Explosioncrater3HcraterindexCrater index n is a ratio of radius rto line of leastresistance W.n=W122016/11/9Chapter5:Mechanicsofrockblasting
2016/11/9 Chapter 5: Mechanics of rock blasting 12 Explosion crater Crater index n is a ratio of radius r to line of least resistance W. crater index W r n
Patterns ofexplosion crateran=1.0Crater of standard blastinofor throwing rockb2n >1.0Craterof strengthenedblastingforthrowingrockcharge0.75<n<1.0(b)Crater of weaken blasting forthrowing rockC(strengthenedblastingforlooseningrock)dn<0.75Crater of blastingforlooseningrock(c)(d)132016/11/9Chapter5:Mechanicsofrockblasting
2016/11/9 Chapter 5: Mechanics of rock blasting 13 d c b a Crater of standard blasting for throwing rock Crater of strengthened blasting for throwing rock Crater of weaken blasting for throwing rock （strengthened blasting for loosening rock） Crater of blasting for loosening rock n > 1.0 0.75 < n < 1.0 n = 1.0 n < 0.75 Patterns of explosion crater