Method for conducting magnetic resonance advanced detection through rotation of loop antenna

Abstract

The invention relates to a method for conducting magnetic resonance advanced detection through rotation of a loop antenna. According to the method for conducting magnetic resonance advanced detection through rotation of the loop antenna, the loop antenna is fixed to a rotary support, measurement based on vertical rotation and measurement based on horizontal rotation are adopted, in a tunnel or a mine, a water-contained body in front of a tunnel face, a water-contained body of a roof, a water-contained body of a base plate, a water-contained body of the left side wall and a water-contained body of the right side wall are detected, hydrological parameter inversion is conducted on an obtained magnetic resonance signal, and thus a two-dimensional water content sector diagram is obtained. According to the method for conducting magnetic resonance advanced detection through rotation of the loop antenna, a one-dimensional magnetic resonance detection method is expanded into a two-dimensional magnetic resonance imaging method; compared with one-dimensional detection according to which only whether a water-contained body exists right in front can be judged, the method has the advantages that the rotary loop antenna is used for multi-angle detection and two-dimensional imaging, and the specific positions, the scales and the water contents of the water-contained bodies can be accurately judged; in addition, the problem that the space which the water-contained body is from can not be determined due to totals-space radiation of the antenna is effectively solved. By the adoption of the method, magnetic resonance detection precision is improved, the spatial distribution of the water-contained bodies nearby the tunnel face can be reflected more accurately, and life and property losses caused by the geological disasters such as water inrush and water burst during tunnel or mine construction are reduced.

Description

technical field [0001] The invention belongs to the field of advanced detection in the field of geophysical exploration, in particular to a method for magnetic resonance advanced detection by using loop antenna rotation. Background technique [0002] Due to complex geological conditions, geological disasters such as water inrush and gushing occur frequently in underground excavation projects such as tunnels and mines, which have brought huge casualties and economic losses. The advanced detection of water-bearing bodies in front of tunnels and mine shafts has become an important research topic, which is of great significance for formulating water inrush prevention measures and evaluating construction safety. [0003] Magnetic Resonance Sounding (MRS for short) is a direct geophysical prospecting method. Compared with traditional geophysical indirect detection methods, MRS has the advantages of high resolution, high efficiency, rich information and unique interpretation, and ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for magnetic resonance advanced detection by rotating the loop antenna, which aims to use the rotating loop antenna for multi-angle detection and two-dimensional imaging, and can effectively determine the specific location of the water body. It also effectively solves the problem that it is impossible to distinguish which space the water body comes from due to the full-space radiation of the loop antenna

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