Meikuang Anquan (Jul 2022)
Joint monitoring of surface and underground micro-seismic monitoring technology in rockburst coalmine
Abstract
Underground micro-seismic monitoring systems are commonly used in rockburst coal mines for monitoring and early warning. However, in a single near-horizontal coal seam or a near-upright coal seam in horizontal slicing mining, the vertical positioning accuracy is generally unsatisfactory due to the insufficient height difference of the underground micro-seismic network, it is impossible to effectively analyze and determine the key rock formations caused by the impact. Taking a near level rockburst coal mining face in Ordos Mining Area as an example, the “vertical height difference effect” of the micro-seismic positioning error is theoretically analyzed, and the joint monitoring technology of surface and underground micro-seismic monitoring is proposed. The special surface micro-seismic pickup is arranged on the ground to form a network of micro-seismic monitoring stations up and down the well, and apply it to mines with rock bursts near horizontal coal seam. The research shows that when the underground micro-seismic sensor network is in a near horizontal state, the source vertical positioning error is large due to the large vertical maximum gap angle, which is the main reason for the lack of micro-seismic vertical positioning accuracy. Based on the ARAMIS M/E micro-seismic monitoring system, the ARP special surface micro-seismic pickup is added to increase the z-coordinate gap, forming a joint monitoring station network of surface and underground micro-seismic monitoring, which effectively improves the micro-seismic monitoring height and vertical positioning accuracy. The joint monitoring technology of surface and underground micro-seismic monitoring in Menkeqing Coal Mine reveals the strata level and height that induced mine earthquakes, and improved the mine’s technical level in solving frequent mine earthquakes and the pertinence of measures taken; in Hongqinghe Coal Mine, the joint micro-seismic monitoring technology is applied to determine the location and height of the main control strata of impact disaster, and reveal the impact disaster of high thick roof.
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