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Underground blast design<br />
Design of cut<br />
The following formulae are used for <strong>the</strong> geometric design of <strong>the</strong> cut area:<br />
For multiple reamer holes: ø = d n<br />
Where: d = diameter of empty reamer holes; n = number of reamer holes<br />
The cut:<br />
1st square: a = 1.5ø<br />
W1 = a 2<br />
ø mm = 76 89 102 127 154<br />
a mm = 110 130 150 190 230<br />
W1 mm = 150 180 210 270 320<br />
2nd square: B1 = W1<br />
C-C = 1.5W1<br />
W2 = 1.5W1 2<br />
ø mm = 76 89 102 127 154<br />
W1 = 150 180 210 270 320<br />
C-C = 225 270 310 400 480<br />
W2 mm = 320 380 440 560 670<br />
3rd square: B2 = W2<br />
C-C = 1.5W2<br />
W3 = 1.5W2 2<br />
ø mm = 76 89 102 127 154<br />
W2 mm = 320 380 440 560 670<br />
C-C = 480 570 660 840 1000<br />
W3 mm = 670 800 930 1180 1400<br />
4th square: B3 = W3<br />
C-C = 1.5W3<br />
W4 = 1.5W3 2<br />
ø mm = 76 89 102 127<br />
W3 mm = 670 800 930 1180<br />
C-C = 1000 1200 1400 1750<br />
W3 mm = 1400 1700 1980 2400<br />
© <strong>Dyno</strong> <strong>Nobel</strong> Asia Pacific Pty Limited 2012. Reproduction without permission is strictly prohibited.<br />
W3<br />
W3<br />
W1<br />
W1<br />
W2<br />
W2<br />
W4<br />
a<br />
B1<br />
C-C<br />
C-C<br />
W2<br />
C-C<br />
B3
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