Mine coal rock power disaster multi-seismic-source real-time positioning method

Abstract

The invention discloses a method for real-time positioning of multi-seismic sources of coal-rock dynamic disasters in mines. The method adopts an orthogonal magnetic rod antenna to receive electromagnetic radiation signals released by the coal body rupture that is a precursor to coal-rock dynamic disasters, and according to the received electromagnetic radiation signal energy and the magnetic rod The square of the cosine of the angle between the antenna and the radiation direction of the seismic source is proportional to the energy ratio of the electromagnetic radiation signal in the horizontal direction and the vertical direction of the orthogonal magnetic rod antenna, and the radiation direction of the seismic source is determined. Using the electromagnetic radiation signals of multiple monitoring stations, the direction finding cross positioning is used. This method can realize the real-time monitoring and positioning of multi-seismic sources of coal rupture that is a precursor to coal rock dynamic disasters in front of the working face, which reduces the workload, improves work efficiency, and has a better positioning effect. It truly realizes non-contact prediction and provides a reference for formulating reasonable coal-rock dynamic disaster prevention and control measures.

Description

technical field [0001] The present invention relates to a method for real-time multi-source real-time positioning of coal-rock dynamic disasters in mines, more specifically, the realization of multi-source real-time positioning by using electromagnetic radiation signals released by coal-rock rupture, which is a precursor to coal-rock dynamic disasters, and is mainly used in coal-rock dynamic disasters. Disaster monitoring and early warning. Background technique [0002] In recent years, with the increasing depth and intensity of coal mining, coal-rock dynamic disasters have become more and more serious. Mine coal-rock dynamic disaster phenomenon is a phenomenon with dynamic effects and disaster consequences that occurs in a short period of time under the action of external stress on coal and rock mass, mainly including coal and gas outburst, rock burst (also known as rock burst, rockburst, etc.) or mine earthquake), roof collapse, etc. Due to the remarkable characteristics...

AI Technical Summary

Problems solved by technology

The index prediction method has the disadvantages of heavy workload, long operation time, affecting the production progress of coal mines, and low accuracy.

The construction of mine roadway will generate a lot of noise similar to the signal of coal and rock fracture, but the anti-interference ability of acoustic emission technology is poor, so it is difficult to accurately locate the source of coal and rock fracture

The attached gas in the coal seam is extremely unstable, and the gas content is uncertain. The gas emission dynamic prediction technology can only realize regional judgment, and the accuracy is poor

For the research on electromagnetic radiation positioning, the qualitative judgment of the dynamic disaster area (the fan-shaped area with an angle of 60° and a radius of 7m to 22m) has been realized, but the accurate judgment of the location of the coal and rock fracture source is still not complete; in view of the fast propagation speed of electromagnetic waves, However, the length of the coal mining face is relatively short, and the source energy of the electromagnetic radiation is unknown, so it is basically impossible to use the traditional distance and time difference positioning. Method", application number: 201310000729.4, application date: 2013.1.5, the method is to use electromagnetic radiation to locate the direction of the source, and then use acoustic emission to locate the distance of the source; patent "a coal-rock dynamic disaster electromagnetic radiation positioning method", application number: 201510473692.6, the application time was August 5, 2015. This method locates based on distance and time, but the velocity in the vacuum of electromagnetic waves is 3×10 to the 8th power, and the time difference of positioning according to distance and time is very small. This method is basically difficult to implement

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