Abstract: The litter radius of blasting powdering region is, the fewer ore fines generates. It indicates that calculating the radius of powdering region has great significance to blasting optimization. Through theoretical analysis and combined with detonation theory, attenuation law of shock wave and failure criterion of rock, radius of powdering region was calculated. Compared the results with study of А.Н.Ханукаев, the calculated values were the identical, which verified the reliability of this calculate method in this paper.

Key words: Blasting, Coupling charge, Radius of powdering region, Detonation wave