A computer model study of fragmentation
in open pits and quarries
S. Berdoudi1*, A. Hafsaoui2, K. Talhi3
B.P 12, Annaba University, Algeria
Berdoudi Said, 126 Lotiss 01 El harrouch skikda 21400
Received: 25 April 2009; revised version accepted: 02 June 2009
Theoretical considerations presented in this paper have been brought together to create a computer model of a blast, a bench blast and a crater blast, with which it is possible to establish trends and to begin predicting separately the result in each parameter.
The computer technique showed that the burden was the mast important blast parameter regarding fragmentation. An explosive with a very high detonation velocity could give as bad fragmentation uniformity as on of a very low detonation velocity (in bench blasting), the explosive initiation point had a noticeable effect on the explosive energy distribution. It may be said, in general, that the region ahead of the direction of firing is one of relatively height peak strain amplitude while the region behind the direction of firing is one of relatively low peak strain amplitudes.
It was apparent, from the point of view of uniformity of the fragmentation in the blast product, that bottom and centre ignition gave the best result in bench blasting, but bottom ignition gave best result in crater blasting.
Keywords: Fragmentation; Demolition with explosive; Data processing model; Explosive energy.