Gravel contacts and geomembrane strains for a GM/CCL composite liner

Brachman, R. W. I.; Gudina, S. V.

doi:10.1016/j.geotexmem.2008.06.001

Cited by 70 publications

(20 citation statements)

References 20 publications

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“…The variations in strains at different indentations where cracks formed for the same GLLS experiment is to be expected given the variation in the size and shape of the gravel contacts. This variability was also observed and quantified by Brachman and Gudina (2008a) based on many replicate GLLS experiments at room temperature using the same gravel.…”

Section: Effect Of Temperature On Gmb Crackingmentioning

confidence: 68%

“…Cracks were observed at strains as low as 6%, highlighting the need to prevent indentations that cause tensile strains of this magnitude by ensuring an appropriate protection layer between the drainage gravel and GMB. Various types of protection layer have been used to limit local tensile strains in GMBs used in landfills including: thick soil layers Müller 1996, 2003;Gudina and Brachman 2006;Dickinson and Brachman 2008;Rowe et al 2013); very thick nonwoven needle-punched geotextiles (Seeger and Müller 1996;Zanzinger 1999;Gudina and Brachman 2006;Brachman and Gudina 2008a;Koerner et al 2010); multi-layered geotextiles composites (Brachman and Sabir 2013); various sand-filled geocomposites (Saathoff and Sehrbrock 1994;Zanzinger 1999;Tognon et al 2000;Dickinson and Brachman 2008); rubber geocomposites (Zanzinger 1999;Tognon et al 2000); and recycled rubber tire shreds (Reddy and Saichek 1998;Dickinson and Brachman 2008). At present, only thick soil layers have been shown to limit the long-term tensile strain to very small levels (, 2%) for 50 mm coarse gravel above a 1.5 mm thick HDPE geomembrane and at a pressures up to 1000 kPa (Tognon et al 2000;Gudina and Brachman 2006;Gudina 2008a, 2008b;Dickinson and Brachman 2008).…”

Section: Effect Of Temperature On Gmb Crackingmentioning

confidence: 99%

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Brittle rupture of an aged HPDE geomembrane at local gravel indentations under simulated field conditions

Abdelaal

Rowe

Brachman

2014

Geosynthetics International

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The susceptibility of a 1.5 mm thick high-density polyethylene geomembrane to brittle rupture from long-term stress cracking in a simulated municipal solid waste landfill liner is examined. The geomembrane was pre-aged in a leachate at 858C to lower the notched constant tensile load stress crack resistance of the geomembrane to about 75 h. The aged geomembrane was then used as part of a composite liner system in geosynthetic liner longevity simulators (GLLSs) with a geosynthetic clay liner and sand foundation layer below the geomembrane and a 560 g/m 2 geotextile protection layer and 50 mm drainage gravel above the geomembrane. The GLLSs allow the simulation of field conditions including elevated temperatures, overburden pressure, leachate circulation, and composite liner exposure conditions. The geomembrane experienced brittle rupture on the side slopes of the local gravel indentations for temperatures between 55 and 858C. The higher the liner temperature, the shorter the time to rupture and the higher the tensile strain at rupture. Arrhenius modelling of the test data gave an activation energy of E a ¼ 112 kJ/mol.

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Section: Effect Of Temperature On Gmb Crackingmentioning

confidence: 68%

Section: Effect Of Temperature On Gmb Crackingmentioning

confidence: 99%

Brittle rupture of an aged HPDE geomembrane at local gravel indentations under simulated field conditions

Abdelaal

Rowe

Brachman

2014

Geosynthetics International

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“…Atteia and Hohener [32] presented a semi-analytical model for simulating VOCs transfer in the unsaturated soils based on the van Genuchten functions.There are two contaminant transport mechanisms relevant to typical landfill applications: advection and diffusion. A buildup of gas pressure in the landfill provides the driving force for advective flow through tears or holes in the GM [33] or composite barrier [14,[34][35][36]. However, even if there are no holes, vapor-phase VOCs can migrate through the nonporous membrane by molecular diffusion [18,19].…”

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confidence: 99%

An analytical model for vapor‐phase volatile organic compound diffusion through landfill composite covers

Xie

Yan

Thomas

et al. 2016

Num Anal Meth Geomechanics

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Summary One‐dimensional mathematical models for vapor‐phase volatile organic compound (VOC) diffusion through composite cover barriers are presented. An analytical solution to the model was obtained by the method of separation of variables. The results obtained by the proposed solution agree well with those obtained by a numerical analysis. Based on the proposed analytical model, the VOC breakthrough curves of five different composite covers are compared. The effects of degree of saturation of geosynthetic clay liner (GCL) or compacted clay liner (CCL) on VOC migration in the composite covers are then presented. Results show that the composite cover barriers provide much better diffusion barriers for VOC than the single CCL. The top surface steady‐state flux for a composite barrier, consisting of a 1.5 mm geomembrane (GM) and a 20 cm CCL, can be 8.3 times lower than that for a 30 cm CCL. The surface steady‐state flux for the case with (1.5 mm GM + 6 mm GCL) was found to be 2.3 times lower than that for the case with (1.5 mm GM + 20 cm CCL). The degree of saturation Sr of the CCL has a great influence on VOC migration in composite covers when Sr is larger than 0.5. The steady‐state flux at the surface of GM for the case with Sr = 0.7 can be 1.8 times lower than that for the case with Sr = 0.2. The proposed analytical model is relatively simple and can be used for verification of complicated numerical models, analysis of experimental data and performance assessment of composite cover barriers. Copyright © 2016 John Wiley & Sons, Ltd.

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“…A razão de área do dano é definida como área total de contato do rejeito impresso no papel alumínio dividido pela área total da amostra do papel alumínio. De acordo Brachman and Gudina (2008) este valor fornece uma medida da pressão atuando sobre a geomembrana. Na Figura 4.26 apresenta-se a razão de área de cada uma das geomembranas testadas versus a pressão à que estão submetidas.…”

Section: 17-comparação Entre As Razões De áReas De Todos Os Ensaiounclassified

“…. SegundoBrachman & Gudina (2008), a escassez de dados sobre a natureza, tamanho, espaçamento e magnitude de contatos de pedregulho que atuam sobre a geomembrana (ou a camada de proteção) é um obstáculo para a quantificação das tensões de longo prazo na geomembrana Brachman & Gudina (2008). desenvolveram um método para registrar as formas, tamanhos e espaçamento dos contatos do pedregulho de uma camada de drenagem granular sobrejacente à geomembrana, num equipamento de 590 mm de diâmetro e 500 mm de altura.…”

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Análise de danos em geomembranas por meio de ensaios de laboratório em diferentes escalas

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Gravel contacts and geomembrane strains for a GM/CCL composite liner

Cited by 70 publications

References 20 publications

Brittle rupture of an aged HPDE geomembrane at local gravel indentations under simulated field conditions

Brittle rupture of an aged HPDE geomembrane at local gravel indentations under simulated field conditions

An analytical model for vapor‐phase volatile organic compound diffusion through landfill composite covers

Análise de danos em geomembranas por meio de ensaios de laboratório em diferentes escalas

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