Porothermoelasticity for swelling shales

The performance assessment of a geological repository for radioactive waste requires quantifying the geochemical evolution of the bentonite engineered barrier. This barrier will be exposed to coupled thermal (T), hydrodynamic (H), mechanical (M) and chemical (C) processes. This paper presents a coupled THC model of the FEBEX (Full-scale Engineered Barrier EXperiment) in situ test which accounts for bentonite swelling and chemical and thermal osmosis. Model results attest the relevance of thermal osmosis and bentonite swelling for the geochemical evolution of the bentonite barrier while chemical osmosis is found to be almost irrelevant. The model has been tested with data collected after the dismantling of heater 1 of the in situ test. The model reproduces reasonably well the measured temperature, relative humidity, water content and inferred geochemical data. However, it fails to mimic the solute concentrations at the heater-bentonite and bentonite-granite interfaces because the model does not account for the volume change of bentonite, the CO 2 (g) degassing and the transport of vapor from the bentonite into the granite. The inferred HCO 3 -and pH data cannot be explained solely by solute Page 2 of 54 transport, calcite dissolution and protonation/deprotonation by surface complexation, suggesting that such data may be affected also by other reactions.

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“…The liquid flux caused by thermal osmosis is added to the Darcian terms (Ghassemi and Diek, 2002;Zhou et al, 1999).…”

Section: Thermal and Chemical Osmosismentioning

confidence: 99%

“…Thermal osmosis has been reported to be relevant for fluid flow in shales (Ghassemi and Diek, 2002) and clay formations (Dirksen, 1969;Srivastava and Avasthi, 1975;Soler, 1999).…”

Section: 32relevance Of Thermal Osmosismentioning

confidence: 99%

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Zheng

Samper

Montenegro

2011

Journal of Contaminant Hydrology

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“…A short list of papers pertinent to the present study includes Biot(1941Biot( , 1956, Gassmann (1951), Biot and Willis (1957), Biot (1962), Deresiewicz and Skalak (1963), Mandl (1964), Nur and Byerlee (1971), Brown and Korringa (1975), Rice and Cleary (1976), Burridge and Keller (1981), Zimmerman et al (1986Zimmerman et al ( ,1994, Berryman and Milton (1991), Thompson and Willis (1991)], Pride et al (1992), Berryman and Wang (1995), Tuncay and Corapcioglu (1995), Alexander and Cheng (1991), Charlez, P. A., and Heugas, O. (1992), Abousleiman et al (1998), Ghassemi and Diek (2002), Tod (2003). Eringen (1970) and Nowacki (1966)developed the linear theory of micropolar thermoelasticity which are known as micropolar coupled thermoelasticity to include thermal effects.…”

Section: Latin American Journal Of Solids and Structures 12 (2015) 14mentioning

confidence: 99%

Two-Dimensional Fractional Order Generalized Thermoelastic Porous Material

Abbas

Youssef

2015

Lat. Am. j. solids struct.

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In the work, a two-dimensional problem of a porous material is considered within the context of the fractional order generalized thermoelasticity theory with one relaxation time. The medium is assumed initially quiescent for a thermoelastic half space whose surface is traction free and has a constant heat flux. The normal mode analysis and eigenvalue approach techniques are used to solve the resulting non-dimensional coupled equations. The effect of the fractional order of the temperature, displacement components, the stress components, changes in volume fraction field and temperature distribution have been depicted graphically.

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“…The net effect is a coupling of thermal and poromechanical processes. A few analytical procedures have been developed and used to solve geomechanics problems of interest involving coupled thermal and poromechanical problems (Delaney 1982;Wang and Papamichos 1994;Li et al 1998;Ghassemi and Diek 2002;Ghassemi and Zhang 2004). However, many problems formulated within the framework of poro-thermoelasticity are not amenable to analytical treatment and need to be solved numerically.…”

Section: Introductionmentioning

confidence: 99%

Fractional thermoelasticity applications for porous asphaltic materials

Ezzat

2016

Pet. Sci.

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A new mathematical model of poro-thermoelasticity has been constructed in the context of a new consideration of heat conduction with fractional order. One-dimensional application for a poroelastic half-space saturated with fluid is considered. The surface of the halfspace is assumed to be traction-free, permeable, and subjected to heating. The Laplace transform technique is used to solve the problem. The inversion of the Laplace transform will be obtained numerically and the numerical values of the temperature, stresses, strains, and displacements will be illustrated graphically for the solid and the liquid.

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Porothermoelasticity for swelling shales

Cited by 80 publications

References 17 publications

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Two-Dimensional Fractional Order Generalized Thermoelastic Porous Material

Fractional thermoelasticity applications for porous asphaltic materials

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