However, millisecond delays can be used just as easily, and in many cases will provide superior fragmentation because of the small burdens compared to bench blasting
Designing a proper explosive charge and depth of burial requires an understanding of bench blasting
principles and rock breakage mechanisms.
The source of seismic vibrations in the Maglovec quarry near Presov was tristichous bench blasting Nr.
The next blasting focused on monitoring the seismic impact on diorit porphyrite bearing in the Maglovec quarry was a bench blasting Nr.
The blast design is such that the outer holes are fired and break as in normal bench blasting
but the others are too constricted to break sideways and therefore break more like a crater blast by swelling the rock in the axial direction.
He started by measuring the link between the rate of stemming ejection and the degree of rock-face movement in bench blasting.
Worsey concludes that explosion gases are largely responsible for the movement of rock in bench blasting.