Hebei Coal Science Research Institute Co. Ltd.
Key Laboratory of Mine Water Disaster Detection, Prevention, and Control, National Mine Safety Administration
Hebei Province Key Laboratory of Mine Microseismics
State Key Laboratory of Energy Backfilling Mining Technology
Hebei Backfilling Mining Technology Co., Ltd.

工作面倾斜长度变化或者调采是增大工作面突水风险的重要因素之一。为揭示不等长工作面由于倾斜长变化而呈现出的时空分布特征及其影响因素，以冀中能源峰峰集团九龙矿15240工作面为工程背景，对微震实时监测数据进行分区研究并统计对比分析。结果表明：不等长工作面微震事件分布受到倾斜长度、采动速度、巷道位置、物探异常区等多因素影响，规律更为复杂，且时空分布具有明显的分区特征。由窄变宽阶段微震事件频次明显增大，宽面阶段超前影响距离最远。由窄变宽区域、调采区域，底板事件密度增大，扰动深度增大，应注意加强水文地质观测。通过平面、垂向不同视角展示不等长工作面事件空间分布特征，进而圈定由于工作面倾斜长变化而出现的应力集中区，根据微震事件发育特点分析顶底板煤岩体破坏程度和深度，可对突水风险增大区域进行预警。研究结果可为不等长工作面回采安全或微震监测水害预警提供参考。

The varying length of a working face along its dip direction or adjusting mining significantly increases water inrush risks of the working face. This study aims to reveal the spatio-temporal distribution of microseismic events on an unequal-length working face arising from changes in its length along its dip direction, as well as the influencing factors. With the No. 15240 working face in the Jiulong Mine of the Jizhong Energy Fengfeng Group as the engineering background, this study performed a zoning-based study and statistical comparative analysis of the real-time monitoring data on microseismic events. The results show that the microseismic event distribution on an unequal-length working face is influenced by multiple factors such as the working face’s length along its dip direction, mining speed, tunnel position, and the presence of zones with geophysical anomalies, exhibiting a complex distribution pattern. Furthermore, the spatio-temporal distribution of microseismic events displays pronounced zoning. Specifically, the frequency of microseismic events significantly increases from the narrow to wide stage of the working face, with the wide stage exhibiting the farthest leading influence distance. In working face' narrow-to-wide transition zone and adjusting mining zones, the density and disturbance depth of microseismic events increase on the coal seam floor. Therefore, it is necessary to strengthen hydrogeological observations in these zones. The display of the planar and vertical spatial distribution characteristics of microseismic events on an unequal-length working face allows for delineating the stress concentration zones formed by changes in the working face's length along its dip direction. Analyzing the degree and depth of damage to coals on coal seam roofs and floors based on microseismic event characteristics facilitates early warning for areas with increased water inrush risks. The results of this study can provide a reference for the safe mining of an unequal-length working face or microseismic monitoring-based water disaster warning.

邢台市社会发展领域专项科研项目(2023ZC319)

周金艳，杨洪增，高杰涛. 煤矿不等长工作面微震事件空间分布特征及其影响因素[J]. 煤田地质与勘探，2024，52(4)：1−9.

ZHOU Jinyan，YANG Hongzeng，GAO Jietao. Microseismic events on unequal-length working faces in coal mines: spatial distribution and its influencing factors[J]. Coal Geology & Exploration，2024，52(4)：1−9.