Study on small coal pillar in gob-side entry driving and control technology of the surrounding rock in a high-stress roadway

The technology described as gob-side entry driving was adopted in the Zhaogu No. 1 mine to resolve issues pertinent mining succession tension, serious roadway deformation, and support difficulties. key parameters of coal columns must be studied ensure stable effect along-air tunneling under high stress. A calculation for vertical stress a pillar is proposed, location breaking line top plate hollowed zone determined by considering breakage attributes basic uppermost large structure layer, combined with internal external fields, limit equilibrium theories. FLAC3D software employed simulate geological requirements mine, characteristics pillar, surrounding rock technical plan leaving 4.5-m pillar. also used verify analyze actual measurements. outcomes suggest that roof break located at 2.65 m on side near area, there trapezoidal stability region around can provide lasting roadway. displacement two helpers between 100 500 mm, displacements bottom plates are less than 300 which ensures surrounded when high-stress occur. safety conditions.