Control Technology of Roadway Surrounding Rock for Close-distance Seams With Hard Roof

Combining with the field geological conditions in 5305 mining roadway of Ganzhuang Coal Mine, analyzing the failure mechanism, the main reasons that lead to the 5305 recovery roadway deformation and failure are the influence of pillars in upper close-distance gob, the mining influence of adjacent working face in the seam and the weak strength of original support system. Base on theoretical analysis, the deformation features of roadway surrounding under the high stress are simulated by FLAC^3D numerical simulation, combining design principle of "three high and one low" and economical benefit, the rational support parameters for 5305 mining roadway are determined. The engineering practice indicates that the new scheme has a good effect.