ISSN: 1003-6326
CN: 43-1239/TG

Vol. 31    No. 12    December 2021

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Mechanical properties and rockburst proneness of phyllite under uniaxial compression
Xue-feng SI1, Lin-qi HUANG1, Xi-bing LI1, Feng-qiang GONG2, Xi-ling LIU1
(1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. School of Civil Engineering, Southeast University, Nanjing 211189, China
Abstract: To investigate the influence of the bedding angle, β, on the mechanical properties and rockburst proneness, uniaxial compression tests were conducted using cylindrical phyllite specimens with different bedding angles. According to the results, the peak stress, peak strain, cumulative acoustic emission counts, and potential energy of the elastic strain exhibited a U-shaped change trend. With an increase in β from 0° to 90°, the failure mode transformed from tensile splitting failure along the bedding plane to shear slip failure along the weak bedding plane. Finally, the failure mode evolved into a tensile splitting failure across the bedding plane. When β=15°, 30°, and 45°, the phyllite specimens exhibited strong, slight, and moderate rockburst proneness, with strong, slight, and moderate shear slip rockbursts, respectively. When β=0°, 60°, 75°, and 90°, the phyllite specimens had extremely strong rockburst proneness, and an extremely strong strain rockburst occurred.
Key words: phyllite; bedding angle; mechanical properties; failure mode transformation; rockburst proneness
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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