Action time of explosion-produced seismic waves on guarded objects during large-scale blasting at open pit mines

The analysis of actual duration of a seismic impulse in large-scale blasting (2.10 s) as against the estimated duration (1.16 s) necessitates investigation of explosion-generated seismic wave formation and propagation. The action time of power loads governs the rate of damage of mining and construction objects. In this respect, this study aims to determine duration of seismic impulse based on the mechanism of seismic wave generation in large-scale blasting. The proposed mechanism of action of short-delayed blasthole groups in jointed rock mass assumes that seismic waves are generated during explosions owing to high-velocity collision of separate particles in the blast source area. The largest seismic source area is formed at the last blasthole group, which induces an essential increase in the seismic impulse duration. The formulas for calculating action times of explosion-generated seismic waves on guarded objects are obtained. The numerical calculation from the formula of seismic impulse duration and the comparison of the calculated and actual data prove validity of the formula. The seismic impulse duration studies make it possible to determine geometry of a seismic source area of a large-scale blast. The results can be used to develop blasting regulations toward minimization of seismic load generated by large-scale blasts on guarded objects.

Tyupin V. N. Action time of explosion-produced seismic waves on guarded objects during large-scale blasting at open pit mines. MIAB. Mining Inf. Anal. Bull. 2021;(4):124133. [In Russ]. DOI: 10.25018/0236_1493_2021_4_0_124.

V.N. Tyupin, Dr. Sci. (Eng.), Professor, e-mail: tyupinvn@mail.ru, Belgorod State National Research University, 308015, Belgorod, Russia.

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