Application of medium deep hole blasting technology in rock roadway of large cross-section instruction at Xingdong coal mine

The deep hole blasting in roadway excavation can reduce time of auxiliary operation and improve single-circulating footage. By using the double wedge cutting in the rock roadway construction at Xingdong Mine, the embrasure utilization ratio have a good advance and the construction schedule is greatly improved and material consumption and staffing dropped, the promotion of this technology has acquired good results with easing the tense situation in the mine extraction of convergence.