STRESS DISTRIBUTION AND FAILURE DEPTH ANALYSIS OF MINING FLOOR IN CLOSE DISTANCE THICK COAL SEAM GROUP

The bottom stress distribution of close arrangement slicing in thick coal seam under the effect, according to the actual conditions of working face of Geology and production, using FLAC3D numerical simulation software on the 106 floor of 6 # coal mining area I1 coal seam stress is analyzed, and the results are compared with the theoretical calculation. The results show that the floor lithology and structure, mining technology is the main factor affecting the floor failure, the failure depth of the floor was 7.0m; the lower edge of the goaf of coal pillar under the pressure range is greater than the upper mining goaf pressurization area, decompression range under the goaf is lower to expand, is "spoon" distribution; Replace scheme 603 working face with the proposed abolition of 701 working face, the coal mining strata movement and the stress redistribution and the stress concentration caused by, will further increase the cost of roadway support and maintenance, but also increase the occurrence of mine mine power disaster risks.