Experimental and Numerical Investigations on the Mechanical Behavior of Fine-Grained Sandstone
Publication: International Journal of Geomechanics
Volume 18, Issue 2
Abstract
The study investigated the mechanical behavior of fine-grained sandstone. Laboratory triaxial cyclic loading tests were conducted on the sandstone under various confining pressures (5, 15, and 20 MPa). The initial yield stresses were approximately 69.0–74.0% of the peak strengths under the different confining pressures, and the residual strengths were 39.5–43.5% of the peak strengths. Based on the experimental results, a coupled elastoplastic damage model for the sandstone is proposed along with a nonassociated plastic potential function. In addition, an isotropic damage evolution model has been formulated with plastic coupling for the sandstone. Furthermore, the numerical formulations of a return mapping algorithm for the implementation of the coupled model are introduced in detail. The numerical results were found to be in good agreement with the experimental data, showing that the model is able to describe the main features of the mechanical behaviors of the fine-grained sandstone.
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Acknowledgments
The work presented in this paper was financially supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant KYCX17_0471, 2017B700X14), the Fundamental Research Funds for the Central Universities (Grant 2016B08014), and the National Natural Science Foundation of China (Grants 51479049, 11672343, 11572110).
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Published In
International Journal of Geomechanics
Volume 18 • Issue 2 • February 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Apr 17, 2017
Accepted: Aug 18, 2017
Published online: Dec 8, 2017
Published in print: Feb 1, 2018
Discussion open until: May 8, 2018
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