Study On Geological Mine Electromagnetic Detection Technology

With the development of society, the human demand of the coal mine and all kinds of metal ore was also constantly increasing, and coal is a relatively large demand. The measurement technology and instruments was needed to determine the coal structurethe effectively. In recent years, the mine water inrush incidents continued to occur, bringing the economic loss and personnel safety directly. Predict the geological structure of the mine surrounding effectively was very important. The transient electromagnetic detection technology was a kind of exploration method and developed rapidly. It was widely applied. The transient electromagnetic detection technology was through the two field of geological exploration, because it had through high resistivity body ability. Rocks, other geological low resistivity and high resistance of the water body was in sharp contrast, so it could identify low resistivity body physical ability strongly. because of the high resolution, convenient construction, high work efficiency, the application field was relatively wide.First of all, this paper introduced the mine transient electromagnetic detection t echnology a analysed the working principle of mine transient electromagnetic detecti on device, the smoke ring theory, diffusion theory etc. The measurement of multi s mall loop device of measuring point was introduced. The detecting data was proces sed, analyzed, charted interpretation.Secondly, this paper proved that the induced electromotive force under the condition of full space had monotonicity in theory. Two search method was used to solve the problem of the apparent resistivity of working in the whole space. Late time apparent resistivity formula was used to calculate the apparent resistivitylists and the simulation contrast was carried on. By using two point search method, results indicated that the resistivity was calculated as 100.00327Ω·m (error 0.032%). Compared with advanced formula, the accuracy of apparent resistivity was better.Finally, the adverse effects of non zero off effect caused by transient electromagnetic data processing in the transmitter coil was analyzed. In view of the current zero off data processing problem of non, solutions were proposed. In the case of small multi turn loop device, the transmitted waveform and the turn off time were discussed. The receiving coil was derived. Effect of induction electromotive force in the receiving coil was mainly divided into two aspects:the first aspect was the adverse effect of a field; the second was the impact of the two generation of the new two field side. Through theoretical derivation, the first field mixed field were removed, and the more pure of the two field was obtained. Feasible suggestions for Mine transient electromagnetic method with recent exploration area detection device and high precision were provided.