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Perimeter control<br />
Perimeter blasting is a technique <strong>to</strong> reduce <strong>the</strong> overbreak/backbreak on a blast.<br />
It usually utilises decoupled charges in closely spaced blast holes.<br />
The following formula can be used <strong>to</strong> estimate <strong>the</strong> centre <strong>to</strong> centre distances of<br />
cartridged product for pre-splitting.<br />
PF =<br />
PF = Required powder fac<strong>to</strong>r (usually 0.3 <strong>to</strong> 0.6 kg/m 2 )<br />
L = Length of charged hole<br />
S = Spacing between holes<br />
D =<br />
L x S<br />
0.5<br />
L x QL<br />
B x S x PF<br />
D = Centre – centre distance between cartridges (mm)<br />
QL = Charge density of <strong>the</strong> explosive, in kg/m<br />
B = Burden<br />
© <strong>Dyno</strong> <strong>Nobel</strong> Asia Pacific Pty Limited 2012. Reproduction without permission is strictly prohibited.
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