Experimental investigation on the movement mechanism of top coal in steeply inclined ultra-thick coal seams

The pre-blasting zones have a significant influence on the coal broken and the recovery rate of the top coal caving mining. This paper explores the coal movement mechanism in the top coal with pre-blasting zones based on the geological parameters of Jiangcang No. 1 mine in the western of China. The steeply inclined ultra-thick coal seam was mined by using the sublevel top-coal caving mining method. The geo-image process system (GIPS) software...