Landfill lining stability and integrity: the role of waste settlement

Jones, D. R. V.; Dixon, Neil

doi:10.1016/j.geotexmem.2004.08.001

Cited by 111 publications

(47 citation statements)

References 6 publications

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“…The implications of using this simplified slope geometry are discussed in Section 6. A landfill base length of 100 m was used in all analyses, as it has been shown to be sufficient to avoid the generation of interface slippage along the base (Jones and Dixon 2005). Further information on the modelling methodology is provided by Sia (2007).…”

Section: Landfill Numerical Modelmentioning

confidence: 99%

“…Waste unit weight (ª waste ) was taken as a random variable in the Monte Carlo simulation, since it is known that it can have a significant influence on the interaction between the lining system and the waste (e.g. Jones and Dixon 2005). The ª waste values are related to moderately compacted MSW, with a value for each simulation sampled from a normal probability distribution with a mean of 10 kN/m 3 and coefficient of variation (COV) of 19.4% (Table 1).…”

Section: Subgrade and Waste Materials Input Parametersmentioning

confidence: 99%

“…Various researchers (Long et al 1995;Reddy et al 1996;Filz et al 2001;Jones and Dixon 2005;Fowmes et al , 2008 have demonstrated through numerical analyses the complex behaviour of lining-waste interaction and the mechanism of stress transfer in a landfilllining system. The most advanced analyses (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Numerical modelling of landfill lining system–waste interaction: implications of parameter variability

Sia

Dixon

2012

Geosynthetics International

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Numerical modelling techniques can be used to examine the serviceability limit states of landfill side-slope lining systems in response to waste placement. A study has been conducted in which the variability of significant model input parameters have been investigated within a probabilistic framework using Monte Carlo simulation. Key model parameters are treated as random variables, and the statistical information required to describe their distributions has been derived from a laboratory repeatability testing programme, a literature survey and an expert consultation process. Model outputs include relative shear displacements between lining components, and tensile strains in the geosynthetic layers that occur in response to staged placement of waste against the side slope. It was found that analyses including input parameter variability were able to identify mechanisms influencing liner performance and their probability of occurrence. These mechanisms include large (i.e. )100 mm) relative displacements at interfaces that can generate post-peak strengths, and mobilised tensile strains in the geomembrane and geotextile layers. Additionally, it was found that relative displacements at the controlling (i.e. weakest) liner interface are greater for landfills with a steep side slope, for stiffer waste and thicker waste lifts, while tensile strains in the geosynthetic elements are greater for steep side slopes, more compressible waste and thinner waste lifts. Outputs from probabilistic analyses such as that used in this study can guide engineers regarding geometries and materials that could produce waste-settlement-generated serviceability limit state failures, and hence can be used to support more reliable designs.

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Section: Landfill Numerical Modelmentioning

confidence: 99%

Section: Subgrade and Waste Materials Input Parametersmentioning

confidence: 99%

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Numerical modelling of landfill lining system–waste interaction: implications of parameter variability

Sia

Dixon

2012

Geosynthetics International

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“…Displacements in liner systems Shear displacements occur within landfill liner systems due to a variety of mechanisms, including construction activities (McKelvey 1994), thermal expansion/contraction, mobilization of passive resistance of a waste buttresses on a base liner (Stark and Poeppel 1994), strain incompatibility between waste materials and geosynthetic interfaces (Reddy et al 1996;Eid et al 2000), earthquakes (Kavazanjian et al 2011), waste placement procedures (Yazdani et al 1995;, and waste settlement (Long et al 1995). For example, displacements along a bottom liner system are generally assumed to be nonuniform and progressive (Byrne 1994;Stark and Poeppel 1994;Gilbert and Byrne 1996;Reddy et al 1996;Gilbert et al 1996b;Filz et al 2001;Jones and Dixon 2005;Dixon et al 2012;Sia and Dixon 2012). Shear failure will occur at the interface with the lowest peak strength, which may or may not correspond to the interface with the lowest residual strength.…”

Section: Selection Of Strength Envelopes For Designmentioning

confidence: 99%

State-of-the-art report: GCL shear strength and its measurement – ten-year update

Fox

Stark

2015

Geosynthetics International

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This paper presents an invited update to our 2004 state-of-the-art report and provides a comprehensive source of information on the shear strength and shear strength testing of geosynthetic clay liners (GCLs). Essential concepts of shear stress-displacement behavior and shear strength are presented, followed by detailed discussions on the laboratory measurement of the shear strength of GCLs and GCL interfaces. The paper also provides recommendations for the selection of design strength envelopes for stability analyses and checklists to assist users in the specification of GCL shear testing programs. North American practice is emphasized and discussions are focused primarily within the context of landfill bottom liner and cover systems. Conclusions and recommendations are provided with regard to GCL shear strength behavior and current GCL strength testing practice, improvements for GCL strength testing are suggested, and future research needs are identified.

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“…For example, primary and secondary compression indices have been used as MSW compressibility parameters to predict landfill settlement (Edil et al, 1990;Landva et al, 2000). Moreover, soil constitutive models have been widely adopted for MSW in landfill-related numerical modelling (Bryne, 1994;Filz et al, 2001;Fowmes et al, 2005;Jones and Dixon, 2005;Long et al, 1995;Meißner and Abel, 2000;Reddy et al, 1996). However, with increasing demands to simulate the mechanical response of MSW (particularly in numerical modelling), an advanced understanding of how such waste reacts to external forces is needed.…”

Section: Introductionmentioning

confidence: 99%

Development and evaluation of a phase relationship for MSW

Zhang¹,

Dixon²,

El-Hamalawi³

2010

Proceedings of the Institution of Civil Engineers - Waste and R

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Compression is one of the most important mechanical aspects of behaviour of municipal solid waste (MSW) which concerns stability, deformation and structural performance in a landfill. Previous studies have shown that compressible particles play a significant role in MSW compression. Definition of the void ratio in classical soil mechanics theory may no longer be applicable for MSW material since high non-linearity between void ratio changes and vertical stress changes have been identified in compression tests. A new phase relationship for MSW has been developed to include the volume loss of compressible particles and this has been evaluated using one-dimensional compression test data. The comparison between analytical and test results has demonstrated that the MSW phase relationship is capable of analysing the volume losses originated from inter- and intra-void ratio changes, in addition to the total volume loss of the MSW sample under different vertical stresses. Since it can isolate the volumetric change of compressible particles from the total volume loss, the MSW phase relationship is important when developing a constitutive model for MSW assuming elasto-plastic material behaviour, which couples the volumetric and shear behaviour.

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Landfill lining stability and integrity: the role of waste settlement

Cited by 111 publications

References 6 publications

Numerical modelling of landfill lining system–waste interaction: implications of parameter variability

Numerical modelling of landfill lining system–waste interaction: implications of parameter variability

State-of-the-art report: GCL shear strength and its measurement – ten-year update

Development and evaluation of a phase relationship for MSW

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