Abstract: Microseismic and stress real-time monitoring techniques were applied to measure coal-rock failures and stress variations during mining process of LW11041 in Fangshan coal mine. Combined with methane emission and methane drainage data, the relation of coal-rock failure, stress variation and methane emission were studied in this paper. The results show that the peak energy of microseismic events occurs earlier than that of extreme coal stress and methane extraction index, while the peak value of methane emission occurs later than that of methane extraction index. Therefore, energy variation of microseismic events can be used to predict coal stress variation and methane emission around the coal face. In addition, the periodic weighting of basic roof is the main reason to result in the periodic changes of methane emission by ventilation. When the basic roof breaks periodically, the methane emission in goafing increases, the methane concentration by ventilation in face also increases, and the methane mainly comes from the methane accumulation in goafing.

Key words: fully-mechanized mining face, microseismic monitoring, stress real-time monitoring, coal-rock failure, methane drainage, methane emission