Numerical Investigation of Hard Rock Strength and Fracturing under Polyaxial Compression Based on Mogi-Coulomb Failure Criterion
Publication: International Journal of Geomechanics
Volume 19, Issue 4
Abstract
Failure characteristics of rocks under polyaxial compression have been the subject of extensive laboratory testing, although a limited amount of literature is published on the numerical simulation of rock failure under such conditions. The current study was conducted by using a commercially available finite-difference program, FLAC3D, to model the hard rock strength and fracturing under polyaxial compression. The Mogi-Coulomb criterion, where the relevant parameters can be obtained from conventional triaxial tests, was simulated in the software for realistic reflection of the effects of intermediate principal stress on hard rock fracture characteristics. According to the elastoplastic mechanics, the incremental iterative calculation format of the Mogi-Coulomb strain-softening failure criterion was implemented in the program, and the results were compiled into a dynamically linked library (DLL) based on the program interface of secondary development provided by FLAC3D. The numerical results of the calculated peak strength were analyzed and compared with previous experimental data for verification of the effectiveness and accuracy of the simulation models. Laboratory tests with consideration of various intermediate principal stresses were also conducted to investigate the hard rock failure modes under polyaxial compression states. The comparison of experimental results with numerical results using both Mogi-Coulomb and Mohr-Coulomb strain-softening models further explained the validity of the former method. The results showed that proper numerical modeling can be considered for simulating hard rock fracturing under polyaxial compression states for complex stress conditions in future studies.
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Acknowledgments
The authors acknowledge the financial support from the State Key Research Development Program of China (Grant 2016YFC0600706) and the National Natural Science Foundation of China (Grants 51474250 and 51504287).
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Published In
International Journal of Geomechanics
Volume 19 • Issue 4 • April 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Oct 30, 2017
Accepted: Aug 30, 2018
Published online: Jan 15, 2019
Published in print: Apr 1, 2019
Discussion open until: Jun 15, 2019
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