Abstract:
In order to study the evolution of rock acoustic emission parameters under mining paths and the differences in rock fracture damage process, the acoustic emission signals of marble in uniaxial compression test, direct tensile test and indirect tensile test were detected.The spatiotemporal evolution of the acoustic emission parameters and the rock damage development in different loading modes were analyzed.The results showed that the order of the total number of acoustic emission events and acoustic emission counts in different loading modes was uniaxial compression test>direct tensile test>indirect tensile test.In the direct and indirect tensile tests, the energy release of the acoustic emission signals was concentrated at the peak stress and then rapidly weakened, whereas in the uniaxial compression test, a large number of acoustic emission signals still existed at the post-peak stage, accompanied by a violent acoustic emission energy release.The generation mechanisms of acoustic emission sources and the corresponding damage modes in rocks under different loading modes are different.In addition, the acoustic emission
b values of the acoustic emission events under different loading modes decreased with the increase of stress levels, and the order of the stress levels at which the
b values decreased sharply was uniaxial compression test<direct tensile test<indirect tensile test.