瞬变电磁法在探查工作面上覆煤层采空区富水性中的应用  

Application of Transient Electromagnetic Method in Detecting Water Richness in Goaf of Overburden Coal Seam at Working Face

作　　者：刘百祥 鲜鹏辉 仇念广 LIU Baixiang;XIAN Penghui;QIU Nianguang(China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《煤矿安全》2020年第4期137-141,共5页Safety in Coal Mines

基　　金：“十三五”国家科技重大专项资助项目(2016ZX05045004-007)。

摘　　要：采用地质分析、瞬变电磁探测、钻探验证3种手段相互综合的方法来查明某矿9104工作面上覆煤层采空区的富水区域;通过已有地质资料分析工作面的水文地质情况,确定主要隐蔽水害主要是上覆4-1号煤层采空积水区;针对水害特征选取合适的物探方法,进行最佳的探测设计;根据回风巷、运输巷的探测数据绘制4-1号煤层视电阻率等值线成果切片,准确圈定积水异常区;通过钻探验证瞬变电磁探测成果的准确性。研究结果表明:瞬变电磁探测控制工作面宽度不超过200 m,顶板往上60 m高度内能够获得较丰富的数据,并随着高度的增加空白范围带越来越宽;采用多角度方向设计获取更多测线方向的数据利于绘制成果切片图。按照相对视电阻率值对上覆4-1号煤层采空积水区进行了定性评价,查明了其积水区分布范围。The water-rich area in the goaf of overlying coal seam on the working face is identified by means of geological analysis,transient electromagnetic detection and drilling verification. Firstly, through the analysis of the hydrogeology of 9104 working face based on the existing geological data, it is determined that the main hidden water hazard is the goaf water accumulation area of 4-1 overlying coal seam;then, according to the characteristics of water hazards, appropriate geophysical methods are selected to carry out the optimal detection design;based on the detection data of return air and transport channel, this paper expounds how to draw the slice of apparent resistivity isoline of 4-1 coal seam and delineate accurately the anomalous area of water accumulation;finally,the accuracy of TEM detection results is verified by drilling. The research results show that the width of TEM detecting and controlling working face is not more than 200 m, rich data can be obtained within 60 m height of the roof, and the blank zone becomes wider and wider with the increase of the height;multi-angle direction design can be used to obtain more data of line direction, which is helpful to draw the result slice map, according to the relative apparent resistivity value, the goaf water accumulation area in overlying 4-1 coal seam is qualitatively evaluated, the distribution range of water accumulation area is ascertained.

关 键 词：地质分析 瞬变电磁法 探测设计 成果切片 采空积水区 

分 类 号：TD163.1[矿业工程—矿山地质测量]