Acoustic Emission and Fractal Precursory Characteristics of Coals with Different Bursting Liabilities in Loading Failure Process

Aimed at investigating the differentiation of acoustic emission (AE) signals and fractal precursory characteristics between strong, weak, no bursting liability coals under uniaxial compression, as well improving accuracy rockburst monitoring early warning by AE techniques, we experimentally studied evolution law differences ring count rate, energy correlation dimension different loaded YAW4306 electric mechanical test system CTA-1 monitor. Our experimental results indicated that coal samples with liabilities showed a similar “sharp increase-calm-sharp increase” before their main rupture. The active points emitted from appeared about 85∼90%, 75∼78%, 51∼55% peak stress, respectively. stronger coal, shorter duration rupture postpeak failure stage, greater rate in counts had obvious characteristics, values strong weak presented phenomenon “fluctuating rise to value-sharp drop-continuous decrease,” which can be used information failure.