Simulation Analysis of Coal Mining with Top-Coal Caving Under Hard-and-Thick Strata

1 Introduction A large amount of coal seam with hard coal and hard roof exists in the east mining area of China, such as in the representative mining area of Xuzhou, where the hardness is relatively large (f >2); the roof is hard and the thickness is relatively large (about 20 m). Two key problems must be solved for the suc- cessful application of fully-mechanized coal face with top-coal caving technology: the first is the top-coal falling ability and the second is the control of the hard-and-…

Simulation Analysis of Coal Mining with Top-Coal Caving Under Hard-and-Thick Strata

The top-coal failing ability is a key factor to analyze for the application of coal mining with top-coal caving. Based on a hard-and-thick strata, which acts both as the floor of the upper coal seam and as the roof of the lower coal seam, nine mining projects wcrc put forward to examine the mining of upper and lower coal seams, and a numerical simulation was used to study in detail the corresponding top-coal compressed volume of the lower coal seam. By the simulation effects of different layouts of coalface, the rational mining method was determined to bc the staggered layout of coalface in the upper and the lower coal seam. This can ensure the successful use of fully-mechanized coalfacc with top--coal caving in the lower coal seam.