Precursor information analysis on acoustic emission of coal with different outburst proneness
To master the precursor information of burst coal bursting failure is the bottleneck problem to scientifically forecast rock burst,and the precursor information study on acoustic emission of coal with different outburst proneness under stress loading is one of the important ways for rock burst forecasting. The research results presented in this paper show that,as the level of coal's outburst proneness increasing,the counts of coal vibration and energy of acoustic emission were concentrated at high stress region,with the time proportion of the elastic stage increasing while time proportion of plastic stage decreasing. The width of the main frequency channel changed little,tending to a concentration. The strength of the main frequency channel increased with varying degrees during the elastic stage,plastic stage and breaking stage,the growth of the strength of frequency increasing as the coal's outburst proneness becoming larger. The stress increased as the b-value decreasing,tending to close to breaking strength of the coal.