esign and Practice of Strip Mining Parameters for Large Dip Angle Coal Seam Under Confined Aquifer

In order to study the development of water-induced fractured zones in mining large dip angle coal seams under confined aquifers in Xinhe Coal Mine, FLAC^3D numerical simulation software was used to study the development and evolution of overburden fracture during different strip mining parameters. The results show that: when the width of the working face is 30 m and the width of the coal pillar is 30 m, the deformation range of the roof and floor of the working face is significantly reduced. The development height of the water-induced fracture zone is 30 m, and the distance from the upper aquifer is 22 m. Field practice shows that: the average leakage of boreholes is 4 L/min in drilling depth of 67 to 96 m, and the maximum development height of water-induced fractured zones is 32 m, water-induced fractured zone on the roof of the working face has been effectively controlled. It ensured the safe mining of the coal seam with large dip angle under the confined aquifer in Xinhe Coal Mine and effectively prevented the accident of water inrush.