Nonlinear Mechanical Behavior of Natural Argillite under Monotonic and Cyclic Loading
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 8
Abstract
This paper presents an experimental study on the mechanical behavior of the argillite that was considered as a possible host rock for a high-level radioactive nuclear waste repository in France. A specific mechanical setup with optical observation was used to investigate the behavior of the material at both the macroscopic scale (cm) and the microscopic scale (100 μm). The full-field strain of the material during mechanical loading was obtained by use of the digital image correlation (DIC) technique. A series of uniaxial compression tests under monotonic and cyclic loading were performed on the Callovo-Oxfordian argillite samples to characterize the corresponding elastic and plastic properties. The results showed that the mechanical behavior (elastic modulus, Poisson’s ratio, and plasticity) depended on water content. The obtained strain-stress curve was nonlinear, and this nonlinearity was mainly related to plasticity and time-dependent effects of the material. The heterogeneous behavior related to the mineralogical composition and the damage induced by mechanical loading are also discussed.
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Acknowledgments
The authors gratefully acknowledge Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), the French agency for radioactive waste management, for financial support and for providing core samples. D. S. Yang acknowledges the support of the Chinese government plan on the Recruitment of Global Young Talents (1000 Young Talents Plan) and the support of the Chinese Fundamental Research (973) Program through the Grant no. 2013CB036006. The authors would like to thank the reviewers for their constructive comments to improve this article.
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Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 8 • August 2013
Pages: 1089 - 1096
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 17, 2012
Accepted: Oct 8, 2012
Published online: Mar 4, 2013
Published in print: Aug 1, 2013
Discussion open until: Aug 4, 2013
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