急倾斜煤层复杂条件下矿震时空演化规律研究

Study on Temporal and Spatial Evolution of Mine Earthquake in Steeply Inclined Coal Seam under Complex Conditions

为明确急倾斜煤层复杂条件下工作面开采过程中矿震的时空演化规律,确定影响冲击和矿震显现的主要开采和地质因素,在某矿急倾斜水平分段轻放工作面开采过程中进行微震监测。结果表明,急倾斜轻放工作面的矿震强度较急倾斜综放工作面有所降低。2#煤层工作面回采时,矿震事件主要集中在煤层顶板岩层中,而临近下位4#煤层工作面生产时,矿震主要发生在煤层底板岩层中。研究结果可为同类型矿井工作面冲击地压分区管理、分类防治提供指导。

In order to clarify the temporal and spatial evolution law of mine earthquake in the mining process of working face under complex conditions of steeply inclined coal seam,and determine the main mining and geological factors affecting the impact and mine earthquake appearance,the microseismic moni⁃toring was carried out in the mining process of a steeply inclined horizontal sublevel caving face in a mine.The results show that the seismic intensity of steeply inclined light caving face is lower than that of steeply inclined fully mechanized caving face.During the mining in the 2#coal seam face,the ore earthquakes were mainly concentrated in the roof rock of the coal seam,while near the production of the lower 4#coal seam face,the mine quakes mainly occurred in the coal floor rock.The research results can provide guidance for the divisional management and classified prevention of rock bursts in the working faces of the same type of mines.