Mechanical properties and rockburst proneness of phyllite under uniaxial compression

To investigate the influence of the bedding angle, beta, 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 beta from 0 degrees to 90 degrees, 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 beta=15 degrees, 30 degrees, and 45 degrees, the phyllite specimens exhibited strong, slight, and moderate rockburst proneness, with strong, slight, and moderate shear slip rockbursts, respectively. When beta=0 degrees, 60 degrees, 75 degrees, and 90 degrees, the phyllite specimens had extremely strong rockburst proneness, and an extremely strong strain rockburst occurred.

Automated summary

The influence of bedding angle beta on the mechanical properties and rockburst proneness of rocks was investigated through uniaxial compression tests. The results showed that as beta increased, there were changes in peak stress, peak strain, cumulative acoustic emission counts, and potential energy of the elastic strain. The failure mode evolved from tensile splitting along the bedding plane to shear slip along the weak bedding plane, and ultimately to tensile splitting across the bedding plane. Additionally, rockburst proneness varied with different values of beta, with different types of rockbursts occurring.