"PRELIMINARY ASSESSMENT OF THE PHYSICAL RESPONSE OF A DOUBLE COMPOSITE LINER"
By: Ali Sabir
GeoEngineering Centre at Queen’s–RMC, Queen’s University
Kingston, Ontario, Canada
Results are presented from a large-scale laboratory test conducted to simulate the physical response of a double composite landfill liner. The test was conducted in a 2 m x 2 m x 1.6 m test cell. Vertical pressures up to 350-kPa were applied using a rubber bladder and horizontal stresses were developed by limiting deflection of the sidewalls. Friction treatment was used to reduce boundary friction effects. A wrinkle was formed in the primary geomembrane to study potential scale effects on the resulting deformations of the wrinkle. Wrinkle deformations, soil pressures, clay settlement and gravel indentation strains in the primary and secondary geomembrane were measured. The maximum tensile strains in the primary geomembrane were 9% whereas in the secondary geomembrane strains were about 18% at a pressure of 350-kPa, both exceeding allowable limits. The wrinkle response followed the same trends as that found from tests conducted in a smaller 0.59-m-diameter test cell.