Water inrush detection method in front of roadway with double d-coil nuclear magnetic resonance instrument
A nuclear magnetic resonance and detection method technology, applied in the field of advanced detection, can solve the problems of wasting manpower and resources, complex system devices, low work efficiency, etc., and achieve the effects of suppressing noise, improving signal-to-noise ratio, and reducing life danger and property loss.
Inactive Publication Date: 2015-08-05
JILIN UNIV
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Problems solved by technology
It is a destructive detection method with low work efficiency and certain dangers
However, the advanced detection nuclear magnetic resonance device has a complex system and is seriously disturbed by underground power frequency. When the advanced detection nuclear magnetic resonance device is working, the roadheader needs to stop working and needs to be excited layer by layer, which takes a long time and reduces the working efficiency. Low, waste of manpower and resources
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Embodiment 1
[0048] In a field test in a mining area in Northeast China, before measurement, according to the development and utilization plan of the mining area, combined with the local geological conditions, mining methods and the size of the underground roadway to determine the diameter of the double D-shaped coil for follow-up detection, different coil diameters Affected detection depth, adopt 200 turns, 2m diameter double D type coils in this test; According to the technical index of nuclear magnetic resonance detector, determine emission current I 0 =50A, launch time τ=40ms, through q=I 0 τ is calculated to get the emission pulse distance q=2A·S; when the water content n(r) of the rock formation reaches 35%, it is used as a reference value for judging that there may be water inrush. Danger.
[0049] Expression via NMR signal:
[0050]
[0051] where, q=I 0 τ is the pulse moment, the current intensity I 0 The product of the duration τ; x is the advanced detection distance; ω L...
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The invention relates to a method for sounding water burst in front of a roadway of a dual-D type coil nuclear magnetic resonance spectrometer by following a heading machine. The method comprises the steps of: fixing the dual-D type coil nuclear magnetic resonance spectrometer on an operating platform of a heading machine; with the water content 35 percent in a rock stratum as a water burst parameter, forwards molding to obtain a nuclear magnetic resonance signal, comparing the nuclear magnetic resonance signal with a calibrating signal, if the nuclear magnetic resonance signal is less than the calibrating signal, indicating that no dangers exists; and if the nuclear magnetic resonance signal is more than the calibrating signal, indicating that dangers exist, sending an alarm by a nuclear magnetic resonance spectrometer, and stopping heading. Due to the adoption of dual D type coils, when data is processed, working out the difference between the left coil and the right coil acquire signal, sounding capacity and signal to noise ratio are increased, noise is effectively inhibited, fixed-distance water burst sounding is realized, heading does not need to be stopped, continuous heading is realized, and sounding efficiency and heading efficiency are increased. Whether dangerous prewarning exists in front of heading can be accurately and directly reported in real time, and life risk and property loss brought to miners by water burst are reduced.
Description
technical field [0001] The invention relates to an advanced detection method for geophysical exploration in the field of water conservancy and hydropower engineering and mining, in particular to a method for detecting water inrush ahead of the tunneling in a roadway based on a double D-shaped coil nuclear magnetic resonance instrument. Background technique [0002] Magnetic Resonance Sounding (MRS for short) is a direct and non-destructive geophysical exploration method. [0003] In 2006, Jilin University Jiang Yanqiu's master's degree thesis "Development of the Transmitter of the Ground Nuclear Magnetic Resonance Water Finder" introduced the circuit design of each part of the transmitter of the Ground Nuclear Magnetic Resonance Water Finder. In 2008, Gao Dongxu's master's degree thesis "Nuclear Magnetic Resonance Water Finder Weak Signal Amplifier Design" introduced the design of the ground nuclear magnetic resonance water finder signal conditioning circuit. In 2009, Jiang...
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IPC IPC(8): G01V3/32
Inventor 段清明万琦蒋川东
Owner JILIN UNIV