Device and method for advanced detection of single-hole electromagnetic wave tomography

Abstract

The invention designs a single-hole electromagnetic wave tomography advanced detection device and method. A probe is disposed in a borehole. A field main unit controls the probe to transmit, receive, acquire, and transfer signals. Geological formation conditions of different-radius rock formations around the borehole where the probe locates are detected by transmitting and receiving a group of electromagnetic waves different in frequency; apparent resistivities of the different-radius formations around the borehole where the probe locates are calculated by the field main unit; the probe is advanced by a push bar; the steps above are repeatedly performed on each measuring spot, so that the apparent resistivities of the different-radius formations around the borehole at the different-depth measuring spots in the bore can be detected, a map of apparent resistivities of the different-radius formations around the whole borehole is generated, geographical features of the cylindrical space centering on the axis of the borehole can be judged according to the map of apparent resistivities, and analysis and judgment for whether or not the formations are water-logged stratums or contain water-logged geological structures and the like can be made.

Description

technical field [0001] The invention relates to the technical field of applied geophysics electromagnetic detection, in particular to a single hole electromagnetic wave tomography advanced detection device and method. technical background [0002] Advanced detection is mainly to detect whether there are harmful geological structures or water-rich bodies and water-guiding channels in front of the excavation roadway by direct or indirect methods to the direction of tunnel and roadway excavation, and provide detailed detection data for safe excavation of tunnels. [0003] At present, the direct method used for advanced detection of coal mines is the drilling method, and the indirect method is the geophysical method. Although the drilling results of the drilling method are relatively reliable, the construction period is long and the cost is high, which has a great impact on the normal production of tunnels and roadways. [0004] At present, there are mainly four kinds of geophys...

AI Technical Summary

Problems solved by technology

Among them, the seismic wave method mainly solves the problem of the geological structure interface, and cannot explain the water-rich nature of the structure; mine geological radar is currently in the research and trial stage, and its detection depth is relatively small

[0005] The above geophysical methods are all advanced detection methods for tunnels, roadways or working faces. Various metal facilities such as protection and transport belt brackets have a great influence on the observation results. At the same time, the site construction design, data observation and result analysis are more complicated, and the detection parameters are single. Only one parameter of resistivity is used, and the ability to eliminate multiple solutions is poor. , the result is multi-solution

If the above-mentioned multiple methods are used in combination, the forecast cost of the advanced forecast will be greatly increased.

Images