Study on Mine Pressure Behavior Law of Mining Roadway Passing Concentrated Coal Pillar and Goaf

Based on the special spatial position of 1–2 coal and 2–2 coal, this paper adopts a new way modeling by fish overcomes difficulty modeling, simulates influence pillar 22,206 return airway after mining seam Flac3D, studies under primary secondary mining, puts forward support scheme airway. The following conclusions are obtained: (1) After stress 22,206–return residual increased. maximum is below middle its vertical (σvmax) horizontal (σhmax) 6.24 MPa 4.09 MPa, respectively. (2) rule airway’s pressure appearance that plastic zone becomes larger when near pillar, smaller far from failure radius roof floor only 1.3 m, 0.6 roadway side m 1.5 second mining. (3) According to proposed scheme, field experiments found displacement less than 120 mm, which can effectively guarantee stability roadway.