Layout of Mining Roadway in Close-Distance Coal Seam Under Residual Section Coal Pillar
The layout and location selection of mining roadway in close-distance coal seam under residual section coal pillar is very important.Taking the layout of mining roadway in 21806 working face of lower coal seam in Qinglong Coal Mine as the research background,through the combination of theoretical analysis and numerical simulation,the maximum failure depth of 16# coal seam floor,the load of residual section coal pillar and the stress distribution of floor rock mass near coal pillar were studied.The layout and location of mining roadway in 21806 working face were determined by numerical simulation and empirical formula.The results are shown as follows.The maximum failure depth of 16# coal seam floor is 8.6 m,and the uniform load of coal pillar is 10.5 MPa.With the increase of depth,the peak position of vertical stress of the floor rock mass near the coal pillar is always located directly below the center of the coal pillar,the number of horizontal stress peaks changes from 1 to 2,and the position gradually moves from the center of the coal pillar directly below the goaf.The peak position of shear stress changes little.According to the stress characteristics of surrounding rock after roadway excavation at different layout positions and the empirical formula,the mining roadway of 21806 working face adopts an inner stagger distance of 15 meters.
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