Optimization of Surface Detection Technology and Method of Mine Goaf

In order to detect the mine goaf distribution scope and the existed safety dangers in Ordos Mining Area, there were four surface goaf detection technolog ies, including the high density resistivity method, the transient electromagnetic method, the EH-4 geoelectromagnetic method and the shallow seismic method, applied t 0 prepare the comprehensive cross sections and time cross sections of the video resistivity with the field data collection, data pre-processing (including interference sig nal elimination) and the reversed evolution calculation to explain the geometry and substance property features and to establish a set goaf detection technical method s uitable for the coal mines in Ordos. The results showed that the high density resistivity method and the shallow seismic method would be suitable for the detection of the shallow goaf and the detection depth would be less than 200 m;the transient electromagnetic method would be suitable for the detection of the goaf in medium depth an d the detection depth would less than 600 m;the EH-4 geoelectromagnetic method would be suitable for the detection of the goaf in the deep depth and the detection de pth would be less than 1 000 m.