Abstract
Twenty-one transmissivity tests were performed in a double composite liner contaminant barrier for landfills. The secondary drainage system was tested with three geocomposite drains with different geonet core structures, biplanar, triplanar, and triaxial. Half of the tests were conducted under normal applied load of 250 kPa and varying temperatures of 30, 65, 75 and 85oC, to simulate different temperatures commonly found in the liner. The other half was performed at 30oC and varying applied stresses of 50, 150, 250 and 350 kPa, to simulate different heights of waste on top of the liner. The triaxial and triplanar GCDs presented similar but higher than the biplanar, rate of decrease in the flow rate with increasing temperature at 250 kPa. The highest the temperature of the liner, the smallest the flow rate of the geocomposite drain, but with a faster rate between 30-65oC than between 65-85oC.
Published Version
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