Thermomechanical effects on adsorbed water in clays around a heat source

Ma, Chenmin; Hueckel, Tomasz

doi:10.1002/nag.1610170304

Cited by 31 publications

(8 citation statements)

References 19 publications

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“…Denoting K " R\ the mesoscopic permeability tensor of the clay particles (recall that R is positive de"nite), using (19) and (49) in (5) and neglecting inertial e!ects we obtain the mesoscopic Darcy's law for the adsorbed water v…”

Section: Near-equilibrium Resultsmentioning

confidence: 99%

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Thermomechanical model of hydration swelling in smectitic clays: I two-scale mixture-theory approach

Murad

1999

Int. J. Numer. Anal. Meth. Geomech.

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A thermomechanical theory of hydration swelling in smectitic clays is proposed. The clay is treated as a three-scale swelling system wherein macroscopic governing equations are derived by upscaling the microstructure. At the microscale the model has two phases, the disjoint clay platelets and adsorbed water (water between the platelets). At the intermediate (meso) scale (the homogenized microscale) the model consists of clay particles (adsorbed water plus clay platelets) and bulk water. At the macroscale the medium is treated as an homogenized swelling mixture of clay particles and bulk-phase water with thermodynamic properties de"ned everywhere within the macroscopic body. In Part I, the mesoscopic model governing the swelling of the clay particles is derived using a mixture-theoretic approach and the Coleman and Noll method of exploitation of the entropy inequality. Application of this procedure leads to two-scale governing equations which generalize the classical thermoelastic consolidation model of non-swelling media, as they exhibit additional physico-chemical and viscous-type terms accounting for hydration stresses between the adsorbed #uid and the clay minerals. In Part II the two-scale model is applied to a bentonitic clay used for engineered barrier of nuclear waste repository. The clay bu!er is assumed to have monomodal character with most of the water essentially adsorbed. Further, partial results toward a three-scale thermomechanical macroscopic model including the bulk phase next to the swelling particles are derived by homogenizing the two-scale model with the bulk water. A notable consequence of this three-scale approach is that it provides a rational basis for the appearance of a generalized inter-phase mass transfer between adsorbed and bulk water.

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Section: Near-equilibrium Resultsmentioning

confidence: 99%

“…Reference 39). Equation (19) states that the averaged (mesoscopic) adsorbed water stress tensor is a multiple of the identity. The physical meaning of the constitutive equation (20) for t will be discussed next.…”

Section: ¹ "mentioning

confidence: 99%

Thermomechanical model of hydration swelling in smectitic clays: I two-scale mixture-theory approach

Murad

1999

Int. J. Numer. Anal. Meth. Geomech.

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“…Combining Equations reveal that the diffusion flux is reinforced as the soil temperature rises. In fact, high temperature (corresponding to the low temperature difference in this test) can degrade the soil water retention ability, as it influences various soil properties such as the density, viscosity, surface tension and dielectric constant (Arifin, 2008; Cui et al., 2000; Delage et al., 2000; Ma & Hueckel, 1993; Mitchell, 1993). Hence, under evaporation conditions, due to the existing suction gradient, the soil body in the high temperature area is weak in restraining the migration of pore water into low temperature regions.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Investigating Soil Desiccation Cracking Using an Infrared Thermal Imaging Technique

Zhou

Tang

Zhu

et al. 2021

Water Resources Research

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“…The risk of fracture is controlled both by the above-mentioned properties, and by the boundary conditions of the problem. Booker & Savvidou (1985) and Ma & Hueckel (1993) have analysed these phenomena from a basic perspective. Booker & Savvidou (1985) provided analytical solutions for the fundamental problem of a point heat source in a saturated soil.…”

Section: Introductionmentioning

confidence: 99%

“…Booker & Savvidou (1985) provided analytical solutions for the fundamental problem of a point heat source in a saturated soil. A mixture theory of two interacting thermoelastic constituents was proposed by Ma & Hueckel (1993), who introduced a mass transfer between adsorbed water and bulk water due to the increase in temperature. This effect may explain the increase in permeability associated with temperature increase (Pusch, 1987).…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydraulic characterisation of soft rock by means of heating pulse tests

2009

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Geotechnical Research Medal, Institution of Civil Engineering (London)Low-permeability clayey rocks, currently considered as suitable host rocks for high-level nuclear waste disposal, pose a challenge for the determination of thermal, hydraulic and mechanical properties. A thermo-hydraulic stainless steel cell, capable of testing undisturbed soil or rock cores 70 mm in diameter and 100 mm long, has been developed and used to identify thermal properties (conduction coefficient, heat capacity, thermal expansion), permeability (derived from gas and water tests) and swelling behaviour. The cell is operated in a constant-temperature bath. Miniature pore water pressure transducers and thermocouples are installed in different positions of the specimen. Strain gauges attached to a reduced-thickness ring section of the cell provide information for swelling pressure determinations. Temperature changes are applied by a thin heater centred in the axis of the specimen. A computer code was specifically written to perform and control experiments. Air permeability is determined by means of a pulse decay technique, whereas liquid permeability is directly interpreted at steady-state conditions. However, back-analysis of the complete measured response of the specimen (pore pressures, temperatures and swelling pressures) provides the best procedure for identifying properties. A testing protocol involving a sequence of undrained and drained heating tests has been developed to determine, in an ordered way, the thermal properties and the permeability. The procedure requires the concourse of a coupled thermo-hydro-mechanical code in order to simulate test results. The program CODE_BRIGHT, developed at UPC, was used for these purposes. The procedure was applied to the identification of the thermal properties of Opalinus clay shale.Peer ReviewedAward-winningPostprint (published version

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Thermomechanical effects on adsorbed water in clays around a heat source

Cited by 31 publications

References 19 publications

Thermomechanical model of hydration swelling in smectitic clays: I two-scale mixture-theory approach

Thermomechanical model of hydration swelling in smectitic clays: I two-scale mixture-theory approach

Investigating Soil Desiccation Cracking Using an Infrared Thermal Imaging Technique

Thermo-hydraulic characterisation of soft rock by means of heating pulse tests

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