Research and application of the 3D DC resistivity method with around working face

Abstract

Based on the theory of the mine DC technique,this paper derives the formula of measuring depth of the 3D DC resistivity method with a round working face and determines coordinates of its recording points.Then,an anomaly body model of for the 3D DC resistivity method with such a working face is established,and the responses characteristics for the cases of pole-dipole,pole-pole and dipole-dipole are analyzed.It is found that the main reason for the low sensitivity of the 3D DC with a round working face is that the electrodes cannot be laid on the inside of the working face and the necessary data points are lacking.In order to improve the resolution of this method,it is necessary to maximize the number of data acquisition points inside the working face.In view of this point,this paper suggests a diagonal dipole mode for data acquisition and an inversion method for stacked data with multiple devices,so that the data collection points on the working face are increased to enhance the accuracy of 3D exploration.The effectiveness of the method is demonstrated by an example of water-rich exploration on the floor of the 8802 working face in a mine.