Distribution characteristics and control strategies of strong mining pressure in shallow buried thick coal seam under high-intensity mining
During high-intensity mining of shallow buried thick coal seams,the mining pressure manifestation on the mining face is strong,causing a considerable impact on safety production of coal mines.Taking the No.5302 fully-mechanized working face in Wujia-gou Coal Mine as the engineering background.The mechanism of fracture and instability of the roof and overlying rock strata in shallow and thick coal seams was theoretically analyzed.Numerical software was employed to simulate and analyze the fracture characteristics of the overlying rock and the distribution pattern of forward stress on the working face.The study revealed the manifestation pattern of strong mining pressure manifestation in fully-mechanized working face with shallow buried hard roof and proposed control strategies uti-lizing hydraulic fracturing to break the roof and reduce the forward pressure.The research findings indicate that the key layer in the o-verlying rock of the coal seam plays a major controlling role in the collapse,fracture,and movement of the overlying rock of the entire working face during fully-mechanized mining of shallow buried thick coal seams.Compared to ordinary working faces,the movement of the overlying rock strata is more intense during mining,resulting in a pronounced manifestation of mining pressure on the mining face and a higher development height of the two zones.Segmented hydraulic fracturing can make the roof collapse more fully by breaking it,effectively reducing the advanced pressure of the working face,increasing the degree of collapse filling in the goaf,and accelerating the stable speed of mining impact.
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