Impact of Soil Type and Compaction Conditions on Soil Water Characteristic

Miller, Carol J.; Yeşiller, Nazlı; Yaldo, K; Merayyan, S.

doi:10.1061/(asce)1090-0241(2002)128:9(733)

Cited by 139 publications

(77 citation statements)

References 9 publications

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“…Freezing or thawing energy is the area bound by the temperature-time curve and the 0°C baseline (area below 0°C for freezing, area above 0°C for thawing). (2003), thermal properties were modeled as linearly dependent on saturation (completely dry to fully saturated), d based on manufacturer's data, e estimated from transmissivity using manufacturer's data, f based on data presented in Erickson and Thiel (2002), g result of long-term equilibrium with underlying clay from numerical simulation, h The hydraulic properties for the clay were estimated using data from Miller et al (2002) for similar material.…”

Section: Numerical Modelmentioning

confidence: 99%

Thermal Analysis of GCLs at a Municipal Solid Waste Landfill

Hanson

Yeşiller

Swarbrick

2005

Waste Containment and Remediation

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This study was conducted to determine long-term thermal regime of landfill liner systems using a field temperature monitoring program and numerical analysis of heat transfer. Temperatures in liner systems that contain geosynthetic clay liners (GCLs) were monitored prior and subsequent to waste placement. Data were collected in three cells at a landfill in Midwestern USA for more than five years. The liner system in one of the cells was left exposed (not covered with waste) for a period exceeding one year subsequent to cell construction. The lowest and highest GCL temperatures were -1°C and 35°C, respectively and the localized temperature gradients ranged from approximately -186°C/m to +134°C/m across the liner system during the exposed period. Seasonal temperature fluctuations were dampened and increasing temperature trends were observed after placement of the first lift of waste over the liner systems. Temperatures in liners reached 30°C under 5-year-old waste with an annual rate of temperature increase of approximately 4°C/a. In general, average temperature gradients decreased, however, high variations in gradients remained subsequent to waste placement. Numerical analysis was used for exposed liner systems to model observed behavior and to predict liner response under varied conditions. Good agreement was observed between measured and predicted temperatures. Temperature distributions in liners were determined for variable thicknesses of sand protective layers in 3 climatic regions. Sand thicknesses of more than 1 m were required to maintain temperatures between 0 and 40°C and thicknesses on the order of 3 m were required to limit seasonal temperature variations to within 10°C in GCLs. IntroductionGCLs are used commonly in containment systems for bottom liner systems as well as for cover liner systems. GCLs are subjected to coupled effects of environmental and operational stresses in the field including mechanical, hydraulic, chemical, and thermal stresses. Temperature affects properties and behavior of GCLs (Rowe 1998). In general, detailed spatial or temporal distributions or comprehensive long-term trends for GCL field temperatures are not available. Also, heat transfer in liner systems has not been analyzed extensively in the past. This study was conducted to determine long-term temperature trends in GCL liners in the field. Onset and duration of temperature variations with respect to local air and ground temperatures have been studied. Thermal gradients in a liner system were determined. Heat transfer through GCL liner systems was investigated using numerical analysis.

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Section: Numerical Modelmentioning

confidence: 99%

Thermal Analysis of GCLs at a Municipal Solid Waste Landfill

Hanson

Yeşiller

Swarbrick

2005

Waste Containment and Remediation

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“…The volume of voids in a soil depends on the granulometry and on the state of compaction of the medium. In deformable soils, it has been evidenced that the soil deformation has an effect on the shape of the soil-water retention curve (SWRC) (Romero and Vaunat 2000;Miller et al 2002;Sugii et al 2002;Tarantino and Tombolato 2005;Salager et al 2007;Miller et al 2008;Parent et al 2011). Conventionally, the main source of deformation is the external, mechanical stress exerted on the soil.…”

Section: Introductionmentioning

confidence: 99%

Investigation into water retention behaviour of deformable soils

et al. 2013

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Abstract:The paper presents an experimental and modelling approach for the soil-water retention behaviour of two deformable soils. The objective is to investigate the physical mechanisms that govern the soil-water retention properties and to propose a constitutive framework for the soil-water retention curve accounting for the initial state of compaction and deformability of soils. A granular soil and a clayey soil were subjected to drying over a wide range of suctions so that the residual state of saturation could be attained. Different initial densities were tested for each material. The soil-water retention curves (SWRCs) obtained are synthesized and compared in terms of water content, void ratio, and degree of saturation, and are expressed as a function of the total suction. The studies enable assessment of the effect of the past and present soil deformation on the shape of the curves. The void ratio exerts a clear influence on the air-entry value, revealing that the breakthrough of air into the pores of the soil is more arduous in denser states. In the plane of water content versus suction, the experimental results highlight the fact that from a certain value of suction, the retention curves corresponding to different densities of the same soil are convergent. The observed features of behaviour are conceptualized into a modelling framework expressing the evolution of the degree of saturation as a function of suction. The proposed retention model makes use of the theory of elastoplasticity and can thus be generalized into a hysteretic model applicable to drying-wetting cycles. The calibration of the model requires the experimental retention data for two initial void ratios. The prediction of tests for further ranges of void ratios proves to be accurate, which supports the adequacy of formulated concepts.Key words: soil-water retention curve, unsaturated soils, deformable media, constitutive modelling. Mots-clés : courbe de rétention d'eau du sol, sols non saturés, médium déformable, modèle constitutif.

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“…It is obvious, however, that the water retention curve depends on the soil density (Miller et al 2002;Sugii et al 2002;Tarantino and Tombolato 2005) and that soil deformation is responsible for suction variations. Therefore, for the construction of a retention constitutive law, it is essential to consider the evolution of the density state in the course of drying or wetting processes (Delage et al 1998;Romero 1999;Fleureau et al 2002;Olchitsky 2002).…”

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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Impact of Soil Type and Compaction Conditions on Soil Water Characteristic

Cited by 139 publications

References 9 publications

Thermal Analysis of GCLs at a Municipal Solid Waste Landfill

Thermal Analysis of GCLs at a Municipal Solid Waste Landfill

Investigation into water retention behaviour of deformable soils

Definition and experimental determination of a soil-water retention surface

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