多层采空区调查中瞬变电磁法的应用

有些煤层存在2层或2层以上的采空区,目前很多方法只能有效地探测最顶层采空区。针对这一情况,根据多层采空区的地球物理特征,利用瞬变电磁法,通过分析多测道电压剖面图和拟视电阻率断面图,准确地探测出了多层采空区的位置。结果表明,根据多层采空区地球物理特征,利用瞬变电磁法准确探测多层采空区的位置划清责任是形之有效的方法。

THE APPLICATION OF TRANSIENT ELECTROMAGNETIC METHOD TO THE DETECTION OF MULTILAYER WORKED-OUT AREA OF COAL SEAM

Some coal seams have two or more than two layers of worked-out areas.Many methods used at present can only detect the worked-out area at the top.Aimed at solving this problem,the authors,on the basis of geophysical characteristics of the worked-out area and by using the transient electromagnetic method and analyzing the multi-channel voltage profile and the apparent resistivity section,accurately located the position of multi-layer worked-out areas.Practice has proved the effectiveness of the above method put forward by the authors.