Three-Dimensional Nonlinear Dynamic Strength Criterion for Rock
Publication: International Journal of Geomechanics
Volume 16, Issue 2
Abstract
It is assumed that rocks contain three-dimensional (3D) penny-shaped microcracks. The Mode II and III dynamic stress-intensity factors at the tips of 3D penny-shaped microcracks are determined. The orientation angle of microfailure in rock materials is obtained to describe the dynamic failure of rocks. The relationship between the microfailure orientation angle and stress components is derived from the dynamic fracture criterion. Failure-characteristic parameters of penny-shaped microcracks under dynamic triaxial compressive condition are defined; these are an invariant. A 3D nonlinear dynamic strength criterion of rocks is established using the micromechanical method. The 3D nonlinear strength criterion is novel, and is not found in the existing literature. By comparison with experimental data, it is shown that the present 3D dynamic strength criterion is in good agreement with the experimental results.
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Acknowledgments
The authors thank editors and two anonymous reviewers for helpful suggestions, which have allowed us to clarify and improve the manuscript. This work was supported by the National Natural Science Foundation of China (Grant Nos. 51325903 and 51279218), Project 973 (Grant No. 2014CB046903), Natural Science Foundation Project of CQ CSTC (Grant Nos. cstc2013kjrc-ljrccj0001 and cstc2013jcyjys0005).
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Published In
International Journal of Geomechanics
Volume 16 • Issue 2 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 2, 2014
Accepted: Feb 21, 2015
Published online: Jun 23, 2015
Discussion open until: Nov 23, 2015
Published in print: Apr 1, 2016
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