Method for exquisitely detecting slot wave earthquakes in stress concentration areas of working faces

Abstract

The invention discloses a method for exquisitely detecting slot wave earthquakes in stress concentration areas of working faces, belongs to the technical field of coal mine geological disaster prediction, and aims at solving the geological disaster prediction problems in high-stress areas of working faces in the prior art. The method comprises the steps of: drawing a stress-wave velocity change overall process curve through longitudinal wave and transverse wave velocity test under a coal and rock mass loading condition, and carrying out a linear formula and a nonlinear formula in stages; calculating crustal stress of a normal area of a working face according to geological data and well field crustal stress distribution features; predicting longitudinal wave and transverse wave velocities of coal and rock mass in the working area of the working face; establishing a three-layer symmetric medium model according to physical property parameters of the coal and rock mass on the working face,and analyzing slot wave theoretical frequency dispersion curve features through numerical calculation; and collecting field acquired transmission slot wave data, carrying out time frequency analysison the transmission slot wave data and drawing an actually measured time frequency curve. The method is capable of better predicting and forecasting coal mine geological disasters.

Description

technical field [0001] The invention belongs to the technical field of coal mine geological disaster prediction, and in particular relates to a new method for fine channel wave seismic detection in a stress concentration area of ​​a working face. Background technique [0002] With the massive mining of coal resources, shallow resources are gradually exhausted, and the mining depth of coal seams increases year by year, and the in-situ stress also increases. For mines with complex geological structures, due to the superposition of multi-stage tectonic movements, large tectonic stress will also be generated. High stress will have a great impact on the excavation and maintenance of the roadway, the excavation of the chamber and the recovery of the working face, and even hinder the normal production. At the same time, when encountering these high-stress areas during mine excavation, roadway deformation and roof collapse are very likely to occur, resulting in crushing accidents, ...

AI Technical Summary

Problems solved by technology

High stress will have a great impact on the excavation and maintenance of the roadway, the excavation of the chamber and the recovery of the working face, and even hinder the normal production

At the same time, when encountering these high-stress areas during mine excavation, roadway deformation and roof collapse are prone to occur, resulting in frame crush accidents, equipment damage, and even casualties, resulting in huge economic losses.

[0003] At present, there is no effective prediction method in the prior art for geological disasters in high-stress areas of working faces

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