Shear Testing of the Interfacial Friction Between an HDPE Geomembrane and Solid Waste

Abstract

High-density polyethylene (HDPE) geomembrane is often used as an anti-seepage material in domestic and industrial solid waste landfills. To study the interfacial shear strength between the HDPE anti-seepage geomembrane and various solid wastes, we performed direct shear tests on the contact interface between nine types of industrial solid waste or soil (desulfurization gypsum, fly ash, red mud, mercury slag, lead-zinc slag, manganese slag, silica fume, clay and sand) and a geomembrane with a smooth or rough surface in Guizhou Province, China. Friction strength parameters like the interfacial friction angle and the apparent cohesion between the HDPE geomembrane and various solid wastes were measured to analyze the shear strength of the interface between a geomembrane with either a smooth or a rough surface and various solid wastes. The interfacial shear stress between the HDPE geomembrane and the industrial solid waste increased with shear displacement and the slope of the stress-displacement curve decreased gradually. When shear displacement increased to a certain range, the shear stress at the interface remained unchanged. The interfacial shear strength between the geomembrane with a rough surface and the solid waste was higher than for the geomembrane with a smooth surface. Consequentially, the interfacial friction angle for the geomembrane with a rough surface was larger. The geomembrane with a rough surface had a better shear resistance and the shear characteristics fully developed when it was in full contact with the solid waste.

Effects of soil and geomembrane types on interface and shear strength behaviour

“…Direct shear tests were performed under normal stresses of 12.25, 24.5, 49, 98, 196, 392 and 784 kPa. The experiments were performed at a shear rate of 0.5 mm/min because the permeabilities of CS, CG, RS, and RG were very high, and 0.1 mm/min because the permeability of SB was low [22,[32][33].…”

Operational risk management – Measurement and evaluation of friction coefficients for geotextile sandbags for flood protection

“…Several test results accomplished at the University of Manitoba (Geotechnical Laboratories) for ‘black’ and ‘white’ geotextile sandbags with friction coefficients of 0.40 to 0.49 were assumed [12]. In addition, several further investigations with other surface materials like polyethylene are available [13].…”

Research on the interface characteristics of coal gangue with different geosynthetic reinforcements

“…Including geogrids reduced the shear strength of gravel aggregates and the interface. Through direct shear tests, ZHOU et al [17], documented that the interfacial shear stress between HDPE geomembranes and industrial solid waste increased in correlation with the enhancement of shear displacement. The gradient of the stress-displacement curve showed a gradual decline.…”