A Method for Determining the Pressure Relief Range of Protective Seam Mining in Inclined Thick Coal Seam
A technology for protective layers and thick coal seams, applied in ground mining, earth square drilling, underground mining, etc., can solve the problems of verification, the inability to objectively obtain the pressure relief range of the protective layer, and the inability to realize the pressure relief effect, etc., to achieve layer relationship clear effect
Active Publication Date: 2022-06-21
CHINA UNIV OF MINING & TECH +2
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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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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] like figure 1 and figure 2 As shown, a method for determining the mining pressure relief range of a protective layer of a sloping thick coal seam includes the following steps:
[0022] 1) Collect the position, mining boundary, coal seam thickness, coal seam dip angle and coal seam spacing information of protective layer 1 and protected layer 2, wherein the protected layer 2 is located below the protective layer 1, and the protected layer 2 is parallel to the protective layer 1 ;
[0023] 2) According to the information collected in step 1), the maximum effective protection vertical distance of the coal seam is judged in combination with the dip angle of the coal seam, and the specific judgment process is as follows:
[0024] a. If the inclination angle of the coal seam between the protective layer 1 and the protected layer 2 is greater than 45 degrees, the m...
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A method for determining the mining pressure relief range of protective layers in inclined thick coal seams, by collecting information on the positions of protective layers and protected layers, mining boundaries, coal seam thickness, coal seam dip angles, and coal seam spacing, combined with coal seam dip angles to determine the maximum effective protection of coal seams Vertical distance, if the protected layer is within the maximum effective protection vertical distance range, calculate the theoretical relative pressure relief height difference between the roof lane and the bottom roadway of the protected layer, and arrange the roof of the protected layer and the protective layer within the theoretical relative pressure relief height difference Roadway and floor roadway, a plurality of pressure sensors are respectively arranged in the range of the roof roadway and floor roadway of the protective layer and the protected layer, and the maximum stress of each roadway pressure recorded by the sensors is respectively averaged to determine each According to the peak value of the average stress of the lane, verify whether the protected layer has achieved the pressure relief effect. The invention realizes the clear description of the layer relationship between the protected layer and the protective layer, and the determination of the pressure relief range of the mine protective layer and the verification of the actual pressure relief effect.
Description
technical field [0001] The invention relates to a method for determining the mining pressure relief range of a protective layer of inclined thick coal seam, and belongs to the technical field of coal mining. Background technique [0002] The protective layer is the coal seam that is mined first in order to eliminate or weaken the danger of rock burst in adjacent coal seams. The mining of the protective layer can relieve the stress of the coal seam rock mass adjacent to the protected layer to a certain extent, which is of great significance for preventing coal mine rock burst disasters. . [0003] After the protective layer is mined 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 and rock, and the pressure relief effect will appear in the upper and lower rock layers in the goaf, making the stress state of the rock mass in the rock layer. The stress and displacement state have changed to ...
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IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 何江吴江湖杨文连葛庆邵嗣华袁弘誉苗伟东牛勤平
Owner CHINA UNIV OF MINING & TECH