Fine analysis on advanced detection of transient electromagnetic method

Fault fracture zones and water-bearing bodies in front of the driving head are the main disasters in mine laneways, thus it is important to perform their advanced detection and prediction in advance in order to provide reliable technical support for the excavation. Based on the electromagnetic induction theory, we analyzed the characteristics of primary and secondary fields with a positive and negative wave form of current, proposed the fine processing of the advanced detection with variation rate of apparent resistivity and introduced in detail the computational formulae and procedures. The result of physical simulation experiments illustrate that the tectonic interface of modules can be judged by first-order rate of apparent resistivity with a boundary error of 5%, and the position of water body determined by the fine analysis method agrees well with the result of borehole drilling. This shows that in terms of distinguishing structure and aqueous anomalies, the first-order rate of apparent resistivity is more sensitive than the second-order rate of apparent resistivity. However, some remaining problems are suggested for future solutions.