Method and system for positioning coal rock dynamic disaster through infrasonic wave monitoring

Abstract

The invention discloses a method and a system for positioning coal rock dynamic disaster through infrasonic wave monitoring. The system comprises a monitoring main station and a plurality of monitoring substations, and the monitoring substations are connected with the monitoring main station through a fiber optic network; each monitoring substation is composed of three infrasonic wave sensors arranged in a triangular form, and the infrasonic wave sensors are connected with an infrasonic wave monitor; and the monitoring main station is provided with a computing server. The positioning method isthat the main station computing server filters collected data, the time-frequency analysis is performed on the data by the short-time Fourier transform (STFT), the frequency energy density is compared, signals of the main frequency band are extracted, and the calculation result is positioned through statistical analysis and time delay estimation theory. The system monitors the infrasonic wave signal generated by the fracture of the loaded coal rock. Through this method, the non-contact and regional tests are carried out on the stress distribution state of the surrounding rock of the tunnel ormines to determine the area of coal rock fracture and stress anomaly. The method is simple in installation and operation, has little impact on production, and has a large detection range and a long detection distance.

Description

technical field [0001] The invention relates to the technical field of mine safety and stress monitoring and positioning, in particular to an infrasonic wave monitoring coal-rock dynamic disaster positioning method and a positioning system. Background technique [0002] The complex geological conditions of coal seams in my country and the complex stress distribution caused by human mining process also lead to coal and rock rupture, which may cause coal and rock dynamic disasters such as coal and gas outburst, rock burst, and roof fall. Therefore, the monitoring of coal and rock fracture is the key to solve the above problems. [0003] At present, most of the instruments suitable for mine stress monitoring are mainly contact type. Contact monitoring is to monitor the stress of multiple points of coal and rock through contact with coal and rock, and reflect the structure and stress distribution of coal and rock in the coal and rock area. The monitoring personnel are in an un...

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Problems solved by technology

The conclusions drawn by this method are relatively one-sided and less reliable.

[0006] Invention patent "a non-contact mine observation and evaluation method, application number 200710020549.7", through the test to receive the electromagnetic radiation intensity of the selected monitoring point, and calculate the average value E i , compared with the calculation of the electromagnetic radiation intensity Eavg of all measuring points, it can only evaluate high-stress areas, and cannot perform real-time monitoring

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