Abstract
Microseismic (MS) or acoustic emission (AE) system has been used for rock burst warning in heading face for a period of time, but the main problem focus on how to accurately obtain the target coal fracture event (CFE) or how to remove interference signals. In the study, the location and characteristics of CFEs in a heading face are determined, and the commonly STA/LTA (short-term to long-term average) method is used to distinguish CFEs from interference signals, results show that STA/LTA method cannot substantially remove the large number of interference signals in heading face. Based on this fact, a multi-channel verification index is proposed to pick up CFEs in heading face, the index can preliminarily provide a significant accuracy rate for CFEs and reflect the abnormal stress field of heading face, which lays an important reference for monitoring and warning index selection of rock burst in heading face.
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