Research on the Manifestation Law of Mining Pressure in Coal Seam Mining Face Under Coal Seam Group
To study the mining pressure law of coal seam working face under coal seam group,the 221001 working face of Shicao village coal mine was taken as the research object,and simulation and on-site monitoring methods were used to analyze the pressure characteristics of the coal seam working face.Research has shown that:1.The initial pressure step distance of the working face is about 45.4 m,the peak stress is 31.4 MPa,the cyclic pressure step distance is 25.1 m,the peak pressure stress is 30.5 MPa,and the subsidence of the working face roof is 4.1 m.2.The distance be-tween the working face and measuring point exceeds 80 m,the displacement of the roadway surface is almost 0;When the deformation and failure rate of the surrounding rock of the roadway gradually increases sharply within a range of 50 m from the measuring point,the surface displacement of the roadway increases sharply until the peak state of the advanced support stress is reached within a range of 15 m from the measuring station.
coal seam grouplower coal seammineral pressure manifestationadvance support pressure
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