Rapid increase in urbanization of many cities throughout the world leads to the generation of large amount of municipal solid waste (MSW). The conventional and engineered landfill systems are used, generally, to dump or dispose those wastes. However, currently practiced landfill system needs to be upgraded to accommodate the bulk amount of waste materials and to transfer the concept from storage/containment to a process-based approach, i.e., by constructing bioreactor landfill system. The major concept of bioreactor landfill is to discompose and stabilize the solid waste by the re-circulating the generated leachate, which creates a more favorable environment for the biological decomposition of organic matter in the landfill, also increase an effective refuse density, landfill capacity, and rate of gas production, and reduce overall cost. However, the accelerated degradation of the refuse in bioreactor landfills also considerably changes the geotechnical characteristics of the waste in the landfill which has a great concern over stability and deformation behavior of landfill. Hence, the present study is aimed to analyze the slope stability of bioreactor landfill with time and decomposition using 2D FEM PLAXIS program. Further, various parameters such as slope geometries (i.e., layers, uniform and non-uniform slopes and their angles, number and varying of width of benches, etc.) are considered to examine the factor of safety at each stage of decomposition using c-Phi reduction method. Based on analyses, FoS value increases with decrease in slope angles. It has been observed that FoS of landfill slope having number of bench/step is higher as compared to the same with uniform slope. However, stability of landfill reduces with decrease in value of c-Phi of each phase of different layers. Further, higher slope angle, width of benches, and decomposition stages in each layers have pronounced significant influence in reduction in FoS of bioreactor landfill system.
Influence of Slope Geometry on Stability of Bioreactor Landfills—A Numerical Analysis
Lecture Notes in Civil Engineering
Indian Geotechnical Conference ; 2021 ; Trichy, India December 16, 2021 - December 18, 2021
2022-12-11
14 pages
Article/Chapter (Book)
Electronic Resource
English
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