Evaluation of a thermal criterion for an engineered barrier system

Imbert, Christophe; Olchitzky, Estelle; Lassabatère, Thierry; Dangla, Patrick; Courtois, Alexis

doi:10.1016/j.enggeo.2005.06.019

Cited by 32 publications

(16 citation statements)

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“…This fundamental curve links the variations of the potential energy of the liquid phase, usually characterized by the suction, s, to the variations of the saturation state, characterized by the water content, w, or the degree of saturation, S r . The retention curve has been widely studied during the past several decades with a focus on the (i) fitting equation (Brooks and Corey 1964;Fredlund and Xing 1994), (ii) influence of soil compaction conditions (Vanapalli et al 1999;Sugii et al 2002;Verbrugge and Fleureau 2002), (iii) modelling of hysteresis (Li 2005;Pham et al 2005;Nuth and Laloui 2008), and (iv) influence of temperature (Romero et al 2001;Imbert et al 2005;Tang 2005;Salager et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Definition and experimental determination of a soil-water retention surface

2010

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Definition and experimental determination of a soil-water retention surface S. Salager, M.S. El Youssoufi, and C. SaixAbstract: This paper deals with the definition and determination methods of the soil-water retention surface (SWRS), which is the tool used to present the hydromechanical behaviour of soils to highlight both the effect of suction on the change in water and total volumes and the effect of deformation with respect to the water retention capability. An experimental method is introduced to determine the SWRS and applied to a clayey silty sand. The determination of this surface is based on the measurement of void ratio, suction, and water content along the main drying paths. These paths are established for five different initial states. The experimental results allow us to define the parametric equations of the main drying paths, expressing both water content and void ratio as functions of suction and initial void ratio. A model of the SWRS for clayey silty sand is established in the space (void ratio -suction -water content). This surface covers all possible states of the soil inside the investigated range for the three variables. Finally, the SWRS is used to study the relations between water content and suction at a constant void ratio and between void ratio and suction at a constant water content.Key words: water retention, hydromechanical coupling, retention behaviour.Résumé : Cet article traite de la définition et des méthodes de détermination de la surface de rétention sol-eau (« SWRS ») comme outil de représentation du comportement hydromécanique de sols permettant de mettre en évidence à la fois l'effet de la succion sur les changements de volumes (volume d'eau et volume total) et l'effet de la déformation sur la capacité de rétention d'eau des sols. Une méthode expérimentale de détermination de la SWRS du sol est présentée en détails puis appliquée pour un sable limoneux argileux. La prise en compte de la déformation conduit à une représentation surfacique à partir de la mesure de triplets (indice des vides -succion -teneur en eau) le long des chemins de séchage principaux. Ces chemins sont établis pour cinq états initiaux différents. Les résultats expérimentaux permettent d'établir les équations paramétriques des chemins de séchage principaux exprimant l'indice des vides et la teneur en eau en fonction de la succion et de l'indice des vides initial. Un modèle de surface caractéristique sol-eau est élaboré pour le sable limoneux argileux dans l'espace (indice des vides -succion -teneur en eau). Cette surface couvre tous les états possibles du sol dan les gammes étudiées des trois variables. La SWRS est finalement utilisée pour Õ tudier les relations entre la teneur en eau et la succion pour un indice des vides constant, et entre l'indice des vides et la succion pour une teneur en eau constante.

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Section: Introductionmentioning

confidence: 99%

Definition and experimental determination of a soil-water retention surface

2010

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“…This is important to consider as changes in the SWRC may affect the mechanical behaviour of unsaturated soils (Romero et al, 2001;Uchaipichat & Khalili, 2009). A shift in the SWRC to lower degrees of saturation for elevated temperatures was also reported in studies by geotechnical engineers that involved control of the stress state and measurement of volume change, including Romero et al (2001), Salager et al (2007) and Uchaipichat & Khalili (2009) for low suction values, and Olchitzky (2002), Romero et al (2003), Imbert et al (2005), Tang & Cui (2005) and Villar & Gomez (2007) for high suction values. They attributed this shift to changes in the soil-water contact angle, a reduction in the interfacial tension between air and water, and thermal expansion of air entrapped within the soil pores.…”

Section: Influence Of Temperature On Swrcmentioning

confidence: 73%

Thermal behaviour of unsaturated silt at high suction magnitudes

Alsherif

McCartney

2015

Géotechnique

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A triaxial cell was developed to investigate the shear strength of unsaturated silt under elevated temperatures and high suction magnitudes. The results from a series of drained triaxial compression tests on compacted silt specimens are presented in this paper. After anisotropic compression, some specimens were heated before suction was applied, while others were heated after the application of suction. The shear stress-strain curves of the soils under high suction magnitudes showed a brittle failure mechanism, with a clear increase in peak shear strength with net confining stress. Heating after suction application led to a greater peak shear strength than reference tests at ambient temperature, whereas heating before suction application led to a lower peak shear strength. Despite the observed path effects, a single peak failure envelope was defined when evaluating the data in terms of effective stress. The suction stress concept was used to define the effective stress, and the values of suction stress were found to be linked with a non-isothermal definition of the soil-water retention curve.

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“…• Small perturbation theory (small transient), as adopted in (Imbert et al, 2005;Olchitzky, 2000), resulting in the linearisation of the hydric behaviour, so of the relation Sr(p).…”

Section: Water Permeability Assessmentmentioning

confidence: 99%

Concrete desorption isotherms and permeability determination: effects of the sample geometry

Sémété¹,

Février²,

Pape

et al. 2015

European Journal of Environmental and Civil Engineering

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The isotherm sorption curve is a first-order parameter used in the Finite Element modelling of concrete moisture transport, shrinkage and creep behaviour. An original experimental campaign was developed by EDF R&D in order to characterise the first desorption isotherm at room temperature of a laboratory concrete. Long-term drying tests were carried out on three sample geometries: radial and axial one-dimensional drying on thin discs and multi-dimensional drying on representative elementary volumes (REV), in order to evaluate the possibility of accelerating the tests. Porosity, densities and mass loss curves are measured and the first-desorption isotherms obtained for the three different configurations are compared. Several analyses of these results are proposed including the assessment of a criterion for the determination of the moisture content final balance (estimation of the asymptotic mass loss) and the back analysis of equivalent permeability. The tests results show the significant time gain using thin (2.5 mm) concrete half samples drying in radial direction compared to the REV samples.

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Evaluation of a thermal criterion for an engineered barrier system

Cited by 32 publications

References 1 publication

Definition and experimental determination of a soil-water retention surface

Definition and experimental determination of a soil-water retention surface

Thermal behaviour of unsaturated silt at high suction magnitudes

Concrete desorption isotherms and permeability determination: effects of the sample geometry

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