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1. When using shallow hole blasting, the hole distance is:
É‘=mW d
In the formula:
M-gun hole proximity coefficient, generally m=1.2～1.4; when using the differential blasting, the ore rock mass is small, take m=1.8～2.0; extremely hard and difficult to explode rock layer or require large blockiness after blasting When rock, take m=0.8~1.0.
2. When deep hole blasting is used, the hole pitch can be calculated as follows:
É‘=Q/HW'q
In the formula:
Q-blast hole charge, kg;
W'-resistance line, m, the front row of holes is according to the chassis resistance line, and the rear row of holes is calculated according to the row spacing;
Q-unit explosive consumption, kg/m 3 .
The calculation formula of the blasthole proximity coefficient is:
m=É‘/W
The blasthole proximity coefficient is a very important parameter. In the past, the m value should be 0.8-1.4. With the development of blasting, if the area of ​​the blasting hole network is constant, the resistance line or row spacing is appropriately reduced to increase the hole spacing. Can improve the effect.