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I posted this question in physics, but they advise me to post it here so here I am.

I was looking for the formula to calculate the burden in bench blasting and I found this document. The problem is I have to calculate the concentration of the charge first with the unit kg/m. I know that some materials are given but I need the formula to calculate other materials in which I have their energetic values calories/g calories/cm3 ..

Fred
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Tintin
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1 Answers1

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The charge concentration, in kilograms per meter of drill hole, serves two purposes. The first is being able to determine the amount of explosives needed to blast a given amount of rock. This is needed when ordering explosives from the supplier or when taking out enough explosives from the magazine.

$M_{Explosives} \ = \ I_b \cdot N \cdot (L_H \ - \ L_S)$

Where:

  • $M_{Explosives}$ is the mass of explosives required [kg]
  • $I_b$ is the charge concentration [kg/m]
  • $L_H$ is the length of the drill holes [m]
  • $L_S$ is the length of the stemming [m]
  • $N$ is the number of drill holes

The other purpose of the charge length is, if one knows the energy equivalent of each type of explosive [J/kg], for its given density of explosive, it becomes possible to calculate the amount of energy expended in the blast by the explosives used.

Fred
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