Status and prospect of the application of mine DC electrical method technology

As an efficient means of geophysical exploration, mine DC electrical method plays an important role in accurately circling various types of anomalous zones. The development of underground detection is limited by many factors due to small space, interference and high technological requirements. Therefore, it is significant to establish a mine DC electrical method technology system that matches the intelligent mine production under the rapid extraction mode. The paper gives an overview of mine DC electrical method from three aspects, namely, basic principle, technology development and classification. It summarizes the latest progress of mine DC electrical method used in roof and floor exploration, roadway advance detection, and anomaly area exploration in the working face, etc. It analyzes the progress of the research and development of mine DC electrical method instruments and equipment. It enumerates several common types of mine DC electrical method instruments. It analyzes the key problems of mine DC electrical method in solving the engineering problems. ① The current mine DC electrical method advance detection technology has low positioning precision in the circled space of water-bearing/conducting anomalies. At the same time, there is the problem of insufficient effective detection distance. ② The construction space of mine DC electrical method is narrow, and the electrical response of multi-directional geological anomalies is superimposed in the limited testing space. It increases the difficulty of data processing and interpretation. ③ The mine DC electrical method is susceptible to interference from metal sources at the site when applied underground, especially by large metal parts such as roadheaders, hydraulic supports, anchor locks (nets) supports, rails, and conveying pipelines. The future development direction of the mine DC electrical method is prospected. ① It is suggested to construct a multi-source geoelectric field data response feature library. ② It is suggested to obtain interpretation of multi-source data fusion. ③ It is suggested to establish the intelligent monitoring system of mine DC electrical method.