Early warning method of mine ground pressure disaster

Abstract

The invention discloses an early warning method of a mine ground pressure disaster. The early warning method comprises the following steps: firstly, positioning seismic source position coordinates ofmicroseisms events occurring during deformation and failure of a rock mass in a mine by using a mine microseisms monitoring system; combining the seismic source position coordinates of all the microseisms events, then enabling every three points to form a plane from, and solving the distribution of the normal vector of each plane in the vertical projection orientation to obtain dominant orientation of the normal vector of a fracture plane; setting a plane vertical to the dominant orientation of the normal vector of the fracture plane as a dominant fracture plane, and statistically analyzing adistribution space of the dominant fracture plane area to obtain an early warning space; analyzing according to an accumulative apparent volume-energy index and a spatial-temporal b value variation rule of the dominant fracture plane area to obtain the early warning time and the risk grade of the ground pressure disaster; performing early warning on the time, the space and the grade of the groundpressure disaster according to the ground pressure risk grade. According to the early warning method, a plurality of indexes are used for performing early warning on the ground pressure disaster, so that early warning can be performed on the space, the time and the grade of the ground pressure disaster in time, and guidance is provided for disaster control.

Description

technical field [0001] The invention relates to the technical field of mine monitoring, in particular to an early warning method for mine ground pressure disasters. Background technique [0002] At present, roadways and goafs are formed during the mining process, which destroys the stress balance of the original rock in the mine area. Displacement and deformation occur, and even damage. During the mining process, the mining disturbance will change the stress distribution of the rock mass on a large scale, the rock mass in the stress concentration area will rupture, and the rock strata will release the rapid elastic energy instantaneously to form mine earthquakes (mine micro earthquakes), which will induce roof caving, mine pillar fracturing, Ground pressure disasters such as surrounding rock cracking, floor drums, and slabs. The microseismic monitoring technology can realize regional mining earthquake space-time positioning and rock mass stability assessment, and has becom...

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Problems solved by technology

[0012] However, in actual observations, there will be multiple cumulative apparent volume-energy index changes within a certain period of time, and it is impossible to determine which one is the closest "dangerous" moment, and the actual warning time is always too early or too late. situation, which directly affects the production efficiency of the mine

[0013] It can be seen that the single early warning indicator adopted by the above-mentioned prior art scheme is difficult to meet the guidance requirements of mine safety production, and the effective early warning method of multiple indicators has become a technical problem to be solved urgently in the current ground pressure monitoring

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