Reasonable Width of Narrow Coal Pillar of Gob-side Entry Driving in Large Mining Height

To determine the reasonable width of the gob-side entry driving coal pillar in Xieqiao Mine, firstly, the theoretical analysis method was applied to construct the mechanical model for limit equilibrium area of coal seam edge, and the distance obtained via analysis between the bearing pressure extremum and the coal edge was 3.34 m. Secondly, the numerical simulation method was applied to analyze the roadway rock mechanics with different coal...