基于瞬变电磁法的煤矿采空区积水探测

Detection of water accumulation in coal mine goafs based on transient electromagnetic method

为探明煤矿采空区和积水区的位置,根据古交金鑫煤矿实际地质条件,采用大定源瞬变电磁法探查研究区的地下电性分布情况。由观测数据获得视电阻率值,进而分析各测线的视电阻率拟断面和顺层等值线特征。结果表明,视阻率的高值圈闭特征与单纯采空区对应,低值圈闭特征为采空区积水引起。2~#~4~#煤层的部分探测结果与实际开采情况相符,验证了探测方法的有效性。该研究可为矿区后续开采和灾害防治提供依据。

This paper is an effort to identify the locations of goaf and water accumulation area in a coal mine.The study involves investigating the underground electrical distribution in the study area using the transient electromagnetic method(TEM),as is exemplified by actual geological and terrain conditions in Jinxin coal mine in Gujiao;and processing the observed data to obtain the corresponding apparent resistivities and thereby analyzing each profile and coal seam contour of apparent resistivities.The results show that the apparent resistivity trap with high value corresponds to a mined-out area;the trap with low value is caused by accumulated water;part of detected results in No.2 to 4 coal seams are consistent with the actual mining situation,thus verifying the effectiveness of the detection method.The research could serve as a basis for subsequent mining and disaster prevention.