Abstract:
Aiming at the problem of hard roof and high stress mining conditions, a combined monitoring and early warning technology of near and far field is proposed. The time-space evolution laws of microseismic events during the mining of coal mining face are analyzed by using the ARAMISM/E microseismic monitoring system. The values of rock burst warning indexes are determined respectively, and the combined index is used to forecast the rock burst. The electromagnetic radiation intensity and the prediction value of electromagnetic radiation intensity of working face and the two mining roadways were determined respectively. The stress risk contours of coal body were analyzed and the impact risk was evaluated. The application examples show that the combined monitoring and early warning technology of the near and far field of the rockburst is used to predict the rockbursts several times, and the better prediction effect is achieved.