Application of CSAMT Method in Mine Gob Detection

The paper analyzed and summarized the electrical characters of coal mine goaf, and elaborated the basic theory and operating procedure of coal mine goaf detection by using controlled source audio-frequency magnetotelluric sounding method. The specific effect of the controlled source audio-frequency magnetotelluric sounding method in goaf detection was summarized by combining practical application of goaf detection. The results showed that controlled source audio-frequency magnetotelluric sounding method could accurately and effectively detect goaf and water logging range, which had a better reflection for the fluctuation of high resistance limestone top surface in Ordovician.