Research and Application of Hard Roof Weakening Technology for Thick Coal Seam with Large Dip Angle in Shanghai Mining Area

In order to solve the problem that the hard roof is not easy to fall in the large-inclination thick coal seam in the mine area of Shanghai Temple, the 1901 comprehensive blasting working face of Etuokeqin Changcheng No.6 Mining Co., Ltd. is used as a project example Due to the coal seam dip angle of this comprehensive blasting working face is between 24° and 29°, and the average is 26.5° the coal seam is very hard and contains two thick layers of mixed gangue, the roof is hard limestone geological conditions, in order to improve the coal mining efficiency and coal of this comprehensive blasting working face, the engineering personnel of Changcheng No.6 Mine carried out the study on the efficient coal mining of the large-inclination and coal rock comprehensive blasting working face by means of on-site investigation, theoretical analysis and entity simulation, and achieved the accurate weakening and efficient coal mining of the hard coal body of the 9 coal large-inclination comprehensive blasting working face of Changcheng No.6 Mine.