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综合物探方法探测煤矿采空区及积水区技术研究

Study on Technology of Comprehensive Geophysical Method Exploration of Mine Goaf and Water Accumulated Area

  • 摘要: 针对煤矿采空区透水事故频繁发生的问题,采用浅层二维地震法和瞬变电磁法对采空区分布范围及其积水情况进行综合物探,结果表明:浅层二维地震对煤层反射波变化特征反映明显,完整煤层地震同相轴稳定、连续,采空区地震同相轴断续、扭曲或无明显反射,正常煤层和采空区交界处特征变化明显,圈定采空区边界及范围效果较好,分辨率高;通过对浅层二维地震和瞬变电磁测线重复区域的详细分析,以浅层二维地震圈定的采空区范围为准,确定瞬变电磁法在正常煤层、采空区和采空积水区的视电阻率阈值范围,可用来指导其他测线的解释工作;瞬变电磁对低阻异常反映灵敏,能够依据视电阻率的变化来判断采空区的积水性,有效弥补了浅层二维地震法无法判断采空区积水性的局限;充分发挥浅层二维地震和瞬变电磁法各自的优势,提高了采空区及其积水情况的探测效果。

     

    Abstract: According to problems of the mine water inrush accidents frequently occurred in mining goaf, the shallow 2D seismic and method transient electromagne tic method were applied to study the comprehensive geophysical exploration on the mining goaf distribution scope and the water accumulation conditions.The results sh owed that the shallow 2D seismic method could clearly reflect the reflected wave variation features of the seam.A complete seismic event of the seam was stable and C ontinued and the seismic event of the mining goaf was discontinuous, distortion or no obvious reflection.The features of a junction between a normal seam and goaf var ied obviously and an effect of the set goaf boundary and scope would be good and the resolution would be high.With a detail analysis on the survey line repeated area of the shallow 2D seismic and transient electromagnetic, taking the goaf scope set with the shallow 2D seismic as a base, the apparent resistivity threshold scope of th e transient electromagnetic method in the normal seam, goaf and goaf water accumulated area was determined and could be applied to guide the explanation work of ot her survey line. The transient electromagnetic would specially reflect sensitively to the low resistance and could judge the water accumulation in the goaf based on the V ariation of the resistivity and could effectively make up the limit of shallow 2D seismic method hard to judge the water accumulation in the goaf. The advantage of the sh allow 2D seismic and transient electromagnetic method were used fully, the survey effect of the goaf and water accumulation condition could be improved.

     

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