geotechnik e.V., 2014) Güler, Erol; Özhan, Hakkı; Cengiz, Cihan
    In this study, the hydraulic conductivity characteristics of laminated versus unlaminated composite liner systems were compared. For this purpose, a flexible-wall permeameter was used and hydraulic conductivity tests were performed. A 6 and 0.75 mm diameter hole in the middle of the laminated geomembrane (GM) was created on the geocomposite produced by a GM laminated to a geosynthetic clay liner (GCL). The other geocomposite was produced by simply placing the same GM on the same GCL without lamination. In order to compare the effect of hydraulic heads and effective stress, the GCLs were tested under hydraulic heads of 0.75 m and 1.5 m and effective stresses of 35 kPa, 140 kPa and 280 kPa. According to the results, lamination did not have a significant effect on the hydraulic properties of the geocomposites in the laboratory scale. Increasing effective stress and decreasing hydraulic head caused little decrease in flux of the geocomposites. Defect size also did not have a significant effect on hydraulic conductivity.