For many years, electronic initiation has taken the time parameter to the center of blasting designs forever. Although this parameter existed before the era of electronic detonators, Blasting engineers or blasters could not handle it directly; Technology imposed it. Only fixed values were available.
Today, the fact that we can choose any detonation time for an explosive charge questions the feasibility of most of the rules applied to blasting design. Therefore, the famous delay charging method, which allows predicting a level of vibration at a given distance (“Chapot law”), is no longer necessarily valid when electronic initiation is used. Therefore, it must be approached in a totally different way. The KUZ-RAM formula, which allows fragmentation to be predicted, is also subject to the same distortion.
The objective of this article is to show how the calculation laws used for blasting design are influenced by the time parameter (sequence) and how we can make the most of this, in particular for vibrations.