A coal mine rock burst early warning method, system and components thereof

Abstract

The invention discloses an impact ground pressure pre-warning method for a coal mine. The method comprises the following steps: carrying out a stress relief test on a rock core by using a fiber bragggrating three-dimensional stress sensor and acquiring elasticity modulus and poisson ratio of a rock after the stress relief test; calculating stress of primary rock of a top rock by means of the elasticity modulus and poisson ratio; monitoring disturbance stress of the top rack online by using the fiber bragg grating three-dimensional stress sensor; superposing the stress of primary rock and thedisturbance stress to obtain true stress of the top rack; and comparing the true stress with triaxial strength of the rock and carrying out staged pre-warning by means of the comparison result. The method can monitor the true stress of the top rack online, and also can pre-warn based on monitored data, so that the safety of underground operation staff and apparatuses can be guaranteed. The invention also discloses an impact ground pressure pre-warning device, an impact ground pressure pre-warning device and impact ground pressure pre-warning equipment for the coal mine and a readable storage medium with corresponding technical effects.

Description

technical field [0001] The invention relates to the technical field of rock burst monitoring, in particular to a coal mine rock burst early warning method, device, system, equipment and a readable storage medium. Background technique [0002] Rockburst disasters seriously threaten underground safety production. In underground coal mines, according to the theory of rock burst strength, the occurrence of rock burst is the result of the internal stress concentration of the rock and coal mass. pressure disaster. However, because the coal body is relatively soft and broken, it is not yet possible to directly measure the three-dimensional stress in the coal body. Therefore, accurate monitoring of the three-dimensional stress of the roof strata in the working face is an effective way to predict rock burst. [0003] At present, the monitoring and early warning methods of rock burst mainly include microseismic method, electromagnetic radiation method, coal seam stress method, dril...

AI Technical Summary

Problems solved by technology

However, the existing methods are unable to monitor the three-dimensional stress of the working face roof for a long time. The reasons include: on the one hand, the existing stress sensor uses resin as the main structural material, and the resin has strong rheology under long-term stress; On the one hand, due to the existence of many large-scale equipment in the coal mine working face, the working face is subject to strong electromagnetic interference

Ultimately, the existing stress monitoring equipment and methods cannot realize the long-term and accurate monitoring of the three-dimensional stress of the roof rock formation.

[0005] The underground environment is more complicated than that on the ground. Once a rock burst disaster occurs, it will often result in the death of personnel who cannot be treated in time, and will also cause a large loss of equipment.

Images