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Blasting effect index The ratio of the radius r of the bottom radius of the blasting funnel to the minimum resistance line W, ie
n=r/W
In the formula:
N-blasting index.
According to the different blasting index, the funnel can be divided into four types (Figure 1).
Figure 1 Four basic forms of the blasting funnel
(É‘) loosening the funnel; (b) weakening the throwing funnel (strengthening loosening);
(c) standard funnel; (d) enhanced throwing funnel
First, the standard blasting funnel, at this time n = r / W = 1, in theory, the most effective use of explosives.
Second, strengthen the throwing funnel, at this time n = r / W > 1, after the blast, most or all of the rock is thrown out of the funnel, a part of the explosion can be used to throw the rock, 1 <n < 3 in the project, this is Open-air throwing is a common form of large blasting or directional throwing.
3. Strengthen the loosening funnel. At this time, 0.75<n=r/W<1. Only a few rock rafts are thrown after blasting. Most of the rock is only loose, also known as the weakening throwing funnel. It is a common blasting for tunneling. Funnel form.
4. Loosen the funnel. At this time, n≈0.75. After the blasting, the rock shovel does not scatter. It only loosens in place. At this time, the blasting funnel is called loose blasting funnel. When n<0.75, the shape is not a funnel after blasting. At this time, it is called compression blasting. After the explosion, only the rock near the medicine pack is broken, and in the engineering blasting, it is used for reaming (expanding pot) blasting.