Geological radar chromatographic detection method for disaster source in mine recovery area

Abstract

The invention relates to a geological radar chromatographic detection method for a disaster source in a mine recovery area, belonging to the technical field of geophysical exploration. The method comprises the steps of determining positions of transmitting points and receiving points; conducting geological radar chromatographic detection on a selected detection profile; conducting mesh generation on the profile; constructing an inversion equation set of wave velocity chromatography; determining the wave velocity distribution of the detection profile; and drawing a contour map of detection profile wave velocity distribution and recognizing the spatial position and the characteristic attribute of the disaster source. The geological radar chromatographic detection method for the disaster source in the mine recovery area realizes the quick, accurate, nondestructive detection on disaster source information in modernized mine recovery areas and plays a role in guiding underground safe mining.

Description

technical field [0001] The invention relates to the technical field of geophysical detection, in particular to a detection method for a disaster source in a mining area of ​​a mine. Background technique [0002] As the depth of coal mining increases, the geological conditions of mines become more and more complex. Water and gas are the main media that endanger the safe production of coal mines. Before the installation or mining of fully mechanized mining equipment, detecting the spatial location and characteristic attributes of the disaster source in the mining area is the key task to ensure the continuous mining of the working face. The vertical distance between roadways in modern coal mining areas is often greater than 200 meters, and some mining areas even exceed 400 meters, and the range of disaster sources and unfavorable geological bodies in mining areas is usually small, requiring high detection accuracy and strong recognition ability. However, there is currently no...

AI Technical Summary

Problems solved by technology

The drilling method is accurate, but the speed is slow and the cost is high. It is difficult to delineate the range of water-rich areas, and there are dangers in drilling. The direct current method is based on the difference in conductivity between coal and rock formations. The distribution law of the earth current field can be used to determine the distribution law of the physical properties of rocks and ore bodies or the characteristics of the geological structure. However, underground exploration belongs to the full space category, with large volume effects and a small detection effective range. Powerless, which makes it difficult to meet the needs of the mine; the mine transient electromagnetic method passes a step current into the transmitting coil, uses the receiving coil to measure the induced secondary field, and determines the detection according to the change characteristics of the induced electromotive force of the received secondary field with time. The change law of the electromagnetic properties of the medium within the scope, the geological conditions in the detection direction can be obtained through further data interpretation and processing, but the effective distance of detection is about 100 meters; GPR is a fast, non-destructive and accurate geophysical detection technology. The widely used reflection wave detection method is based on the difference in the dielectric constant of the underground medium, and uses the reflection of the high-frequency electromagnetic pulse wave to detect the target object and geological phenomena. , but the detection distance is generally limited to about 30 meters

[0004] From the above analysis, it can be seen that none of the current geophysical prospecting methods can be used to detect the disaster source in the modern coal mining area.

Images