Application of 3D inversion of audio-frequency electric perspective in detection of water-containing/water-conductive collapse colum

In order to accurately detect water-containing/water-conductive collapse column and realize 3D interpretation of water-containing/water-conductive collapse column, based on electrical properties difference between water-containing/water-conductive collapse column and surrounding rock, water-rich strata of rock-seam in working face floor are explored by use of audio-frequency electric perspective. 3D inversion imaging of audio-frequency electric perspective observation data is carried out to obtain resistivity variation. The results show that 3D inversion of audio-frequency electric perspective can accurately identify spatial position and distribution range of water-containing/water-conductive collapse column, which provides reliable reference for coal mine water prevention.