Comparison of soil freezing curve and soil water curve data for Windsor sandy loam

Black, Patrick B.; Tice, Allen R.

doi:10.1029/wr025i010p02205

Cited by 117 publications

(73 citation statements)

References 6 publications

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“…Many researchers have developed freezing characteristic functions through analogies with water retention models developed to describe the drying and wetting of unsaturated unfrozen soils, where gas and liquid phases coexist in the pores (e.g. Koopmans & Miller, 1966;Miller, 1978;Black & Tice, 1989;Grant & Sletten, 2002;Coussy, 2005). The different pressures between the liquid water and ice phases expressed by the Clausius-Clapeyron equation (equation (4)) suggest that surface tension forces should develop along the interface between the two phases, as illustrated in Fig.…”

Section: Freezing Characteristic Functionmentioning

confidence: 99%

THM-coupled finite element analysis of frozen soil: formulation and application

et al. 2009

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A fully coupled thermo-hydro-mechanical (THM) finite element (FE) formulation is presented that considers freezing and thawing in water-saturated soils. The formulation considers each thermal, hydraulic and mechanical process, and their various interactions, through fundamental physical laws and models. By employing a combination of ice pressure, liquid pressure and total stress as state variables, a new mechanical model has been developed that encompasses frozen and unfrozen behaviour within a unified effective-stress-based framework. Important frozen soil features such as temperature and porosity dependence of shear strength are captured inherently by the model. Potential applications to geotechnics include analysis of frost heave, foundation stability or mass movements in cold regions. The model's performance is demonstrated with reference to the in situ pipeline frost heave tests conducted by Slusarchuk et al. Detailed consideration is given to FE mesh design, the influence of hydraulic parameters, and the treatment of air/ground interface boundary conditions. The THM simulation is shown to reproduce, with fair accuracy, the observed pipeline heave and the porosity growth driven by water migration.KEYWORDS: ground freezing; numerical modelling; temperature effects; water flow Dans la présente communication, on présente une formulation aux éléments finis thermo-hydro-mécanique (THM) à accouplement intégral, pour l'examen du gel et du dégel dans des sols saturés d'eau. La formulation examine chaque processus thermique, hydraulique et mécani-que, et leurs différentes interactions, par le biais de lois et modèles physiques fondamentaux. En employant une combinaison de pression de la glace, de pression liquide, et de contrainte totale comme variables d'état, on dével-oppe un nouveau modèle mécanique incorporant un comportement congelé et non congelé, dans un cadre effectif unifié à base de contrainte. Le modèle permet de capturer d'importantes propriétés des terrains congelés, comme la mesure dans laquelle la résistance au cisaillement est tributaire de la température et de la porosité. Parmi les applications potentielles dans la géotechnique, indiquons l'analyse du foisonnement par le gel, la stabilité des fondations, ou les mouvements de masse dans des régions froides. Les performances du modèle sont démon-trées relativement aux tests de foisonnement par le gel in situ sur le pipeline, effectués par Slusarchuk et al. On examine en détail l'étude maillée aux EF, l'influence de paramètres hydrauliques, ainsi que le traitement des conditions limites de l'interface air/sol. On démontre, avec un bon degré de précision, que la simulation THM reproduit le foisonnement relevé sur le pipeline ainsi que l'augmentation de la porosité déterminée par la migration de l'eau.

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Section: Freezing Characteristic Functionmentioning

confidence: 99%

THM-coupled finite element analysis of frozen soil: formulation and application

et al. 2009

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“…If the water in drying soil were mainly retained by capillary forces (equation (5)), equation (16) would have to be modified by multiplying by s/s sl , because of the different free energies of the ice-water and air-water interfaces [Koopmans and Miller, 1966;Black and Tice, 1989]. In the capillary bundle model, only larger capillary tubes contain ice when the temperature is near 0°C.…”

Section: Soil Freezing Characteristic Curvementioning

confidence: 99%

Capillary bundle model of hydraulic conductivity for frozen soil

Watanabe

Flury

2008

Water Resources Research

143

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[1] We developed a capillary bundle model to describe water flow in frozen soil. We assume that the soil can be represented as a bundle of cylindrical capillaries. We consider that the freezing point in the capillaries is depressed according to the Gibbs-Thomson effect and that when stable ice forms in a capillary, the ice forms in the center of the capillaries, leaving a circular annulus open for liquid water flow. We use the model to demonstrate how the hydraulic conductivity changes as a function of temperature for both saturated and unsaturated soils, using a sand and two silt loam soils as examples. As temperature decreases, more and more ice forms, and the water flux consequently decreases. In frozen soil near 0°C, water predominantly flows through ice-free capillaries, so that the hydraulic conductivity of frozen soil is similar to that of an unfrozen soil with a water content equal to the unfrozen water content of the frozen soil. At low temperatures, however, ice forms in almost all capillaries, and the hydraulic conductivity of frozen soil is greater than that of unfrozen soil with the same water potential.Citation: Watanabe, K., and M. Flury (2008), Capillary bundle model of hydraulic conductivity for frozen soil, Water Resour. Res.,

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“…volume of liquid phase/volume of pore) to the porous medium thermodynamic properties [20]. Many researchers have developed freezing characteristic functions through analogies with water retention models developed to describe the drying and wetting of unsaturated unfrozen soils, where gas and liquid phases coexist in the pores [24][25][26][27][28]. The different pressures between the liquid water and ice phases expressed by the Clausius-Clapeyron Eq.…”

Section: Freezing Characteristic Functionmentioning

confidence: 99%

A permafrost test on intact gneiss rock

Duca

Alonso

Scavia

2015

International Journal of Rock Mechanics and Mining Sciences

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Changes in permafrost conditions in high mountain rocks have increased the risk of dangerous instabilities. Ice segregation within the rock mass has been interpreted as one of the mechanisms involved in high mountain bedrock degradation. A long term laboratory test on a cube of intact gneiss has been designed to reproduce field temperature gradients and water supply conditions. Test results demonstrate that ice crystallization in a permafrost fringe (T=0 degrees C to -3 degrees C) leads to the formation of continuous ice-filled cracks which explain the loss of rock continuity and the observed rock failures. A coupled thermo-hydro-mechanical model which incorporates the thermodynamics of ice-water mixtures has been used to reproduce test results. The model, which follows existing formulations for unsaturated porous media, was capable of capturing the main observations derived from the experiment. Calculated tensile stresses are close to the gneiss tensile strength. The analysis performed is a step forward in understanding field observations and in the application of computational tools to real cases. (C) 2015 Elsevier Ltd. All rights reserved.Peer ReviewedPostprint (author's final draft

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Comparison of soil freezing curve and soil water curve data for Windsor sandy loam

Cited by 117 publications

References 6 publications

THM-coupled finite element analysis of frozen soil: formulation and application

THM-coupled finite element analysis of frozen soil: formulation and application

Capillary bundle model of hydraulic conductivity for frozen soil

A permafrost test on intact gneiss rock

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