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An effective thermal conductivity model of geological porous media for coupled thermo-hydro-mechanical systems with multiphase flow
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
2009 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 46, no 8, 1358-1369 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this paper is to present the development of an effective thermal conductivity model for simulation of thermo-hydro-mechanical processes of geological porous media. The Wiener bounds and Hashin-Shtrikman bounds for thermal conductivity of three-phase mixture are introduced first, followed by descriptions of thermal conductivities of gas, water and solid, respectively. The derivation of a new effective thermal conductivity model, in closed form, is then presented. The model considers the combined effects of solid mineral composition, temperature, liquid saturation degree, porosity and pressure on the effective thermal conductivity of porous media, when multiphase flow with phase change is involved. The model strictly obeys the Wiener bounds (for anisotropic media) and Hashin-Shtrikman bounds (for isotropic media) over wide ranges of porosities and saturations, and the predicted results agrees very well with the experimental data for MX80 bentonite, compared with Johansen's method. An experimental benchmark test problem under laboratory conditions for coupled thermo-hydro-mechanical processes of compacted FEBEX bentonite is simulated for validation of the model, and the results show that the model provides improved predictions of the evolution and distribution of temperature, with simpler forms of mathematical functions. (C) 2009 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2009. Vol. 46, no 8, 1358-1369 p.
Keyword [en]
Thermal conductivity, Thermo-hydro-mechanical (THM), Geological porous media, Wiener bounds, Hashin-Shtrikam bounds, Buffer material, Multiphase flow, SOIL, TEMPERATURE, WATER, AIR, NITROGEN, BUFFER, OXYGEN, RANGE, ARGON
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-12028DOI: 10.1016/j.ijrmms.2009.04.010ISI: 000272940400011Scopus ID: 2-s2.0-70449527769OAI: oai:DiVA.org:kth-12028DiVA: diva2:297982
Note
QC20100720Available from: 2010-02-19 Created: 2010-02-19 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Numerical modeling of coupled thermo-hydro-mechanical processes in geological porous media
Open this publication in new window or tab >>Numerical modeling of coupled thermo-hydro-mechanical processes in geological porous media
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Coupled Thermo-Hydro-Mechanical (THM) behavior in geological porous media has been a subject of great interest in many geoengineering disciplines. Many attempts have been made to develop numerical prediction capabilities associated with topics such as the movement of pollutant plumes, gas injection, energy storage, geothermal energy extraction, and safety assessment of repositories for radioactive waste and spent nuclear fuel. This thesis presents a new numerical modeling approach and a new computer code for simulating coupled THM behavior in geological porous media in general, and compacted bentonite clays in particular, as buffer materials in underground radioactive waste repositories.

New governing equations were derived according to the theory of mixtures, considering interactions among solid-phase deformation, flows of water and gases, heat transport, and phase change of water. For three-dimensional problems, eight governing equations were formulated to describe the coupled THM processes.

A new thermal conductivity model was developed to predict the thermal conductivity of geological porous media as composite mixtures. The proposed model considers the combined effects of solid mineral composition, temperature, liquid saturation degree, porosity and pressure on the effective thermal conductivity of the porous media. The predicted results agree well with the experimental data for MX80 bentonite.

A new water retention curve model was developed to predict the suction-saturation behavior of the geological porous media, as a function of suction, effective saturated degree, temperature, porosity, pore-gas pressure, and the rate of saturation degree change with time. The model was verified against experimental data of the FEBEX bentonite, with good agreement between measured and calculated results.

A new finite element code (ROLG) was developed for modeling fully coupled thermo-hydro-mechanical processes in geological porous media. The new code was validated against several analytical solutions and experiments, and was applied to simulate the large scale in-situ Canister Retrieval Test (CRT) at Äspö Hard Rock Laboratory, SKB, Sweden, with good agreement between measured and predicted results. The results are useful for performance and safety assessments of radioactive waste repositories.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. xiv, 84 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1055
Keyword
Thermo-hydro-mechanical processes; Porous geologicalmedia; Numerical modeling; FEM; Multiphase flow; Effective thermal conductivity; Water retention curve; Radioactive waste repositories;Bentonite;
National Category
Geophysical Engineering
Identifiers
urn:nbn:se:kth:diva-12009 (URN)978-91-7415-554-9 (ISBN)
Public defence
2010-03-12, F3, Lindstedtsvägen 26, KTH, Stockholm, 16:15 (English)
Opponent
Supervisors
Projects
THERESA
Note
QC20100720Available from: 2010-02-26 Created: 2010-02-15 Last updated: 2010-07-20Bibliographically approved

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