Research on reasonable setting width and support parameter optimization of coal pillar in thick coal seam section
The reasonable setting of coal pillars in thick coal seam sections under the influence of min-ing is an important factor for efficient and safe coal mining.To solve this problem,the study was car-ried out based on the coal pillar in the section of return air lane of No.3 coal 2309 working face in Zhongneng Coal Mine.According to the limit equilibrium theory of surrounding rock,the reasonable width of coal pillar was 8 m.Combined with the Flac3D numerical calculation,the vertical stress and plastic zone of coal pillar with different widths were analyzed,and the remaining width of coal pillar should not be less than 8 m.For the roadway with coal pillar,the method of differentiated support was applied,and the method of three anchor cables on the side of coal pillar was used to strengthen the surrounding rock.In view of the hidden dangers such as soaking coal pillar,air leakage and harm-ful gas influx,local grouting and surface shotcrete of coal pillar were adopted to control them.Com-bined with the feedback of mine pressure monitoring,it showed that the width of coal pillar was rea-sonable and the supporting effect was good,which provided technical reference for coal pillar in similar thick coal seam section.
万方数据
维普
