Constitutive model for long term municipal solid waste mechanical behavior

Machado, Sandro Lemos; Vilar, Orêncio Monje; Carvalho, Míriam de Fátima

doi:10.1016/j.compgeo.2007.11.008

Cited by 96 publications

(36 citation statements)

References 8 publications

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“…2b shows the variation of the water content with age in these landfills. According to Machado et al (2002Machado et al ( , 2008, the mechanical response of MSW materials under static loading is governed mainly by the fibrous elements and the paste, which acts as a medium to hold the fibrous part, generating a reinforcement reaction. The plastic component is usually referred to as the MSW fibrous elements and it is responsible for the upward concavity of the MSW shear stress-strain curves.…”

Section: Water Content Determinationmentioning

confidence: 99%

“…Clark (1986, 1990) were pioneers in waste mechanics and they carried out several research projects to form a sound engineering basis for stability analysis of landfills. Jessberger and Kockel (1993), Gabr and Valero (1995), Grisolia et al (1995), Kölsch (1995), Kavazanjian et al (1995), Grisolia and Napoleoni (1996), Manassero et al (1996), Mahler et al (1998), Mazzucato et al(1999), Kavazanjian (1999), Carvalho (1999), Pelkey et al (2001), Machado et al (2002Machado et al ( , 2008, Caicedo et al (2002a,b), Mahler and De Lamare Netto (2003), Xiang-rong et al (2003), Vilar and Carvalho (2004), Towhata et al (2004), Zekkos (2005), Nascimento (2007), Reddy et al (2009a,b), Karimpour-Fard (2009) and Shariatmadari et al (2009), are among the researchers in the field of waste mechanics who have tried to provide a clearer vision of the mechanical behavior of MSW materials. In spite of these valuable contributions there remain a number of issues in waste mechanics for which complementary studies are required.…”

Section: Introductionmentioning

confidence: 95%

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Evaluation of the geotechnical properties of MSW in two Brazilian landfills

et al. 2010

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The characteristics of municipal solid waste (MSW) play a key role in many aspects of waste disposal facilities and landfills. Because most of a landfill is made up of MSW, the overall stability of the landfill slopes are governed by the strength parameters and physical properties of the MSW. These parameters are also important in interactions involving the waste body and the landfill structures: cover liner, leachate and gas collection systems. On the other hand, the composition of the waste, which affects the geotechnical behavior of the MSW, is dependent on a variety of factors such as climate, disposal technology, the culture and habits of the local community. It is therefore essential that the design and stability evaluations of landfills in each region be performed based on the local conditions and the geotechnical characteristic of the MSW. The Bandeirantes Landfill, BL, in São Paulo and the Metropolitan Center Landfill, MCL, in Salvador, are among the biggest landfills in Brazil. These two disposal facilities have been used for the development of research involving waste mechanics in recent years. Considerable work has been made in the laboratory and in the field to evaluate parameters such as water and organic contents, composition, permeability, and shear strength. This paper shows and analyzes the results of tests performed on these two landfills. The authors believe that these results could be a good reference for certain aspects and geotechnical properties of MSW materials in countries with similar conditions.

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Section: Water Content Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Evaluation of the geotechnical properties of MSW in two Brazilian landfills

et al. 2010

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“…The first adopts the theory of non-linear elasticity and has been used in the elastic-hyperbolic model (Filz et al, 2001;Reddy et al, 1996;Singh and Fleming, 2011;Singh et al, 2009), the composite exponential model (Chen et al, 2009) and others. The second is based on the theory of elasto-plasticity and has been used in the hydrobiomechanical multi-field coupling model (McDougall, 2007), the creep and biodegradation elasto-plastic model (Babu et al, 2010), the reinforced composite material model (Machado et al, 2008;Zhang, 2008) and others. Existing non-linear elastic models, which are relatively simple in forms and convenient for engineering applications such as stability analyses of linear systems (Reddy et al, 1996) and failure analyses of lined waste impoundments (Filz et al, 2001), are usually based on the generalised incremental Hooke's law.…”

Section: Introductionmentioning

confidence: 99%

Non-linear elastic model for MSW considering dilatancy effect

KeHan

ChenYun-min

DongDing

et al. 2019

Environmental Geotechnics

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Study of the stress-strain behaviour of municipal solid waste (MSW) is important in landfill design and management. Non-linear elastic constitutive models are usually in a simple form and convenient in engineering applications; however, most existing non-linear elastic models do not adequately consider the dilatancy behaviour, which has a significant influence on the strength and deformation behaviours of MSW. In this paper, a non-linear elastic model for the prediction of stress-strain behaviour of MSW is proposed based on the results of consolidated drained triaxial compression tests. The influence of dilatancy behaviour is identified and highlighted. The generalised shear stress can be normalised well by dividing the shear stress by the power function of the mean normal stress. Total expressions of normalised volumetric strain and generalised shear strain were established, and the dilatancy modulus and hardening modulus of the proposed model were obtained. The proposed model was used to simulate test results obtained from both published studies and the authors' laboratory testing. The simulation results were in good agreement with the experimental values in general, although deviations were observed in the simulations of volumetric strain or shear stress for the high-dispersion characteristics of MSW. Notation

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“…Several parameters were used to characterize the biochemical compression of MSW in numerous proposed models in literature and include: the strain-based biochemical compression ratio ( ′ ) (Bjarngard and Edgers 1990;Lamothe and Edgers 1994;Wall and Zeiss 1995;Hossain et al 2003;Benson et al 2007;Olivier and Gourc 2007;Sharma and De 2007;Ivanova et al 2008;Bareither 2010;Bareither et al 2010;Bareither et al 2012b), biochemical strain potential (E DG ) (Park and Lee 1997;Marques et al 2003), rate constant for biological decomposition (d) (Park and Lee 1997;Marques et al 2003;Liu et al 2006;Oweis 2006;Hettiarachchi et al 2009;Bareither et al 2013), and the gas generation rate constant ( ) (Durmusoglu et al 2005;Machado et al 2008;Gourc et al 2010).…”

Section: Biochemical Compressionmentioning

confidence: 99%

“…Later, Park and Lee (1997), Marques et al (2003) and Hossain and Gabr (2005) proposed settlement models that incorporated timedependent biodegradation of waste. Modeling biochemical compression as a function of the solid-to-gas conversion of waste and gas generation due to MSW decomposition is another common approach (Durmusoglu et al 2005;Oweis 2006;Liu et al 2006;Machado et al 2008;Gourc et al 2010). …”

Section: Biochemical Compressionmentioning

confidence: 99%

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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Constitutive model for long term municipal solid waste mechanical behavior

Cited by 96 publications

References 8 publications

Evaluation of the geotechnical properties of MSW in two Brazilian landfills

Evaluation of the geotechnical properties of MSW in two Brazilian landfills

Non-linear elastic model for MSW considering dilatancy effect

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

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