Due to the easy occurrence of ground subsidence or cracking in goafs,in order to reduce the probability of safety accidents,geological engineering survey technology for large area dense coal mine goaf was proposed.A survey network on a coal mine area was set up,transient electromagnetic technology to collect the apparent resistivity of the survey line was used and the contour section of the ap-parent resistivity was drew,the location of the goaf on the plan in combination with the apparent resistivity analysis results of multiple survey lines was marked,and the area and volume of the goaf in combination with the horizontal and vertical coordinates of the location of the goaf to complete the geological engineering survey of the goaf were calculated.The results indicate that there are three goafs in the study area,with two goafs being waterless in No.1 mining area and the other goaf being a water filled mine goaf in No.2 mining area.This is due to the relatively low-lying terrain of the area,coupled with the fragmentation of rock layers after coal mining,resulting in a large number of cracks,allowing surface water to gradually seep into the goaf.This study can provide guidance for the further develop-ment of geological engineering survey technology in coal mine goafs.
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