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Chemically- and mechanically-mediated influences on the transport and mechanical characteristics of rock fractures

Cited 42 time in Web of Science Cited 67 time in Scopus
Authors
Min, Ki-Bok; Rutqvist, Jonny; Elsworth, Derek
Issue Date
2009
Publisher
Elsevier
Citation
Int J Rock Mech Min Sci 2009;46;80-9
Keywords
Chemo-mechanical couplingFracture apertureFracture constitutive modelRock fracture
Abstract
A model is presented to represent changes in the mechanical and transport characteristics of fractured
rock that result from coupled mechanical and chemical effects. The specific influence is the elevation of
dissolution rates on contacting asperities, which results in a stress- and temperature-dependent
permanent closure. A model representing this pressure-dissolution-like behavior is adapted to define
the threshold and resulting response in terms of fundamental thermodynamic properties of a
contacting fracture. These relations are incorporated in a stress-stiffening model of fracture closure to
define the stress- and temperature-dependency of aperture loss and behavior during stress and
temperature cycling. These models compare well with laboratory and field experiments, representing
both decoupled isobaric and isothermal responses. The model was applied to explore the impact of
these responses on heated structures in rock. The result showed a reduction in ultimate induced
stresses over the case where chemical effects were not incorporated, with permanent reduction in final
stresses after cooling to ambient conditions. Similarly, permeabilities may be lower than they were in
the case where chemical effects were not considered, with a net reduction apparent even after cooling
to ambient temperature. These heretofore-neglected effects may have a correspondingly significant
impact on the performance of heated structures in rock, such as repositories for the containment of
radioactive wastes.
ISSN
1365-1609
Language
English
URI
https://hdl.handle.net/10371/11961
DOI
https://doi.org/10.1016/j.ijrmms.2008.04.002
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Journal Papers (저널논문_에너지시스템공학부)
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