A method for monitoring the pressure and breakage of the roof of the working face

Abstract

The invention discloses a working face roof weighing and fracture monitoring method.The method comprises the steps of selecting the position of the bottom of a drill hole; symmetrically-distributed perpendicular drill holes are punched in the two-lane roof of the working face to the selected position of the bottom of the drill hole; a vibration acceleration sensor is installed at the bottom of each drill hole, at the moment, the two symmetric drill holes form a monitoring line to be used for monitoring the working face basic roof weighing situation within one weighing step distance; the distance of the monitoring line is selected as the basic roof weighing step distance; a vibration signal collection and analysis system is selected, and an average value of data obtained by two vibration acceleration sensors of the same monitoring line; according to the working face roof weighing situation, the working face support condition is adjusted in time.According to the method, the working face roof weighing can be monitored and fed back in time, coal mine roof safety accidents caused by the working face roof weighing are effectively reduced, and life and property damage of mine and workers are lowered.

Description

technical field [0001] The invention relates to the technical field of coal mine working face monitoring, in particular to a method for monitoring the pressure and breakage of the roof of the working face. Background technique [0002] The pressure and breakage of the roof of the working face is a phenomenon of severe mine pressure in the process of coal mining, and the monitoring of the roof pressure of the working face is of great significance to the safe production of mines. [0003] Under the current mechanized mining conditions, hydraulic supports have been widely used, and the pressure from the roof of the working face has little harm to coal mine production. Forecasting and forecasting of pressure, calculation and control of strata movement play an important role; for special mines with complex geological conditions, the monitoring of pressure and fracture of the roof of the working face still needs to be paid enough attention to. These special mines include coal and ...

AI Technical Summary

Problems solved by technology

[0004] 1. Manual observation and measurement method, which judges the pressure force of the roof of the working face according to the condition of the coal wall of the working face and the sound frequency of the roof fracture. This method qualitatively judges the pressure behavior of the roof due to the influence of subjective and objective factors , the monitoring accuracy is poor, and it often brings large errors due to human factors

[0005] 2. The working resistance monitoring method of the hydraulic support monitors the pressure of the roof of the working face by monitoring the change of the working resistance of the hydraulic support, and determines the step distance of the pressure based on this. This method measures the average working resistance of the hydraulic support during the pressing period. value divided by the average value of the support working resistance during the non-compression period to determine the pressure intensity. Obviously, the support working resistance monitored by this method cannot directly reflect the pressure situation of the old roof. Therefore, the pressure intensity determined by this There is also a large error in the pressure step distance

[0006] To sum up, at present, there is no monitoring method in the prior art that can timely and accurately monitor the pressure from the roof of the working face

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