Investigation of the PVC Geomembrane-Sand Interface Behaviour using the Discrete Element Method (DEM)

Abstract

Synthetic polymer-based geosynthetics are widely preferred construction materials in geotechnical engineering for their effectiveness in reinforcing soil structures, controlling erosion, and improving drainage systems. They have many applications, such as landfills, footings, retaining walls, tunnels, and ponds. A detailed examination of their interaction with surrounding surfaces is necessary for geosynthetics to function correctly. This investigation investigates interface shear behaviour between polyvinyl chloride (PVC) geomembrane and granular soil. A 1.5- and 3.0-mm thick PVC geomembrane is tested using a cylindrical direct shear test (DST) via the discrete element method (DEM) using a shear box specimen chamber (radius: 52 mm, height: 75 mm). The experiments were first carried out with only the granular soil type; the soil's shear strength and internal friction angles were obtained. The lower jaw of the shear box was filled with a concrete block, and the geomembrane was then placed on the block surface. By putting soil in the upper jaw of the shear box, the soil–geomembrane contact was defined as the shear surface. The testing program included normal stresses of 12.5, 25, and 50 kPa combined with shear rates of 0.5, 1, and 2 mm/s to evaluate geomembrane behavior. According to DEM simulations, the interface friction angle of PVC–soil with a 1.5 mm thickness is 49%, 53.6%, and 58.2% lower than that of granular soil tested under shear rates of 0.5, 1, and 2 mm/s, respectively. For a thickness of 3.0 mm, the corresponding reductions are 47.7%, 51.2%, and 55.8%. These results, which ranged from one-third to two-thirds of the friction angle, were considered reasonable. Also, the results show that the change in shear rate has a minimal effect on the interface friction angle compared to what is observed in laboratory experiments.

Keywords

• Discrete Element Method (DEM)
• geomembrane
• geosynthetic
• polyvinyl chloride (PVC)
• shear behaviour.

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