Coal mine underground roadway transient electromagnetic stack advanced detection device and method

Abstract

The present invention belongs to the coal mining geophysical prospecting technical field, relates to a transient electromagnetic stack advanced detection device and method, in particular, a coal mine underground roadway transient electromagnetic stack advanced detection device and method. According to the device and method of the invention, a probe is arranged in a borehole, so that the probe can be far away from interference sources such as metal machineries in a roadway, and therefore, the influence of the interference sources can be avoided; the hole drilling conditions of a coal mine tunneling face are fully utilized, so that inside-roadway coil emission and inside-borehole three-component receiving can be realized; and a receiving device can move towards a direction before the tunneling face, and therefore, various kinds of the interference of the metal machineries at the tunneling face can be avoided without affecting the tunneling work of a mine party, and the advanced detection data of a plurality of positions in the borehole can be subjected to stack processing, and processing results can be displayed, and thus, hidden water damage geological bodies before the tunneling face can be predicted at an extra long distance.

Description

technical field [0001] The invention relates to a transient electromagnetic advanced detection device and method, which belong to the field of coal mining, and in particular to a transient electromagnetic superimposed advanced detection device and method for underground tunnels in coal mines. Background technique [0002] At present, with the continuous increase of coal mine mining depth, the advanced detection of water-bearing structures is of great significance to the safe production of coal mines. The mine transient electromagnetic advanced detection method has become one of the most commonly used underground water detection methods. The transient electromagnetic method is to send a pulsed or square wave primary electromagnetic field underground by using an ungrounded return line or a grounded electrode, and observe the secondary electromagnetic field generated by the underground eddy current induced by the pulsed electromagnetic field with a coil or grounded electrode. T...

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Problems solved by technology

[0003] Due to the presence of roadheaders, drilling rigs and other metal machinery at a short distance behind when coal mine excavation works, it will bring great influence on the metal body and electromagnetic interference to the transient electromagnetic detection. On the other hand, the original mine transient electromagnetic advanced detection technology has a limited detection depth, which does not meet the needs of rapid excavation that is currently developing.

And now the receiving device used in conventional mine transient electromagnetic advanced detection is an overlapping loop device, and the receiving device uses a coil (generally 2m×2m) with the same specification as the transmitting wire frame, which is impossible to plug into the borehole (advanced drilling The diameter of the hole is generally not greater than 73.5mm), and only the vertical component signal can be measured

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