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.
Highlights
A high-density polyethylene (HDPE) geomembrane is a waterproof barrier material with a high strength made of a polyethylene resin with a specific formula and further processing [1]
The friction of the interface between the HDPE geomembrane and the solid waste under direct shear must be well considered to assess the stability of engineering structures [7,8,9,10,11]
Under the condition of high normal stress (150 kPa and 200 kPa), the lateral friction resistance between the bumps on the surface of the rough geomembrane and the packing particles is more fully played the increase of the interfacial shear strength was much higher for the rough geomembrane than for the smooth one for a large normal stress, shear strength and the fracture performance are significantly improved in the rough geomembrane
Summary
A high-density polyethylene (HDPE) geomembrane is a waterproof barrier material with a high strength made of a polyethylene resin with a specific formula and further processing [1]. It is widely used for the anti-seepage engineering of various domestic and solid waste residues because of its good resistance to low temperatures and good corrosion resistance [2,3,4,5,6]. The HDPE geomembrane is a ductile material in contact with solid waste, clay, concrete or sand on both sides and most of the geomembrane is laid on a slope [13,14,15,16].
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