关键词: 煤与瓦斯突出, 探测预警, 微震(MS) 监测, 震动波计算机断层扫描(CT)技术, 区域应力场

Abstract: In order to address lack of regional on-line detection and early warning technology in coal and gas outburst coal mines, MS technology, which could correctly reflect dynamic and static loads, was applied in outburst-prone mines, and spatial and temporal evolution characteristics of driving-induced MS signals were studied. Then, distribution characteristics of regional stress field in heading face were calculated based on seismic wave CT before relationship between abnormal stress area and accident locations was compared and analyzed. At last, prospect of MS technology's application in outburst-prone mines was explored. The results show that MS events in soft coal seam are mainly distributed in stress concentration area, excavation disturbance area and tectonic influence area. When heading face gradually approaches geological structures, MS energy and events will tend to increase. The results of regional stress field based on seismic wave velocity inversion are consistent with stress concentration caused by main roadway uphill, stopping line and heading face. The location of outburst event in Jinjia coal mine corresponds well to abnormal stress area detected by CT technology, and outburst are more likely to occur where velocity gradient changes greatly.

Key words: coal and gas outburst, detection and early warning, microseismic (MS) monitoring, seismic wave computed tomography(CT) technique, regional stress field