Evaluation of Decomposition Effect on Long-Term Settlement Prediction for Fresh Municipal Solid Waste Landfills

Park, Hyun Il; Lee, Seung Rae; Young, N.

doi:10.1061/(asce)1090-0241(2002)128:2(107)

Cited by 32 publications

(10 citation statements)

References 8 publications

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“…Bjarngard and Edgers (1990) characterized the biochemical sub-phase using a secondary compression ratio, 2 ′ . Although Bjarngard and Edgers (1990) did not identify the secondary compression ratio as a decomposition-induced parameter, the values obtained from the test program correspond well with more recent laboratory and field studies that identify the secondary compression ratio as a biochemical compression ratio ( ′ ) (e.g., Lamothe and Edgers 1994;Park et al 2002;Hossain and Gabr 2005;Olivier and Gourc 2007;Bareither 2010;Bareither et al 2012b). Edgers et al (1992) were the first to model biologically-induced settlements and expressed biochemical compression as a function of the activity of microorganisms.…”

Section: Biochemical Compressionsupporting

confidence: 79%

“…However, in recent years, more advanced, composite models that account for long term settlements due to biochemical degradation have been utilized to quantify waste settlement (Park et al 2002;Marques et al 2003;Liu et al 2006;Hettiarachchi et al 2009;Babu et al 2010a;Gourc et al 2010;Chen et al 2010a;Krase et al 2011;Chen et al 2012). In this section, the mechanisms of waste settlement are described followed by a summary of relevant models used to predict MSW compression.…”

Section: Compressibility Of Mswmentioning

confidence: 99%

“…Biochemical compression strains of MSW reported in the literature for conventional landfill conditions range from 2 to 10% (Rao et al 1977;Park et al 2002;Hossain et al 2003;Benson et al 2007;Ivanova et al 2008;Swati and Joseph 2008;Bareither et al 2010;Bareither et al 2012b,c) and the strains reported from bioreactor landfill conditions range from 6 to 23% (Lamothe and Edgers 1994;Hossain et al 2003;Benson et al 2007;Ivanova et al 2008;Swati and Joseph 2008;Bareither et al 2010;Bareither et al 2012b,c).…”

Section: Biochemical Compressionmentioning

confidence: 99%

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Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste

Cox¹

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Effects of Waste Placement Practices on the Engineering Response of MunicipalSolid Waste Jason T. Cox An extensive laboratory and field investigation was conducted at Santa Maria Regional Landfill (SMRL) in Santa Maria, California to determine the effects of waste placement practices on the engineering response of municipal solid waste (MSW). Laboratory and field testing was used to determine the engineering properties and monitor field response of MSW.The specific gravity (G s ) of manufactured MSW (MMSW), fresh MSW (FMSW), and old MSW (OMSW) was determined experimentally using a modified version of standard soil testing procedures. Effects of particle size, compactive effort, and degradation on the specific gravity of waste were evaluated. Specific gravity of manufactured waste samples increased with decreasing particle size, with compaction, and with increased degradation. The average specific gravity of uncompacted MMSW samples was 1.333, 1.374, and 1.424 for coarse, medium, and fine particle sizes, respectively. Specific gravity of coarse, medium, and fine MMSW samples compacted at dry of optimum ( = 30%) was determined to be 1.497, 1.521, and 1.552, respectively and at wet of optimum ( = 90%) to be 1.500, 1.542, and 1.570, respectively. The compacted and uncompacted specific gravity of fresh MSW was lower than manufactured and old MSW. The average G s of uncompacted and compacted fresh MSW was 1.072 and 1.208, respectively whereas old MSW had G s of 2.201.v Additional physical and engineering properties of MSW were determined for fresh and old wastes. A total of 8 magnetic extensometer settlement arrays and 4 thermocouple arrays were installed in old wastes. The settlement and temperature data were collected for an approximate duration of 1 year. In addition, laboratory experiments were conducted to determine the particle size distribution, organic content, and moisture content of fresh waste sampled from the active face of the landfill and from old waste sampled from different depths.The particle size distribution of OMSW was comparable to a well-graded coarsegrained soil. The average baseline moisture content of incoming MSW at SMRL was 42.7% (dry-weight basis). The average moisture content of residential MSW, commercial MSW, and self-delivered MSW were determined to be 57.7, 46.3, and 12.0%, respectively. The organic content of fresh and old MSW was determined to be 77.2 and 23.5%, respectively. Temperature increased over time due to heat generation of the waste mass. The temperature increased on average 3 to 6°C between the initial and final day of measurements for wastes that were 0.3 to 9 years old.Fresh and old wastes at SMRL exhibited unique compression behavior. A majority of the waste was undergoing secondary compression characterized using a secondary compression ratio ( ′ ) ranging from 0.013 to 0.067 with an average of 0.030. In addition, the fresh and old wastes exhibited recompression behavior. Fresh waste lifts were determined to be slightly overconsolidated such that the self-weig...

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Section: Biochemical Compressionsupporting

confidence: 79%

Section: Compressibility Of Mswmentioning

confidence: 99%

Section: Biochemical Compressionmentioning

confidence: 99%

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Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste

Cox¹

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“…Various settlement models (Yen andScanlon 1975, Edil et al 1990) are refined when decomposition effects are taken into account (Edgers et al 1992, Lee and Park 1999, El-Fadel and Khoury 2000, Park and Lee 2002.…”

Section: Waste Compressibilitymentioning

confidence: 99%

Investigation of the Geotechnical Properties of Municipal Solid Waste as a Function of Placement Conditions

Wong¹

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shear strength testing over moisture contents ranging from 11% to 110%. Baseline compaction curves were developed for different compactive efforts. Similar to soils, the MMSW had bell shaped compaction curves that peaked at a maximum dry unit weight and associated optimum moisture content. The compaction curve generated at modified compactive effort had a maximum dry unit weight of 5.1 kN/m 3 and optimum moisture content of 66%. Four times modified compactive effort testing resulted in a maximum

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“…Dixon & Jones (2005) provide an overview of relevant engineering properties of municipal solid waste. Simple onedimensional approaches for the primary and the secondary creep phase and the biodegradation, for example Park et al (2002) or Marques et al (2003), are often applied and allow rough prognoses of the long-term development under constant environmental conditions. But, if these conditions change drastically, for instance after construction of a surface cover system or installing a recirculation system for leachate, such models may fail completely.…”

Section: Introductionmentioning

confidence: 99%

Modelling the stress–deformation behaviour of municipal solid waste

Krase¹,

Bente²,

Kowalsky³

et al. 2011

Géotechnique

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Conceptual modelling of municipal solid waste landfills is vital for prognosis of the long-term development and the assessment of risk potential. Landfills are considered as heterogeneous porous structures, in which flow and transport processes of gases and liquids are combined with local material degradation and mechanical deformation of the solid skeleton. This contribution deals with a constitutive model focusing on the mechanical deformation behaviour of the disposed waste dividing the solid material into two different fractions. The first fraction includes more grainy particles and has properties comparable with granular materials. The second fraction consists of more fibrous constituents having an important influence on the strength of the composite material. Stress-strain behaviour of the two fractions is modelled according to the theory of finite elasto-plasticity. Settlements generated by mechanical creep are also included in the model. The developed constitutive model is validated and calibrated on results from laboratory experiments applying genetic algorithms. Numerical analyses using the finite-element method show the capability of the presented approach.La modélisation conceptuelle des décharges de déchets solides municipaux est indispensable pour une établir une prognose du développement à long terme et l'évaluation du potentiel de risques. Les décharges sont considérées comme des structures poreuses hétérogènes dans lesquelles des procédés d'écoulement et de transport de gaz et liquides sont alliées à la dégradation matérielle et à la déformation mécaniques locales du squelette solide. La présente communication se penche sur un modèle constitutif qui se concentre sur le comportement de la déformation mécanique des déchets éliminés, en divisant les matières solides en deux fractions distinctes. La première fraction comprend des particules plus graineuses, dont les propriétés sont similaires à celles des matières granulaires. La deuxième fraction se compose de constituants plus fibreux, qui influent de façon importante sur la solidité du matériau composite. Le comportement tension -déformation des deux fractions est modélisé selon la théorie de l'élastoplasticité finie. En outre, ce modèle tient compte également des tassements produits par fluage mécanique. Le modèle constitutif ainsi créé est validé et calibré d'après des résultats découlant d'expériences en laboratoire, et en appliquant des algorithmes génétiques. Enfin, des analyses numériques effectuées avec la méthode aux éléments finis illustrent la capacité de la méthode présentée.

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Evaluation of Decomposition Effect on Long-Term Settlement Prediction for Fresh Municipal Solid Waste Landfills

Cited by 32 publications

References 8 publications

Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste

Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste

Investigation of the Geotechnical Properties of Municipal Solid Waste as a Function of Placement Conditions

Modelling the stress–deformation behaviour of municipal solid waste

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