Coal rock mass instability failure precursor information identification method

Abstract

The invention discloses a coal and rock mass instability failure precursor information identification method, which comprises the following steps: carrying out real-time acoustic emission monitoring on a loaded coal and rock mass, obtaining space coordinates and earthquake time of acoustic emission events corresponding to the loaded coal and rock mass, and obtaining an acoustic emission event sequence; establishing a single-bond group architecture of an acoustic emission event sequence; calculating the unit vector of each single bond, translating the starting point of each unit vector to the center of the unit sphere, and converting the direction characteristics of each single bond into discrete points on the spherical surface of the unit sphere for representation; a spherical crown surface covering method is adopted to obtain distribution characteristics of discrete points on the spherical surface, and fractal dimensions of single-key direction distribution characteristics are obtained; by analyzing the change rule of the fractal dimension of the single-bond direction distribution characteristics, coal and rock mass instability failure precursor information is obtained, and coal and rock mass instability failure early warning is achieved. The coal and rock mass instability failure precursor information identification method is convenient to solve and reliable in result.

Description

technical field [0001] The invention relates to the technical field of coal safety engineering, in particular to a method for identifying precursor information of coal rock mass instability and destruction. Background technique [0002] Coal as a basic energy source. With the continuous increase of mining depth, deep coal and rock masses are often in a multi-phase multi-field coupling environment with high geostress, high gas pressure, and high geothermal temperature, and the physical and mechanical properties, basic mechanical behavior characteristics and engineering responses of coal and rock masses have changed Fundamental changes, coupled with stress disturbances caused by roof fractures, fault slips, mining, blasting, etc., have led to a sharp increase in the risk of coal-rock dynamic disasters, the mechanism of disaster formation has become more complex, and the difficulty of prevention and control has increased significantly, seriously threatening the safety of underg...

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Problems solved by technology

[0004] The present invention provides a coal rock mass instability failure precursor information identification method to solve the problem that most of the existing technologies only focus on individual acoustic emission events, and there are few studies on the correlation characteristics of acoustic emission events, and no effective method has been formed yet. Technical problems of accurate identification method of coal and rock mass precursor information

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