Substantiation of ultimate delay time toward reduction in large-scale blasting-induced load in open pit mines

Authors: Tyupin V.N.

The article focuses on determination of an ultimate delay time such as the interaction of seismic blast waves (SBW, cumulative effect) of neighbor short-delay blasts is absent. The technical literature review allowed physical model of interaction between SBW in short-delay blasting (SDB) in jointed rock mass. The first blast generates high-pressure detonation products which form a deformation wave which propagates from the blasthole to the outer boundary of the crushing zone. Then, from the outer boundary of the crushing zone, SBW propagates. The lim formulas of the ultimate delay time in short-delay blasting in open pit mines are obtained. lim The mathematical analysis finds out that should be increased when explosives have high detonation characteristics and decreased when rocks have higher strength and degree of jointing. The values of are calculated as function of blasthole diameter, ultimate compression strength of rocks and rock jointing. The ultimate delay times are computed for standard blasting patterns in rock mass having different jointing degrees. The comparison of the calculated lim with the field data prove appropriateness of the formulas. The studies, after commercial testing, can, supposedly, help amend the effective blasting regulations for the purposes of reducing large-scale blasting-induced load.

Keywords: large-scale blasts, open pit mines, short-delay blasting, seismic blast waves, cumulative effect, ultimate delay time, calculation formulas, numerical calculations, appropriateness.
For citation:

Tyupin V. N. Substantiation of ultimate delay time toward reduction in large-scale blasting-induced load in open pit mines. MIAB. Mining Inf. Anal. Bull. 2022;(12):67-76. [In Russ]. DOI: 10.25018/0236_1493_2022_12_0_67.

Issue number: 12
Year: 2022
Page number: 67-76
ISBN: 0236-1493
UDK: 622.2:614.83(075.8)
DOI: 10.25018/0236_1493_2022_12_0_67
Article receipt date: 14.02.2022
Date of review receipt: 23.05.2022
Date of the editorial board′s decision on the article′s publishing: 10.11.2022
About authors:

V.N. Tyupin, Dr. Sci. (Eng.), Professor, e-mail:, Belgorod State National Research University, 308015, Belgorod, Russia, ORCID ID: 0000-0002-3709-0957.


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