关键词: 井下采空区, 井下瞬变电磁, 高密度电阻率法, 多匝重叠回线, 井下铁矿

Abstract: For the detection technology problems of underground iron ore goaf, the tunnels of different mining middle and length are detected and evaluated in the goaf by TerraTEM on the basis of the transient electromagnetic method (TEM). Several contrast tunnels are tested and verified by combining HDRM. Meanwhile geological projects are put into effect for some tunnels. It is found that the distribution of the superficial layer goaf in underground iron ore is to be ascertained through TEM with appropriate collect parameters and detection devices. The TEM can distinguish the electrical property of different media better and display the burial depth and scale of abnormal body more accurately. Moreover, there is no detection dead zone which exists in the traditional geophysical prospecting methods, and the detection distance and length are not restricted. Therefore, it can detect the electrical property difference in a fixed point depth range, provide a thorough investigation of the goaf and suspect collapse areas of a certain depth below the mining tunnels. It is important for the safety assurance of underground iron ore mine production.