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受载煤体变形及破裂时能够产生微震、声发射和电磁辐射信号,可以根据微震、声发射和电磁辐射信号的变化规律来评价回采工作面煤体应力状态。针对回采工作面煤体应力状态的地球物理响应,对跃进矿23130工作面进行了现场测试,结果表明微震、声发射和电磁辐射信号在应力集中区较强,在松弛区和原始应力区较弱,信号的变化与煤体的应力状态的分布有较好的对应关系。
When the loaded coal body is deformed and ruptured, it can generate microseismic, acoustic and electromagnetic radiation signals, and the stress state of the coal face in the working face can be evaluated based on the variation law of microseismic, acoustic and electromagnetic radiation signals. According to the geophysical response of the coal body stress state in the working face, a site test was conducted on 23130 face of Yuejin coal mine. The results show that the signals of microseismicity, acoustic emission and electromagnetic radiation are stronger in the stress concentration area and weaker in the relaxation area and the original stress area , The signal changes and the distribution of the stress state of coal has a good correspondence.