Research on Relationship of Mining Height and Recovery of Top-coal in Full-mechanized Caving Mining

This paper applied numerical simulation to researching caving process of top-coal above powered support and analyzed relationship of mining height and recovery of top-coal under condition of fix thickness of top-coal and 2 different thicknesses.Result showed that mining height was larger;recovery of top-coal was higher.Full-mechanized caving mining with large mining height was good for increasing resource recovery in extremely thick coal seam.