Prevention Technology of Strong Strata Behaviors of Mining Roadway with Hard Roof and Hard Coal

Aiming at the problem of strong strata appear of mining roadway with hard roof and hard coal, based on the field observation and theoretical analysis, the strong strata behavior of roadway is analyzed and prevention measures with break-top blast in deep hole and large diameter pressure relief hole are proposed, and the blasting parameters and the layout of the pressure relief hole are determined. By comparing the deformation of the roadway and the intensity of micro-seismic activity, the effectiveness of the prevention measures is tested. The result indicates that the prevention measures mentioned above safely release the elastic energy of the coal body in mining roadway, destroy successfully the integrity of hard roof in mined-out area and energy storage conditions of coal pillars, eliminate the dangerousness of strong strata behaviors of mining roadway, ensure the safety and efficiency of the mine.