Research on Damping Blasting Technology of Medium-deep Hole in Large Stope of an Underground Iron Mine
A large underground iron mine adopts the large structure stage open stoping and subse-quent filling mining method,and adopts the upward fan-shaped medium-deep hole blasting.At present,the mining level of the mine is close to the surface.In order to reduce the influence of underground large-scale production blasting on the surface,the research on medium-deep hole damping blasting technology is carried out.Based on the theoretical analysis of the propagation law of blasting vibration,the maximum sin-gle-stage charge is determined for different levels.The shock absorption measures of'V'type initiation and electronic detonator millisecond initiation are put forward to reduce the blasting vibration wave on the basis of fine construction.The field practice shows that the above scheme has achieved the effect of shock absorp-tion blasting,which has reference value for the same type of mine.
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