Background::
China's thin and extremely thin coal seam resources are widely distributed and
rich in reserves. These coal seams account for 20% of the recoverable reserves, with 9.83 billion tons of
industrial reserves and 6.15 billion tons of recoverable reserves.
Objective:
Due to the complex geological conditions of the thin coal seam, the plow mining method
cannot be effectively popularized, and the drum mining method is difficult to be popularized and applied
in small and medium-sized coal mines, so it is necessary to find other more advantageous alternative
mining methods.
Methods:
The equipment integrates mining operations, conveying operations, and supporting operations,
and is suitable for mining short and extremely thin coal seam with a height of 0.35m-0.8m and
width of 2m-20m. It has the advantages of the low body of the shearer, no additional support on the
working face, and small underground space. The mining efficiency of thin coal seam and very thin coal
seam can be improved and the mining cost can be reduced.
Results:
Thin coal seam shear mining combines mining, conveying, and supporting processes together
and has the advantages of a low fuselage, no extra support required for the working face, and feasibility
in a small underground space.
Conclusion:
The summarized mining method can improve the mining efficiency of thin and extremely
thin coal seams, reduce mining costs, and incorporate green mining practices, which take both mining
economy and safety into account.
Mechanism of Secondary Breakage in the Overlying Strata during Repetitious Mining of an Ultrathick Coal Seam in Design Stage
