Characteristics of Microseismic Waveforms Induced by Underground Destress Blasting: Comparison With Those Induced by Ground Blasting and Coal Mining

Some industrial activities in mines, such as underground coal mining, destress blasting for preventing rockburst, and ground can cause microseismic occurrence. The waveform contains abundant information on the hypocenter propagation path, which is valuable to study mechanism propagation. Therefore, this adopts multifractal detrended fluctuation analysis (MF-DFA) Hilbert–Huang transform (HHT) method nonlinear time–frequency–energy characteristics of different types waveforms. induced by mining has a higher dominant frequency (above 100 Hz) shorter duration (less than 0.5 s) blasting-induced waveforms (dominant below 25 Hz more 3 s). Furthermore, waveforms, characterized rich spectrum, complex energy attenuation, developed coda wave, clear characteristics, indicate that variable. geological environment superposition effect stress are main reasons. Moreover, distance source also greatly affect characteristics. results show describe release process stress. Based this, efficiency index B e was proposed evaluate pressure relief, classification system developed. Then, evaluation successfully applied 63 rounds Yutian mine. research provide certain reference some work identification microseismic, rock dynamic failure analysis, effect.