Research on the Manifestation Law of Mining Pressure in High Angle and Close Range Coal Seam Mining
In order to achieve efficient and safe mining of coal seams with high dip angles and close distances,numerical simulation combined with engineering practice was used to study the mining pressure manifestation of the roof rock layer in the working face.Firstly,the vertical stress under different working face advancement distances was analyzed.It was found that during the mining of coal seams with high dip angles and close distances,the stress on the bottom plate was released due to the mining of the upper coal seam,resulting in a smaller stress in the middle and lower parts of the lower coal seam,a reduced stress concentration coefficient,and a larger stress value in the upper part of the roof.By comparing the stress under different mining schemes,it was found that the lower coal seam of the steep and close range coal seam was disturbed by the upper coal seam mining,and there was a significant phenomenon of pressure relief disturbance.At the same time,by analyzing the resistance of the working face support in different areas,it was found that the pressure in the central area was 5～15 meters ahead of the upper and lower areas,and the working pressure showed a characteristic of"first in the middle,then up and then down",providing reference for the mining of large angle and close distance coal seams.
numerical simulationmineral pressure manifestationclose range coal seamssupport resistance
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