关键词: 孤岛工作面, 松动圈, 非等宽煤柱, 锚注加固

Abstract: View of the engineering problems that the coal roadway of Jurassic isolated island working face in Northwest mining area is seriously broken, the deformation speed is fast and the on-site support is difficult under the action of high stress, the transportation chute of zf303 isolated island working face in Xiagou coal mine of Shaanxi Huabin group is taken as the research object, and the methods of theoretical analysis, borehole peeping and industrial test are adopted, The effects of geological factors and support factors are analyzed, the surrounding rock control scheme of "bolt grouting reinforcement" is designed, and the grouting reinforcement parameters are optimized based on theoretical analysis and field practice. The results show that the unique properties of Jurassic coal seam combined with unreasonable initial support parameters are the main reasons for the difficulty of zf303 transportation channel support; The range of 0 ~ 2m in the surrounding rock of zf303 transport channel is general fracture area, the range of 2 ~ 4m is fracture development area (plastic failure area), and the range of 4 ~ 10m is complete area. There is separation between coal seam and direct roof transition area; After adopting "bolt grouting reinforcement" in zf303 transportation channel, the deformation of surrounding rock is significantly reduced and the stability of roadway is effectively maintained.