Application of composite roof hydraulic fracturing technology in mining roadway of deep buried working face
In recent years,coal mining has gradually shifted from shallow coal seams to deep coal seams,and deep coal seam mining is facing severe high stress problems,resulting in serious deformation of surrounding rock of mining roadway.As one of the key means of pressure relief and danger elimination in deep coal seams,hydraulic fracturing technology has been rela-tively mature in its related technologies,processes and equipment.Aiming at the problem of large buried depth and high ver-tical stress of 130608 working face in a mine,which leads to large deformation of roadway surrounding rock,based on the ge-ological conditions and mining technical conditions of the working face,a hydraulic fracturing scheme of composite roof is proposed and applied in the field.The results show that the composite roof hydraulic fracturing technology and scheme have better pressure relief effect,reducing the peak stress of roadway surrounding rock by 23.53％～25.13％,decreasing the convergence of the roof and two sides by 41.64％～49.23％,thus effectively controlling the deformation of roadway sur-rounding rock,and ensuring the safe and efficient mining of working face.
deep buried working facemining roadwaycomposite roofhydraulic fracturesurrounding rock deformation
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