A study of the frequency characteristics of downhole penetration by Audio electric perspective method

There are many factors affecting the safe production of coal mines, and mine water damage is the most prominent one. In the field operation, we should find out the old air water, water-rich aquifer and geological structure of the mining face and its surroundings, so as to eliminate the hazards of mine water damage to the people's lives and properties. At present, there are many mature and effective methods for underground anomaly detection, and this paper adopts the audio electro-optical perspective method for early warning detection of mine water-bearing areas. First of all, through the reasoning research on the basic theory of electromagnetic field, the equivalent principle of low-frequency alternating current (AC) and direct current (DC) is deduced, which provides the theoretical basis for the research of audio electro-optical perspective; then, through the COMSOL simulation experiments, the penetration frequency characteristics of the downhole are investigated, and the optimal penetration frequency is found in different depths by comparing the strength and stability of the signals. The results of the study have promoted the significance for the improvement and development of the audio electro-penetration method, and have greater reference value for the prevention and control of water damage in coal mines.