Physical Response of Geomembrane Wrinkles near GCL Overlaps

Results from physical experiments are reported to quantify the deformations of geomembrane wrinkles near overlaps in an underlying geosynthetic clay liner (GCL) when subjected to vertical overburden pressure. The height and width of the wrinkle decreased, but a void remained between the geomembrane and GCL when subjected to a vertical pressure of 250 kPa. It was found that the deformation of the geomembrane wrinkle was not significantly altered by the presence of the overlap and that for the conditions tested there was no discernable opening of the GCL overlap when subjected to stress. It is anticipated that the proximity and orientation of the geomembrane wrinkle relative to the GCL overlap and the stress conditions arising from the deforming wrinkle can influence the hydraulic performance of the GCL overlap.