Detecting floor geological information bymine DC perspective and 3D inversion

Safe and efficient coal mining and even intelligent mining require a more precise identification of the geological conditions of the surrounding rock of the coal seam, and the current commonly used mine Direct Current (DC) perspective method has not fully understood the detection range and ability, which restricts the application effect of this method. In order to realize the fine detection of mine DC perspective technology, the authors conducted indepth research on it through numerical simulation and measured data. The display forms of the geological body with different shapes, different electrical properties, and different spatial positions in the DC perspective potential difference curves and apparent resistivity curves were analyzed, and the synthetic data were used to fullspace high resistivity coal seam constrained inversion and halfspace inversion. The 3D inversion results of synthetic data and measured data show that the DC electrical perspective curves of different anomalous bodies near the bottom of the working face have the opposite electrical properties of the anomalous bodies. When there is a certain distance between the abnormal body and the bottom of the working face, the electrical perspective curve can show the same electrical properties as the abnormal body. The anomalous body has a greater impact on the electroperspective curve when it is near the receiving point than when it is near the power supply point. The 3D inversion results of the mine DC perspective can accurately interpret the electrical properties and horizontal distribution information of the geological body. The full space constraint inversion results are consistent with the halfspace inversion results and the halfspace inversion program or software can be used to invert the fullspace electrical perspective data under the shielding of highresistivity coal seams. Due to the shielding effect of a high resistance coal seam, when the electrodes are laid at the bottom of the working face, the influence of the low resistivity body located in the roof on JP2the observation data can be ignored. With the development of wireless communication and parallel systems, the mine DC method can obtain multiple devices data in one construction, and combined with 3D inversion, it can precisely interpret the electrical information near the working face.