A finite-volume numerical model for bio-hydro-mechanical behaviors of municipal solid waste in landfills. (May 2019)

• Record Type: Journal Article
• Authors: Lu, Shi-Feng; Xiong, Ju-Hua; Feng, Shi-Jin; Chen, Hong-Xin; Bai, Zhen-Bai; Fu, Wen-Ding; Lü, Fan
• Is Part Of: Computers and geotechnics. Volume 109(2019)
• Page Start: 204
• Page End: 219
• Publication Date: 2019-05
• Subjects: Municipal solid waste -- Landfill -- Leachate-gas flow -- Consolidation -- Finite volume method; Engineering geology -- Data processing -- Periodicals; Soil mechanics -- Data processing -- Periodicals; Rock mechanics -- Data processing -- Periodicals; 624.1510285
• DOI: 10.1016/j.compgeo.2019.01.012
• Languages: English
• ISSNs: 0266-352X

Abstract

Abstract: A bio-hydro-mechanical model is developed to describe interactions between leachate flow, landfill gas flow and waste deformation. The model is developed based on three-phase consolidation theory; and the governing equations are solved by finite volume method. The proposed model is effectively validated by two well-designed laboratory tests. The simulation results for a typical conceptual landfill demonstrate that ignoring the waste consolidation yields a little bit smaller leachate and gas pressures, as well as smaller waste deformation, neglecting landfill gas generation and flow will distinctly underestimate the leachate pressure and then overestimate the effective stress, which may eventually cause slope failure.