NorNickel’s Polar Division, Norilsk, Russia:

T. P. Darbinyan, Director of Mining Practice Department, Candidate of Engineering Sciences

Medvezhyi Ruchei LLC, Norilsk, Russia:

I. I. Uvarov, Deputy CEO—Chief Engineer

Geotechnical Engineering Laboratory, Gipronickel Institute, Saint-Petersburg, Russia:

A. V. Fedoseev, Leading Researcher, Candidate of Engineering Sciences, FedoseevAV@nornik.ru
A. V. Trofimov, Head of Laboratory, Candidate of Engineering Sciences

In open-pit mineral mining with drilling and blasting, a significant part of buildings and structures, as a rule, suffer from the blasting-induced seismic impact. Some production facilities under consideration, due to their long service life, have defects, which makes them less resistant to the blasting-induced seismic impact. In such cases, assessment of the blasting-induced seismic impact requires experimental investigation to be performed. The main and common characteristic in the assessment of the seismic impact induced by the air blast wave that can cause damage to natural and engineering structures is the peak particle velocities measured in the area of these structures. The approach proposed by M.A. Sadovsky was applied to determining PPV due to the blasting-induced seismic impact. The scope of this work included the research of seismic wave propagation from explosions in an open pit at Zapolyarny Mine of Medvezhyi Ruchei LLC. ZETLAB seismographs were used to study the effect of the seismic explosion waves on the protected facilities. The research was performed for the upper rock mass strata composed of basalts. The tests were carried out to determine physical and mechanical properties of basalts. The measurement profiles of blasting-induced seismic waves were oriented in the northern, western and northwestern directions. As a result of the measurements and experimental data processing using the regression analysis in the range of reduced distances from 11 m/kg^1/3 up to 1100 m/kg^1/3, the relation of the reduced distance and PPV was obtained. The relation makes it possible to determine the permissible weight of a single charge to ensure safety of the protected structures.

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