Method used for determining mining pressure relief range of protective layer of inclined thick coal seam

Abstract

The invention discloses a method for determining the mining pressure relief range of a protective layer of an inclined thick coal seam. The position, mining boundary, coal seam thickness, coal seam inclination angle and coal seam spacing information of the protective layer and a protected layer are collected, the maximum effective protection vertical distance of the coal seam is judged by combining the coal seam inclination angle, if the protected layer is within the range of the maximum effective protection vertical distance, theoretical relative pressure relief height differences of a roof roadway and a floor roadway of the protected layer is calculated, the roof roadway and the floor roadway of the protected layer and the roof roadway and the floor roadway of the protective layer are arranged in the theoretical relative pressure relief height differences, a plurality of pressure sensors are respectively arranged in the ranges of the roof roadway and the floor roadway of the protected layer and in the protective layer, averaging is respectively carried out on the maximum stresses of each roadway pressure of the protected layer and the protective layer recorded by the sensors to determine the average stress peak value of each roadway, and whether the protected layer achieves the pressure relief effect or not is verified according to the average stress peak value. According to the method, the clear description of the horizon relationship between the protected layer and the protective layer is realized, the pressure relief range of the mine protective layer is determined, and the actual pressure relief effect is verified.

Description

technical field [0001] The invention relates to a method for determining the range of pressure relief in the mining of inclined thick coal seam protective layers, belonging to the technical field of coal mining. Background technique [0002] The protective layer is the coal seam that is mined first to eliminate or weaken the risk of rock burst in the adjacent coal seam. Mining the protective layer can unload the stress of the coal seam rock mass adjacent to the protected layer to a certain extent, which is of great significance to prevent coal mine rock burst disasters . [0003] After the mining of the protective layer in the coal mine, the collapse of the roof rock mass in the goaf will cause the stratum stress to transfer to the surrounding solid coal rock, and there will be a pressure relief effect in the upper and lower rock layers of the goaf, so that the stress state of the rock mass in the rock layer will be reduced. The state of displacement and displacement change...

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Problems solved by technology

[0004] For the inclined thick coal seam, because the coal seam of the protected seam is thicker, the existing judgment method of the mining pressure relief range of the protective seam cannot accurately determine the relative pressure relief height difference between the protected seam and the protective seam, and cannot objectively obtain the relief pressure of the protective seam. pressure range, unable to verify the actual pressure relief effect

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