Abstract
Geomembrane liner is an important part of a landfill system that must be selected and installed properly to avoid high induced stresses and imperfections. Considering a fixed HDPE liner thickness of 2mm and variable masses in this study, the liner was modelled and simulated for 27 scenarios using Solidworks and Artificial Neural Networking approach. Static analysis was further performed on the Solidworks model under a distributed load of 4000kg in properly aligned and improperly aligned conditions to the base and side walls of a landfill system. The minimum stress and width of imperfection obtained from the Solidworks simulation was 77MPa and 34mm while 65MPa and 67mm was obtained from the ANN simulation. The liner failed outrageously in the improperly aligned condition with maximum induced stress of 3,606.521MPa, but no sign of failure was observed for the properly aligned condition which the maximum stress (0.018Mpa) was quite low. This investigation can serve as a guide towards proper installation of geomembrane liners for optimum performance in landfill applications.Keywords: Solid waste, engineered landfill, Geomembrane liner, Installation
Highlights
Settlement, improper compaction, bad design and/or choice of materials, geo-technical failure, uncontrolled groundwater infiltration, instability of the sub-grade both slope and basal heave, increase in hydraulic conductivity due to interaction with leachate
Design variables specified by Environmental Protection Agency for the design, operation and rehabilitation of landfills were employed as inputs for the Geomembrane Liner models developed with Artificial Neural Network (ANN) and Solidworks
It was assumed that the load which is evenly distributed across the geomembrane containment represents the lateral and tensile forces acting on the geomembrane liner
Summary
Settlement, improper compaction, bad design and/or choice of materials, geo-technical failure, uncontrolled groundwater infiltration, instability of the sub-grade both slope and basal heave, increase in hydraulic conductivity due to interaction with leachate. Improper contact between the bottom liner (such as folded area in the liner) and the compacted bottom soil can result in imperfections that may accelerate the rate of leakage through deteriorated areas of the bottom liner. Under such conditions, the leachate can spread across the compacted soil layer and seep into the ground to contaminate ground water (Kocasoy and Curi, 1995; Loo et al, 2018; Blight, 2008). HDPE liner was modelled and simulated to determine optimum operation parameters and installation techniques for engineered landfill application
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