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In order to reveal the stress precursors of the “3.15” rockburst disaster that occurred in the No. 1 working face of Junde coal mine, the combined stress field inversion including static and dynamic stresses was conducted by using P-wave velocity tomography, and the static high-stress concentration regions were further designated. Simultaneously, the evolution of dynamic stress generated by seven...
•Before rockburst, the sudden rise of MS energy and the lower level of event count.•When rockburst, peak value of fault total area, the lower b value, and |Z|>2.•When rockburst, the largest energy ratio in the dominant low-frequency band.•Before rockburst, abnormal cluster of sources and high-energy events congregation.•Prior to rockburst, the sudden drop of EME amplitude indicating macro-fracture.
Strong rockburst disaster in deep coal mines is easily triggered by the higher static stress of mining coal seam and the dynamic stress wave disturbance generated by hard and thick roof fall. Revealing the frequency-spectrum evolutionary rule of microseismic (MS) signals before and after roof fall is a very important issue for evaluating and forecasting rockburst danger. By experimental tests for...
Intact rock properties and the discontinuity structure of a rock mass are among the most important variables influencing blasting results. This influence is considered to be a composite intrinsic property of a rock mass and is referred to as the blastability of a rock mass. It represents the ease with which a rock mass can be fragmented by blasting. This paper outlines an energy-block-transition...
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