Ground-roadway advanced detection method based on nuclear magnetic resonance technology

Abstract

The invention discloses a ground-roadway advanced detection method based on a nuclear magnetic resonance technology. The ground-roadway advanced detection method comprises the steps of: laying a transmitting coil on the ground of a region to be detected; synchronizing the transmitting device with receiving probes by using a quartz clock; supplying an alternating current with the frequency being Larmor frequency to the transmitting coil, so that a corresponding magnetic field is induced in the underground, and the receiving probes arranged in an underground roadway receive signals of the magnetic field; repeating the above steps, arranging the receiving probes along the roadway at the same distance, carrying out detection again by means of all the receiving probes every time a receiving probe is additionally arranged, and alarming immediately and stopping advancing if an abnormal signal occurs, until the excavation is completed; transmitting data detected by means of the receiving probes to a ground general console via a downhole data acquisition station for summarizing and data processing; and judging a water inrush range in front of the excavation by combining with hydrogeologicaldata. The ground-roadway advanced detection method increases the detection depth of nuclear magnetic resonance and the precision of a delineated water-containing region, has high exploration precision, can be effectively applied to the roadway excavation directly, and performs dynamic monitoring.

Description

technical field [0001] The invention relates to a detection method, in particular to a ground-roadway advanced detection method based on nuclear magnetic resonance technology. Background technique [0002] Coal mine water damage is one of the main safety disasters in the process of mine construction and production alongside gas and roof. Among major accidents in my country's coal mining areas, coal mine water disaster accidents rank second only to gas accidents in terms of death toll, and rank third in terms of occurrence times, second only to coal mine gas and roof accidents. The state attaches great importance to the prevention and control of coal mine water disasters. At present, mine water inrush prevention and control technology has been included in the national science and technology support plan and key scientific and technological research projects to guide coal mine safety production. [0003] It has become an urgent need for coal mines to detect and find out the h...

AI Technical Summary

Problems solved by technology

However, the existing ground nuclear magnetic resonance technology requires a high sensitivity of the instrument because the received water nuclear magnetic resonance signal is weak, so the instrument has a low anti-electromagnetic interference ability, and the exploration depth is small and there are exploration blind spots, so it cannot be fed back to the roadway in time Water content information in front of the excavation; the water-bearing structure of the roof mainly detected by the general well NMR technology cannot directly serve the excavation work of the roadway, and cannot perform dynamic monitoring

[0007] It can be seen that the general surface nuclear magnetic resonance method for finding water and the common ground well nuclear magnetic resonance method have shallow exploration depth and low precision, and cannot effectively directly serve roadway excavation and carry out dynamic monitoring

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