Transient electromagnetic simulated earthquake detection method used for coal mine underground

Abstract

The invention relates to a detection method which is mainly used for coal mine underground detection, in particular to a transient electromagnetic simulated earthquake detection method used for coal mine underground. According to the method, measured data are added for each detection grid, influences caused by environmental factors in a roadway are substantially weakened, the density of detection data passing abnormal bodies is enhanced, and transient field data are converted into virtual wave field data, so that the influence caused by the volume effect of the electromagnetic method is weakened; meanwhile, the advanced fine processing technology of earthquakes is adopted for the method, fine explanation of geological anomalies is facilitated, and the detection accuracy for potential mine water disaster hazards can be remarkably improved.

Description

technical field [0001] The invention relates to a detection method, which is mainly used for underground coal mine detection, in particular to a transient electromagnetic quasi-seismic detection method for underground coal mines. Background technique [0002] The transient electromagnetic method is to use an ungrounded return line or a grounded line source to emit a pulsed magnetic field underground, and use a coil or a grounding electrode to observe the secondary eddy current field during the gap between the primary pulsed magnetic field. [0003] The small wire frame transient electromagnetic method is an electromagnetic prospecting method that has been widely used in the fields of coal mine advanced prospecting, roof and floor water damage detection, side walls and internal water damage detection of working faces in recent years. But at present, there are following problems in this method in the prior art: [0004] 1. The excitation energy of the wire frame is limited: d...

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Problems solved by technology

[0007] The present invention mainly solves the problems existing in the prior art, such as limited excitation energy of the emission line frame, unstable operation of equipment, and low detection accuracy of hidden dangers, etc., and proposes a transient electromagnetic quasi-seismic detection method for underground coal mines. Each detection grid increases the measurement data, which greatly reduces the influence of environmental factors in the roadway, improves the detection data density of abnormal objects, and converts the transient field data into virtual wave field data, weakening the electromagnetic method. At the same time, this method adopts the frontier fine processing technology of seismic, which is beneficial to the fine interpretation of geological anomalies, and can significantly improve the detection accuracy of mine water damage hidden dangers

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