NorNickel’s Polar Division, Norilsk, Russia

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

Geotechnique Laboratory, Gipronickel Institute, Saint-Petersburg, Russia
A. V. Fedoseev, Leading Researcher, Candidate of Engineering Sciences, FedoseevAV@nornik.ru
A. V. Yavarov, Leading Researcher, Candidate of Engineering Sciences
P. A. Tyapkina, Category III Engineer

The world practice says that the main estimate of seismic effect generated by a blasting wave capable to damage engineering structures is the peak particle velocity (PPV) of vibrations induced in ground under the structures. This parameter is a criterion of seismic safety for various guarded facilities (buildings, structures, rock masses, slopes, equipment, etc.) since PPV correlates better than displacements or accelerations with the data of observations over initiation and growth of structural defects. The international experience gained in prediction and estimation of blasting-induced seismic effect on guarded facilities is reviewed. In accordance with the domestic and foreign approaches, the output data of experimental measurements are compared for the parameters of energy velocity (by Sadovsky) VSad, maximal vector sum PVSmax and maximum PPVmax along one of the coordinate axes. The comparison of the allowable explosive charge weights per delay stages, calculated using each of the procedures, revealed the significant differences between them, up to an order of magnitude. At the same time, the results obtained using the commonly used energy velocity VSad and the cube root of the charge weight are comparable with the weight of explosives for a whole blasting block. It is mentioned that the regulatory documents in Russia lack recommendations on PPV prediction depending on explosive charge weight, frequency content, free frequencies of buildings and structures and their distances to a blasting site. It is necessary to elaborate a standard to regulate procedures for the blasting-induced seismic wave attenuation and to limit blasting-induced effects for a wide list of facilities (buildings, structures, equipment, underground roadways, tunnels and slopes) with regard to the level of their damage.

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