Goal Mine Detection with Transient Electromagnetic Method and Magnetic Method

Abstract

Coal mine goaf is rather severe safety hazard during the process of coal mining. Besides, it is also difficult to be detected accurately. Based on the electrical, magnetic and physical properties of coal mine goaf, the paper proposes the comprehensive use of magnetic method and transient electromagnetic method to detect coal mine goaf. Within the research region, the magnetic method is used to measure the area, and designate key zones. Then, transient electromagnetic method is adopted to survey the key regions and learn about electrical resistivity underground. Comprehensive analysis is conducted on magnetic susceptibility and electrical resistivity to infer the spatial distribution features, such as the possible scale and depth of goaf. Drilling data prove the reliability of joint detection and explanation method.