Modeling elasto-visco-bio-plastic mechanical behavior of municipal solid waste in landfills
- PDF / 1,415,890 Bytes
- 21 Pages / 595.276 x 790.866 pts Page_size
- 119 Downloads / 188 Views
(0123456789().,-volV)(0123456789().,-volV)
RESEARCH PAPER
Modeling elasto-visco-bio-plastic mechanical behavior of municipal solid waste in landfills Girish Kumar1 • Krishna R. Reddy1
•
Craig Foster1
Received: 18 May 2020 / Accepted: 12 September 2020 Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This paper presents a mechanical model for the prediction of short-term and long-term settlement of municipal solid waste in landfills. The load-induced volumetric compression, shear behavior, tensile behavior, and the time-dependent creep compression behavior of the waste are modeled using the soft soil creep model. The compression induced by decomposition of waste is modeled based on the phenomenon of wetting-induced strains observed in compacted fills with expansive soils. The proposed model is validated using benchmark datasets obtained from two long-term laboratory experiments performed on waste samples obtained from a landfill in UK. Two additional numerical simulation cases (CONV—without leachate injection and BIOR—with leachate injection) were examined by application of the proposed mechanical model on a typical full-scale landfill cell geometry to determine the spatial and temporal variation in the short-term and long-term settlement characteristics of waste in the simulated landfill cell. The settlement of waste predicted by the model could capture the key mechanisms of short- and long-term waste settlement in landfills. The leachate injection in BIOR simulation enhanced the rate of depletion of the degradable solids resulting in a significant increase in the waste settlement. For the simulated landfill and waste conditions, the biodegradation-induced settlement contributed to more than 90% of the settlement of the waste in both CONV and BIOR simulations. The distribution of the injected leachate had a considerable influence on the settlement profiles observed within the waste. Keywords Biodegradation Bioreactor landfill Soft soil creep Viscoplasticity Waste settlement
1 Introduction The behavior of municipal solid waste in landfills is influenced by the complex coupled interactions of different phenomena which mainly include hydraulic (e.g., transport of pore fluids), mechanical (e.g., deformation and related stresses), biochemical (e.g., microbially mediated degradation) and thermal processes (e.g., heat generation from waste degradation, transient temperature changes). For a & Krishna R. Reddy [email protected] Girish Kumar [email protected] Craig Foster [email protected] 1
Department of Civil, Materials, and Environmental Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607, USA
realistic and accurate prediction of the long-term performance of a landfill, it is imperative that these coupled processes and their interdependencies are understood accurately and mathematically interpreted as realistically as possible. Operators of existing landfills and of those landfills that are under post-closure care are generally interested in quantifying
Data Loading...
