August 6, 2021

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Girish Kumar Coauthored a Paper on "Modeling elasto-visco-bio-plastic mechanical behavior of municipal solid waste in landfills" in the Acta Geotechnica

Girish Kumar (California) coauthored a paper entitled "Modeling elasto-visco-bio-plastic mechanical behavior of municipal solid waste in landfills" published in the Acta Geotechnica on pages 1061–1081 in Volume 16, Issue 4 in April 2021.

Girish was the lead author, and his coauthors were Krishna R. Reddy and Craig Foster.

Girish Kumar is a Senior Staff Professional based in California with a focus on site assessment and remediation consulting. He has academic and research experience in geotechnical and geoenvironmental engineering, including landfill design and analysis; environmental remediation; numerical modeling and analysis of geosystems; and life cycle assessment and sustainability quantification. Girish has published over 40 research articles and his work has been recognized by several professional organizations including the American Society of Civil Engineers (ASCE), Environmental Research and Education Foundation (EREF), Solid Waste Association of North America (SWANA), and Air & Waste Management Association (A&WMA).

Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering.


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.

More Information

Learn more about the article: Modeling elasto-visco-bio-plastic mechanical behavior of municipal solid waste in landfills | SpringerLink
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