Water Injection Softening Process and Effect Analysis for Hard and Thick Coal Seam in Fully Mechanized Caving Face

According to the coal seam condition of +618B₁₊₂ fully mechanized caving face in Xiaohonggou Coal Mine, it selected reasonable coal seam water injection parameters, and used the reasonable construction technique, then strengthened daily management of coal seam water injection, which had good effects for the recovery rate, lump coal rate, the output of raw coal, and dust suppression.