无线电波探测瓦斯富集区理论与方法

Theory and method of coal seam gas enrichment area based on radio wave perspective detection

  • 摘要: 为了准确预测煤层回采工作面瓦斯富集区情况,基于矿井无线电波透视理论,对瓦斯压力与无线电波透视曲线变化关系进行了物理试验,并根据井下回采工作面实际情况进行了煤层瓦斯富集区的无线电波曲线变化特征的正演模拟,探讨了无线电波透视探测瓦斯富集区的曲线特征,并在煤矿井下进行试验。研究得出,煤层瓦斯压力与无线电波透视衰减曲线呈现一致性变化,煤层瓦斯富集区的存在会造成无线电波坑透的异常区域,相对于正常煤层接收机接收值来说,煤层瓦斯富集区的异常曲线整体呈现接收值偏小,而且中间区域衰减的更大些,两边相对衰减的小些,形成一个“蝙蝠”形状。经过在煤矿井下的实验验证,无线电波透视成果结合地质资料分析,可以用来较为准确地划分煤与瓦斯突出危险区。

     

    Abstract: In order to accurately predict the coal gas enrichment area of coal seam mining face, based on the theory of mine radio wave perspective, this paper investigated the relationship between the coal gas pressure and the radio wave perspective curves.According to the actual situation of coal mining face, the variation characteristics of the radio wave curve in the coal seam gas enrichment area were simulated, and the feasibility of detecting coal seam gas was discussed.Also, some experiments were conducted in underground coal mine.This study concluded that the gas pressure of coal seam and the radio wave attenuation curve showed a consistent change, the coal seam gas existences could cause the abnormal region of radio wave penetration.Compared to the received value of normal coal seam receiver,the abnormal curve of coal seam gas showed a whole smaller received value,and the attenuation was larger in middle area of model,the relative attenuation was smaller on both sides of model.The pattern formation was a "bat" shape.Through the experimental verification in the coal mine,the radio wave perspective results combined with geological data analysis could be used to accurately divide the coal gas outburst dangerous area.

     

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