Magnetoelectric comprehensive detecting instrument underground coal mine and magnetoelectric comprehensive detection method

Abstract

The invention relates to a magnetoelectric comprehensive detecting instrument underground a coal mine and a magnetoelectric comprehensive detection method. The magnetoelectric comprehensive detecting instrument underground the coal mine comprises a transmitter and a receiver, and is characterized in that the transmitter comprises a transmitting power supply, a transmitting control circuit, a transmitting coil and electrodes; and the receiver comprises a receiving coil, electrodes, a received signal regulating circuit, an analog to digital converter (ADC), a receiving power supply and a data processing platform. The magnetoelectric comprehensive detecting instrument underground the coal mine is particularly suitable for detecting a goaf underground the coal mine, a lava development area, a fault, water fill of a crushed zone and other geological hazards; actual resistance rate detected through a symmetrical quadrupole device of a direct current method is used to rectify apparent resistivity of a geologic body, and the precision of a transient electromagnetic method is improved; and direct current method data are used to fill a shallow layer blind area of the transient electromagnetic method, and no blind spots exist in the full blind area.

Description

technical field [0001] The invention relates to a mine geophysical prospecting equipment, in particular to a coal mine underground magnetoelectric comprehensive detector. Background technique [0002] The electrical method is divided into two categories: the alternating current method and the direct current method. The electrical detection method is based on the difference in conductivity of the rock (ore) in the geological body, and the distribution characteristics and characteristics of the artificially established underground current or electric field are established through observation and research. It is a kind of exploration geophysical method to find out the underground geological structure and find underground electrical anomalies, so as to achieve ore prospecting and solve other geological problems (landslides, karst and goafs, etc.). It has the advantages of high efficiency, reflecting geoelectricity and rich geological information; the most common alternating curr...

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Problems solved by technology

The main disadvantages are:

[0005]2. The resistivity range of the coal seam is large, generally between 800-3000 (Ω / M). The apparent resistivity inversion commonly used by the transient electromagnetic method will have Larger errors must be corrected using empirical coefficients

[0006]The direct current method is the most common high-density electric method; The device measures the distribution of the surface electric field to invert the existence and distribution of underground anomalies; the advantage of the direct current method is that the abnormal amplitude of geological bodies is strong, and the reflected geoelectric and geological information is reliable and rich; the main disadvantage is that the detection depth is shallow, especially when encountering When the shallow layer is high-resistance, the current penetration ability is poor, and the detection depth of the direct current method in the general coal mine is within 50 meters

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