厚硬顶板小煤柱沿空掘巷围岩稳定性控制研究OA

Aiming at the serious problem of surrounding rock deformation in the stoping roadway of the thick and hard roof working face of the 15#coal seam in Hongyuan Coal Industry,taking the 15203 working face as the engineering background,the roof structure and stress distribution variation law of the end of the working face are comparatively analyzed.FLAC3D simulation is adopted to analyze the plastic zone distribution law under the conditions of reserving 6 m,8 m,10 m,and 12 m coal pillars,and the reasonable coal pillar size is determined to be 6-8 m.FLAC3D simulation is adopted to analyze the stress distribution law under conditions of different anchor rod spacings and anchor cable layout ways.Technical measures such as improving pretension,strengthening key part support,increasing protective surface areas and others are proposed,and a support design scheme is formulated.The on-site tests show that during the stoping period,the accumulated displacement amount of the roadway two sides is 288 mm,the accumulated displacement amount of the roof and floor is 179 mm,and the deformation of the roadway surrounding rock is controlled within a reasonable range,providing technical references for the surrounding rock control of working faces with similar conditions.