Feasibility study on fully mechanized large mining height long wall top-coal caving mining in ultra-thick (20–30 m), parting-rich coal seams: A case study of the Laosangou mining field in China

To analyze the feasibility of fully mechanized large mining height long wall top-coal caving mining (LLTCC) in ultra-thick (20–30 m), parting-rich coal seams, a case study on No. 6 coal seam of the Laosangou mining field was conducted. First, the distribution pattern of the coal-seam structure was mastered and generalized based on the coal-seam thickness, parting thickness, and parting horizon. On this basis, physical simulation and UDEC...