Research on influence of deep coal seam mining width on stability of coal pillars
Underestimation of the mining width of deep coal seams may cause coal pillar instability,surface subsidence,and mining structure damage,but overestimation will cause coal resources waste.The deep coal seam in No.6 mining area of Tashan Coal Mine in Shanxi Province was analyzed as an example,and the FLAC3 D software was used to simulate the evolution law of the plastic zone width,elastic core ratio and vertical stress of the coal pillar with different widths of the coal pillar under the maximum recovery rate,and the optimal mining width was 100 m,which ensured the long-term stability of the coal pillar and the maximum recovery rate of coal reached 45％.After the implementation of this program in No.6 mining area of Tashan Coal Mine,compared with No.5 mining area,the percent-age of damaged area of the roadway surrounding rock was reduced from 68.4％to 29.6％,with a maximum reduction of 38.8％,and the area recovery rate was increased from 36.7％to 46.4％.
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