Statistical Micromechanics-Based Modeling for Low-Porosity Rocks under Conventional Triaxial Compression
Publication: International Journal of Geomechanics
Volume 18, Issue 5
Abstract
It is acknowledged that porosity and voids encapsulated in rocks significantly affect the mechanical behavior of specimens from laboratory observations. In this study, a proposed conceptual porosity model was idealized to evaluate the change of voids fraction caused by straining, and the equivalent porosity was introduced to indirectly characterize material properties on a macroscopic scale. A micromechanics-based analytical method was developed to track the progressive failure of specimens induced by the localization strains; in particular, the shear-failure factor was assumed to be a cumulative distribution function of the shear straining. On this basis, a phenomenological constitutive model for low-porosity rocks, generally within 5%, was further developed with only a few model parameters. In addition, predictions of multiaxial stress-strain relation and volumetric strains were examined by comparing the observed results from laboratory data. A parametric study was carried out to address how the variation of porosity impacts mechanical behaviors of rocks in the proposed model.
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Acknowledgments
The research was granted by the National Natural Science Foundation of China (Grants 51608540 and 51478178), and supported by the Fundamental Research Funds for the Central Universities. The authors gratefully thank the anonymous reviewers for their constructive criticism and valuable suggestions.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 5 • May 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Mar 30, 2017
Accepted: Oct 27, 2017
Published online: Feb 22, 2018
Published in print: May 1, 2018
Discussion open until: Jul 22, 2018
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