瞬变电磁法在采空区积水与灰岩富水区探测中的应用OA

Aiming at the problem of overlying water damage faced by No.15 coal seam in No.2 mining area of Mishan Coal Mine,and in order to find out the goaf water area of overlying No.3 coal seam and the water-rich area of roof K5 and K2 limestone before mining,on the basis of geological analysis and geophysical characteristics analysis,the transient electromag-netic detection test was carried out,and the detection equipment,loop device and detection parameters were optimized.Through the ground transient electromagnetic detection,the goaf water area of overlying No.3 coal seam and the water-rich area of roof K5 and K2 limestone was preliminarily delineated.In view of the preliminarily delineated distribution range of goaf water and limestone water,the transient electromagnetic method with different hardware,loop device and detection pa-rameters were used to retest the detection results of shallow buried area.At the same time,the DC method retest was carried out to verify the previous detection results.Finally,7 goaf water areas in No.3 coal seam and 6 limestone water-rich areas are determined,which provides technical support for the next safe and efficient green mining and is worthy of further popu-larization and application.