Underground water detection device and detection method based on combination of nuclear magnetic resonance and transient electromagnetic method

Abstract

The invention relates to underground water detection device and detection method based on the combination of nuclear magnetic resonance and transient electromagnetic method. The underground water detection device is formed by connecting a computer with a transient electromagnetic emission bridge circuit and a nuclear magnetic resonance emission bridge circuit through a high-power power supply with an adjustable output voltage, connecting the nuclear magnetic resonance emission bridge circuit with an emission coil through a harmonic capacitor, connecting the computer with the nuclear magnetic resonance emission bridge circuit and the transient electromagnetic emission bridge circuit through an emission control unit respectively, and connecting the emission control unit with the nuclear magnetic resonance emission bridge circuit and the transient electromagnetic emission bridge circuit respectively. The underground water detection device has the prominent advantages that the limit of a test site is avoided by using a hollow coil, thus increasing the transverse resolution of nuclear magnetic resonance detection. The underground water detection device can be much conveniently applied in underground engineering for narrow spaces such as tunnels and mine excavation roadways, the dimensions of a reception device are greatly reduced, and the spatial constraint is lower, thus the underground water detection device can be used for much accurately detecting a water-containing body; the problems of time consumption, cost consumption and labour consumption during pavement for a large coil are solved, the working efficiency is increased, and the working cost is reduced.

Description

technical field [0001] The invention relates to a geophysical exploration equipment and method, in particular to a groundwater detection device and detection method based on an air-core coil combined nuclear magnetic resonance and transient electromagnetic (MRS-TEM). Background technique [0002] MRS-TEM is an instrument that combines the two methods of nuclear magnetic resonance and transient electromagnetic technology. The functions of the two devices are realized by a set of instruments, the respective advantages of the two instruments are brought into play, the investment in the devices is reduced, and the advantages of the signal-to-noise ratio of the instruments are improved. In underground construction, especially in tunnels, mines and other narrow hollows, due to complex geological conditions, geological disasters of water inrush and mud inrush caused by groundwater occur from time to time, which brings huge disasters and risks to construction safety. Incalculable e...

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Problems solved by technology

[0006] The water finding devices of the above-mentioned inventions all have higher measurement accuracy and higher reliability, but all have some shortcomings. When measuring a point, it can only be obtained whether there is water in a large range (for example, a large coil area of ​​100m*100m1 10,000 square meters), resulting in low lateral resolution of the measurement, and it is difficult to accurately locate the water body; and due to the large size of the coil, it is impossible to lay large coils on site in narrow spaces such as mines and tunnels, and the adaptability to the working environment is poor

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