Coupled Plasticity and Damage Constitutive Model Considering Residual Shear Strength for Shales
Publication: International Journal of Geomechanics
Volume 20, Issue 8
Abstract
Shales are the most common materials on the Earth's surface that are frequently encountered in various energy, environmental, and engineering applications. Numerically predicting the mechanical behavior of shales is of great importance in the geomechanics community. A coupled plasticity and damage constitutive model is developed in this study to describe the mechanical behavior of shales that spans the prepeak, peak, and postpeak regions. A concept of a damaged part of geomaterials, which possesses residual shear strength, is introduced in the proposed model. A thermodynamic conjugate force is presented by accounting for the residual shear strength of the damaged part. Procedures to determine the model input parameters and an algorithm to implement the constitutive model in a numerical code are presented. Validation against experimentally observed stress–strain curves of shales shows that the proposed model can predict the mechanical behavior of shales under various stress paths and confining stresses from the pre- to postfailure regimes.
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Acknowledgments
The authors wish to gratefully acknowledge the support from the University Transportation Center for Underground Transportation Infrastructure (UTC–UTI) at the Colorado School of Mines for funding this research under Grant No. 69A3551747118 from the U.S. Department of Transportation (DOT). The opinions expressed in this paper are those of the authors and not of the DOT.
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Published In
International Journal of Geomechanics
Volume 20 • Issue 8 • August 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 4, 2019
Accepted: Jan 16, 2020
Published online: May 21, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 21, 2020
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