Abstract
As a product of polymeric materials, geomembranes (GMs) are widely used in engineered systems as impervious barriers due to their low permeability. In this study, a large-scale composite shear test apparatus was developed to investigate the shear behaviors of various GM interfaces. A series of direct shear tests were conducted on GM–soil, GM–geotextile, and GM–concrete interfaces. Two types of high-density polyethylene (HDPE) GMs, a smooth GM and a textured GM, were used to evaluate the effect of GM-texturing on the shear properties of these interfaces. Based on the experimental data, the friction angles and adhesions of GM interfaces were calculated using the Mohr–Coulomb criterion. Test results describing the behavior of GM–soil and GM–geotextile interfaces from the current study were then compared with results from previous studies. The test results are shown to verify the reliability of the new large-scale composite shear apparatus. In addition, this paper presents preliminary experimental results of the GM–concrete interface shear tests.
Highlights
As a product of polymeric materials, geomembranes (GMs) are widely used in the environmental, geotechnical, hydraulic, and transportation sectors as barrier layers with low permeability, e.g., landfill basal liners or capping [1], tailings ponds, or leaching ponds in mineral and ore processing, dams or dykes, reservoirs, canal construction, tunnel construction, and large-area contiguous liners in road construction [2]
GM–Soil graduallyInterface decreased to a stable value, while the peak shear stress of the GM(T)–Fine sand (FS) interface rapidly dropped to a residual value where it remained stable under further shear displacement
A large-scale composite shear apparatus was developed and a series of monotonic shear tests were conducted on various types of GM interfaces
Summary
As a product of polymeric materials, geomembranes (GMs) are widely used in the environmental, geotechnical, hydraulic, and transportation sectors as barrier layers with low permeability, e.g., landfill basal liners or capping [1], tailings ponds, or leaching ponds in mineral and ore processing, dams or dykes, reservoirs, canal construction, tunnel construction, and large-area contiguous liners in road construction [2]. These GM barriers can effectively minimize the penetration of liquids into the engineered systems. The accurate assessment of the shear strength of GM interfaces is necessary, and laboratory tests can provide an effective means to evaluate the shear behavior of GM interfaces
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