Research on correction method of audio frequency electric perspectivedetection for low resistivity body in surrounding rock of roadway

Based on the reasons of narrow roadway space, complex environment, ponding, metal and other roadway surrounding rock low resistance body interference in the process of mine audio frequency electrical perspective construction, the electrode grounding conditions and the environment are quite different, resulting in poor consistency of detection data. Interference often leads to low signal-to-noise ratio of real abnormal signal, which brings difficulties to data processing and interpretation. In order to solve the above problems, this paper puts forward the interference correction method of low resistance body in surrounding rock of mine audio frequency electrical perspective data. On the premise of fully analyzing the influence of the low resistance interference body in the roadway on the detection results, the principle and method of mine audio frequency electric penetration are studied. The low resistance body interference existing in the roadway is numerically simulated, and the data denoising method of wavelet transform is used for processing. The effectiveness of the correction method is verified by the analysis of the measured data. The specific correction method is to group the mine audio electrical perspective data according to different transmitting points and draw the receiving curve; when the receiving curves corresponding to different transmitting points have abnormal distortion near the same receiving point, the data grouped according to the different transmitting points are sorted according to the coordinate position of the receiving point in the group, and the wavelet transform is used to smooth the data When the receiving curve corresponding to the same transmitting point has abnormal distortion, it is sorted according to the coordinate position of the receiving point and processed smoothly to complete the correction of the mine audio electrical perspective data. The results show that before the data correction, the received potential difference data will have a large deviation. The distortion of apparent conductivity caused by the interference of low resistance body at the transmitting end or receiving end can be well dealt with by the data correction method of low resistance body in surrounding rock of roadway, which not only corrects the influence of low resistance interference body, but also retains other possible anomalies. Through the data correction of the measured results, the expected effect of the correction method is verified, which can better solve the problems existing in the audio electrical perspective of the mine. The numerical simulation part of the model is a two-dimensional model. In view of the above problems, if we can establish a three-dimensional model to locate the low resistance interference body in three-dimensional space, it will achieve more accurate correction effect, and achieve the purpose of fine detection of mine audio electrical perspective.