Rational parameters of fully mechanized top-coal caving in extra-thick coal seams
In order to determine the rational parameters of fully mechanized top-coal caving technology in extra-thick coal seams at Buliangou Coal Mine,we did in-site measurement on the duration of continuous top-coal caving by one support following single wheel sequential caving order,and determined in-circle location and caving intervals of large,medium,small and micro scale caving based on the large,medium,small and micro caving theory in inclined direction.We also defined the losses of different drawing intervals from top coal movement track curve equations of the inclined direction based on top coal movement track curves in different caving heights and different circles tested by multiple position extensometers laid following strike directions.The research results show that when a single drawing outlet is fully caved,the influence distance of working face in trending is 6～12 supports,and the drawing influence radius of inclined single support is 7.6 m on average."Large"coal drawing employs at both ends of the cycle,"medium"coal drawing in the middle,"small"and"micro"coal drawing alternated in the rest.The average strike impact distance of the support drew at 12.3 m vertical height is 4.9 m,and that at 8.3 m vertical height is 3.8 m.The top coal strike migration equation of different drawing steps is determined by fitting theory,which comes out the circulation step distance of 0.8 m reducing 694 t coal loss superior to1.6 m.The research results provide a basis for guiding the rational coal drawing and improving the recovery rate of resources in fully mechanized caving of the extra-thick coal seams at Buliangou Coal mine.
extra-thick coal seamfully mechanized top-coal cavingtechnology parameters of coal drawingtop coal migration along the strike
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