煤与瓦斯突出前兆低频电磁信号接收技术研究
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摘要
本文采用理论分析、实验室试验、数值模拟和现场应用相结合的方法系统研究了煤与瓦斯突出前兆低频电磁信号在煤层中的传播衰减规律,设计了低频磁棒天线并实测了其敏感频带和有效接收范围,结合工作面生产工艺等因素,确定了采掘工作面突出前兆电磁辐射信号的接收方法,并在现场进行了监测和定位的应用。在相关研究成果的基础上,建立了接近煤矿井下实际的平板波导传播模型,建立了煤岩低频电磁信号穿透煤层实验系统,设计了低频磁棒天线并进行了性能测试;在频率变化、强度变化下对不同粒度的煤样进行了穿透实验,并与自由空间衰减规律进行了对比,得到了煤岩低频率电磁信号在煤层中的衰减规律;利用CST软件对掘进工作面电磁信号的衰减分布进行了模拟,直观地分析了突出源不同位置、不同强度和不同频率下电磁信号的衰减分布规律。结合采掘工作面生产工艺等因素确定了采掘工作面低频电磁信号的监测方法和天线布置方法,在现场利用ZDKT-1瞬变磁振监测系统进行了爆破时电磁信号异常监测和突出源定位的应用。本文创新性地用低频电磁信号来预测煤与瓦斯突出,并初步在现场进行应用,为煤矿井下动力灾害防治提供理论和技术支持。
In this paper, we study the attenuation rules of coal and gas outburst’s precursory lowfrequency electromagnetic signal traveling in the coal seam based on the theoretical analysises,experiments, numerical simulations and field applications, then design a low frequency barmagnet antenna which sensitive band and effective frequency range have been tested. Combiningwith the influence factors of production process, we introduce an effective method to receive lowfrequency electromagnetic signal in mining working face and apply the monitoring and locating incoal mine. Based on the research, the paper establishes a planar waveguide model andexperimental system of low frequency electromagnetic signal penetrating the coal and rock seam,which is similar to the real conditions. We also test the penetration performence of the designedlow frequency magnetic bar antenna with different frequencies and intensities on differentgranularities of coal samples. Comparing with the attenuation rules under vacuum, we obtain theattenuation rules of low frequency electromagnetic signal from coal petrography in the coal seam.Furthermore the attenuation attribution of low frequency electromagnetic signal in drivage facehas been simulated by CST software through different parts, frequencies and intensities. The lowfrequency electromagnetic signal monitoring and layout of antennas were determined combiningwith the influence factors of production process. As the application, we employed ZDKT-1systemto monitor abnormal electromagnetic and locate the outburst source in blasting process. This paperfirstly proposes a point of view that low frequency electromagnetic signal can be utilized toforecast dynamic disasters and provides theoretical and technical support for outburst prediction ofmining face.
引文
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