Damage to HDPE Geomembrane from Interface Shear with Gravel Drainage Layer and Protection Layer

摘要

Bottom liner systems for landfills and other waste containment facilities often include a gravel drainage layer and protection layer overlying a geomembrane. The protection layer can be made of different materials but is typically a nonwoven geotextile, as first proposed by Giroud in 1971 for several geomembrane-lined reservoirs (Giroud 1973). Extensive research has been conducted over the last 20 years to assess the performance of geomembrane protection layers using static pressure tests. However, this work has not accounted for possible additional geomembrane damage that can occur when static pressure is combined with interface shear. Shear displacements can be expected within liner systems, especially on or near side slopes, due to various mechanisms including waste settlement, seismic loading, and strength mobilization for stability.