Divergence analysis of fracture in main key layer and its span based on coupling of microseismic and electromagnetic radiation

被引：0
|
作者：
Cui D. [1 ,2 ]
Zhu C. [1 ,2 ]
Li Q. [3 ]
Wu H. [2 ]
机构：
[1] Hunan Provincial Key Laboratory of Coal Mining Safety Techniques of Coal Mines, Xiangtan
[2] School of Resources & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan
[3] Institute of Mineral Engineering, Hunan University of Science and Technology, Xiangtan
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2021年 / 38卷 / 06期
关键词：
Electromagnetic radiation; Key stratum; Microseism; Weighting interval;
D O I：
10.13545/j.cnki.jmse.2020.0275
中图分类号：
学科分类号：
摘要：
In view of the weak impact tendency at working face 22116, hydraulic support monitoring was used to reveal the influence of main key layer fracture on periodic pressure at the working face, and combined with coupled monitoring of microseismic and electromagnetic radiation, the distribution characteristics of coupling events of microseismic and electromagnetic radiation at the working face were derived, and the cause of the difference in fracture span of main key stratum was analyzed. The results have shown that during failure and instability of the main key layer, elastic energy is suddenly released, forming an intense vibration and releasing a large number of shock waves. The waves are propagated to, coal and rock mass areas around the stope, causing disturbances and subsequent mine seismic activities. Under the combined action of structural difference, load, and advancing speed of working face, periodic pressure step becomes non-mean. When pressure occurs at the working face, its energy release increases sharply and gradually flattens. Still, changes in energy release and periodic pressure are not entirely consistent, and there is a relative lag. The number of microseismic events is proportional to the amount of energy released, and there is also a lag. The fracture span of main key layer is related to the nature and thickness of overlying strata: the thicker the weak layer, the smaller the fracture span. Therefore, the fracture span of main key layer is non-mean in mountainous areas with non-plain mean value. © 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：1152 / 1157
页数：5
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