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A microcracks-induced damage model for initially anisotropic rocks accounting for microcracks closure

Levasseur, Séverine and Welemane, Hélène and Kondo, Djimédo A microcracks-induced damage model for initially anisotropic rocks accounting for microcracks closure. (2015) International Journal of Rock Mechanics and Mining Sciences, 77. 122-132. ISSN 1365-1609

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Official URL: http://dx.doi.org/10.1016/j.ijrmms.2015.03.011

Abstract

We formulate a new micromechanical damage model for anisotropic rocks. This model accounts not only for the coupling between material initial anisotropy and the damage-induced one, but also for the opening/closure status (the so-called unilateral effects) of evolving microcracks. A closed-form expression of the overall free energy of the microcracked medium is implemented in an appropriate thermodynamics framework to derive a complete damage model for initially anisotropic rocks. The salient features of this model are fully illustrated. Then, its capabilities are demonstrated through an application to a Taiwan argillite subjected to direct tensile loading (including off-axis ones) for which the damage model well captures experimental data (mechanical response, growing damage rocks strength). Finally, the response of the studied rock along a tensile loading followed by an unloading and a reloading in compression is provided in order to illustrate the so-called unilateral damage effects due to microcracks closure.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at : http://www.journals.elsevier.com/international-journal-of-rock-mechanics-and-mining-sciences/
HAL Id:hal-01212103
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Other partners > Université de Liège (BELGIUM)
Laboratory name:
Funders:
F.R.S.-FNRS
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Deposited By: Helene Welemane
Deposited On:03 Sep 2015 13:15

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