Particle simulation of the failure process of brittle rock under triaxial compression |
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Authors: | Ming Xia Ke-ping Zhou |
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Institution: | (1) Itasca Consulting Group Inc, Minneapolis, MN, USA |
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Abstract: | In order to investigate the failure process of brittle rock under triaxial compression through both experimental and numerical
approaches, the particle simulation method was used in numerical simulations and the simulated results were compared with
those of the experiment. The numerical simulation results, such as fracture propagation, microcrack distribution, stress-strain
response, and damage patterns, were discussed in detail. The simulated results under various confining pressures (0–60 MPa)
are in good agreement with the experimental results. The simulated results reveal that rock failure is caused by axial splitting
under uniaxial compression. As the confining pressure increases, rock failure occurs in a few localized shear planes and the
rock mechanical behavior is changed from brittle to ductile. Consequently, the peak failure strength, microcrack numbers,
and the shear plane angle increase, but the ratio of tensile to shear microcracks decreases. The damage formation during the
compression simulations indicates that the particle simulation method can produce similar behaviors as those observed through
laboratory compression tests. |
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Keywords: | |
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