A kind of acoustic emission monitoring unit for dynamic display experiment of true triaxial mining coal and rock mass

Abstract

The invention discloses an acoustic emission monitoring unit for a true three-axis coal and rock mass mining power display experiment. The acoustic emission monitoring unit comprises roof and bottom plate fixtures, lateral non-unloading surface fixtures, a lateral unloading surface fixture and acoustic emission probe assemblies, wherein the two roof and bottom plate fixtures are available and separately comprise the acoustic emission probe assembly, and the acoustic emission probe assemblies are respectively positioned in the centers of the roof and bottom plate fixtures; the three lateral non-unloading surface fixtures are available and separately comprise the two acoustic emission probe assemblies which are distributed at the diagonal positions. The monitoring unit not only can be directly contacted with the coal and rock mass for realizing accurate monitoring, but also can realize the functions of triaxial loading, pressure holding and single-sided unloading; furthermore, the monitoring unit can accurately detect the micro-fracture events and clear waveforms of the coal and rock mass during when the coal and rock mass is loaded.

Description

technical field [0001] The invention relates to a monitoring unit, in particular to an acoustic emission monitoring unit for a real three-axis mining coal rock mass dynamic display experiment. Background technique [0002] With the rapid development of the global economy, the demand for various mineral resources in all countries in the world is increasing day by day. The mineral resources buried in the shallow layer can no longer meet the needs of human beings. The mining activities of various countries continue to extend to the deep strata. Although humans have made a series of complete research results on shallow underground engineering, the deformation and failure mechanism of deep rock mass is very different from that of shallow rock mass under the action of high ground stress. The detection found that the failure of the surrounding rock in the deep roadway will cause the phenomenon of zonal cracking in which the cracked zone and the non-cracked zone alternately appear. ...

AI Technical Summary

Problems solved by technology

[0005] At present, most of the existing true triaxial experiments can only be detected by installing ultrasonic and acoustic emission monitoring equipment outside the oil cylinder and fixture, and cannot directly contact the coal and rock mass for accurate monitoring, which will cause large monitoring errors. It is also difficult to locate the internal crack position

[0006] Although some patents have designed a true three-axis physical-mechanical imaging unit that can achieve accurate positioning of micro-cracks, it is still unable to realize experiments on complex stress paths such as single-sided unloading and dynamic load impact.

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