Modelling the stress–deformation behaviour of municipal solid waste

Krase, Volker; Bente, Sonja; Kowalsky, Ursula; Dinkler, Dieter

doi:10.1680/geot.8.p.140

Cited by 11 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the geometry of the anchor trench to prevent the sliding of the membrane down a slope was designed according to Koerner and Soong [40] and was also modelled. Several researchers, e.g., [41][42][43][44], have formulated different constitutive models for the mathematical description of the MSW stress-strain relationship recently [45], with various level of accuracy of settlement prediction. Currently, new constitutive models are still being developed by researchers in response to advances in understanding the processes that occur over time in the decomposing MSW.…”

Section: Geotechnical Aspects Of the New Vinča Landfill Projectmentioning

confidence: 99%

Assessment of the Landfill Barrier System through Numerical Analysis: Rehabilitation and Expansion of Belgrade Landfill Case Study

Štefaňák

Chalmovský

2022

Sustainability

View full text Add to dashboard Cite

There are still many unmanaged landfills around the world that pose significant potential environmental problems. One of the largest unmanaged landfills in Europe, which has been used for more than 40 years to deposit waste from Serbia’s capital, Belgrade, is the Vinča landfill. A revitalization and extension of this landfill was proposed that would allow its sustainable operation in the future. The revitalization project considered building a capping layer on the surface of the current landfill, which will close it and which will serve as a liner on the bottom of the new landfill. The use of a composite system including a HDPE geomembrane is considered in the project. New landfill settlements were predicted using the FEM method utilizing a Hardening-soil constitutive model for subgrade. Both immediate settlements of subgrade caused by waste deposition and primary consolidation settlement were calculated. The results show that a substantial increase in the settlement of the geomembrane subgrade can be expected during the primary consolidation period, due to the high rate of filling compared to the permeability of the subgrade. The total settlement of the new landfill in its crown is expected to be between 2.73 and 4.52 m. The axial force in the geomembrane will not exceed the tensile strength of the membrane at any time during or after the new landfill operation.

show abstract

Section: Geotechnical Aspects Of the New Vinča Landfill Projectmentioning

confidence: 99%

Assessment of the Landfill Barrier System through Numerical Analysis: Rehabilitation and Expansion of Belgrade Landfill Case Study

Štefaňák

Chalmovský

2022

Sustainability

View full text Add to dashboard Cite

show abstract

“…The compaction rate is described by the product of two functions, see also Krase et al . . The creep rate in the direction j depends on the Kirchhoff stresses of the basic matrix

{boldT}_{e}^{B}

and on the dry solid bulk density ρ s , i , whereas i denotes the current time step:

{\overset{γ}{true}}_{c r, j}^{B} = f_{1} ((), {boldT}_{e}^{B}) f_{2} ((), ρ_{s, i}, {boldT}_{e}^{B})

f_{1} ((), {boldT}_{e}^{B}) = - A_{c r} {((), \frac{⟨ - {boldT}_{e, j j}^{B} ⟩}{σ_{0}})}^{n_{c r}},

f_{2} ((), ρ_{s, i}, {boldT}_{e}^{B}) = {([], \ln ((), \frac{ρ_{s, \infty}}{ρ_{s, \infty} - ρ_{s, i}}))}^{- p} \cdot \ln {((), \frac{ρ_{s, m a x}}{ρ_{s, i}})}^{p},

ρ_{s, \infty} = b_{c r} ρ_{s, m i n} + (||, {falsefalse}_{\sum}^{j = 1} ⟨ - {boldT}_{e,})

…”

Section: Model For Compaction Including Degradationmentioning

confidence: 99%

“…Compaction is thus triggered both by a change in density and a change in effective stress. The compaction rate is described by the product of two functions, see also Krase et al [45]. The creep rate in the direction j depends on the Kirchhoff stresses of the basic matrix T B e and on the dry solid bulk density s;i , whereas i denotes the current time step: The parameters A cr and n cr control the stress dependency.…”

Section: Model For Compaction Including Degradationmentioning

confidence: 99%

See 1 more Smart Citation

Model for degradation-induced settlements as part of a coupled landfill model

Bente

Krase

Kowalsky

et al. 2017

Int. J. Numer. Anal. Meth. Geomech.

Self Cite

View full text Add to dashboard Cite

Summary This paper deals with a model for time‐dependent compaction of soil‐like porous materials. Although the model is originally developed for degradation‐induced settlements in municipal solid waste landfills, it may be applied to any settlements caused by solid mass loss as well. The presented model is part of a coupled THMC model, that is, a model that considers coupled thermal, hydraulical, mechanical and chemical effects. The Theory of Porous Media is used as continuum mechanical framework. For kinematic description, large strain continuum mechanics are applied. The paper provides a brief insight into the coupled model, but concentrates on the description of the compaction model and its application within coupled analyses of a laboratory experiment and a landfill structure. Copyright © 2017 John Wiley & Sons, Ltd.

show abstract

“…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%

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

Cox¹

View full text Add to dashboard Cite

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...

show abstract

Modelling the stress–deformation behaviour of municipal solid waste

Cited by 11 publications

References 23 publications

Assessment of the Landfill Barrier System through Numerical Analysis: Rehabilitation and Expansion of Belgrade Landfill Case Study

Assessment of the Landfill Barrier System through Numerical Analysis: Rehabilitation and Expansion of Belgrade Landfill Case Study

Model for degradation-induced settlements as part of a coupled landfill model

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

Contact Info

Product

Resources

About