Research on meatal goaf detection: a case study on the Duan Village-Leigou monohydrallite goaf

The increasing scope and depth of the mining formed more and more goaf. The geological disasters such as collapse in goaf bring the hidden danger to the people. Therefore, it is particularly important to accurately locate the goaf in the mining area. This article take a section of the Duan Village-Leigou monohydrallite goaf in Mianchi county of Henan Province as an example, using five kinds of detection test including seismic reflection method, direct current method, high density resistivity method, the electromagnetic imaging and radon emanation measurement method. The results from detection and comprehensive analysis of the eight known mine show that it’s suitable to adopt high density method when the embedded depth is about 20.0 m or less than 20.0 m, polar distance of which chould be 2.0 m; for tunnel buried deep in above 20.0m the magnetotelluric imaging (EH-4) method is appropriate, choosing suitable polar distance and dot pitch 2.0. Through the detection of Duan Village-Leigou monohydrallite goaf, research suggests the high density resistivity method and the method of the earth electromagnetic imaging are the most suitable methods to detect the goaf.