Belgorod State University, Belgorod, Russia:

Tyupin V. N., Professor, Doctor of Engineering Sciences, tyupinvn@mail.ru

The review of literature sources has allowed determining the mechanism of seismic blasts waves in jointed rock mass. The author presents the theoretical formulas for calculating stresses, relative strains and displacement velocities induced in rock mass by large-scale blasts. The formulas take into account the detonation characteristics of explosives, the borehole diameter, the length of explosive charges, the number of simultaneously blasted charges per groups and the factor of explosion energy redistribution to rock throw. Moreover, the formulas include the properties of rocks between the blasting point and a guarded object, and on the exposed surface of a guarded object. The compressive stresses, relative strains and displacement velocities in rocks are calculated from the formulas. The theoretically found change in the displacement velocity versus distance agrees with the field measurement data obtained in an open pit mine of Polyus company. The formulas of stresses and relative strains were used to define seismic impact exerted by large-scale blasts on the barrier of dry dock No. 1. Based on the calculated results, the recommendations are developed on reduction of seismic impact of blasts during dredging in the dock. The research findings are applicable to developing blasting regulations toward reduction in seismic impact of large-scale explosions on exposed surfaces in rock mass, as well as on the ground surface structures and buildings.

1. Sadosvky M. A. Seismic of blasts and seismology. Izvestiya AN SSSR. Fizika Zemli. 1987. No. 11. pp. 34–42.
2. Adushkin V. V., Spivak A. A. Underground blasts. Moscow : Nauka, 2007. 579 p.
3. Mosinets V. N. Crushing and seismic effect of explosion in rocks. Moscow : Nedra, 1976. 270 p.
4. Kutuzov B. N. Safety of blasting in mining and industry : Teaching aid. Moscow : Gornaya kniga, 2009. 670 p.
5. Alenichev I. A. Rock mass response to dynamic effect of blasting in the area of open pit mine. GIAB. 2018. No. 7. pp. 189–195.
6. Sovmen V. K., Kutuzov B. N., Maryasov A. L. et al. Seismic safety in blasting. Moscow : Gornaya kniga, 2002. 228 p.

7. Tseitlin Ya. I., Smoliy N. I. Seismic and shock air waves in industrial-level blasts. Moscow : Nedra, 1981. 192 p.
8. Tsibaev S. S., Renev A. A., Pozolotin A. S., Mefodiev S. N. Assessment of seismic impacts on stability of openings in underground mines. GIAB. 2020. No. 2. pp. 101–111.
9. Segarra P., Sanchidrián J. A., Castedo R., López L. M., Del Castillo I. Performance of some coupling methods for blast vibration monitoring. Journal of Applied Geophysics. 2015. Vol. 112. pp. 129–135.
10. Kumar R., Choudhury D., Bhargava K. Determination of blastinduced ground vibration equations for rocks using mechanical and geological properties. Journal of Rock Mechanics and Geotechnical Engineering. 2016. Vol. 8, No. 3. pp. 341–349.
11. Gui Y. L., Zhao Z. Y., Jayasinghe L. B., Zhou H. Y., Goh A. T. C., Tao M. Blast wave induced spatial variation of ground vibration considering field geological conditions. International Journal of Rock Mechanics and Mining Sciences. 2018. Vol. 101. pp. 63–68.
12. Li J. C., Li N. N., Chai S. B., Li H. B. Analytical study of ground motion caused by seismic wave propagation across faulted rock masses. International Journal for Numerical and Analytical Methods in Geomechanics. 2017. Vol. 42, No. 1. pp. 95–109.
13. Kutuzov B. N., Tyupin V. N. Definition of size of regulated crushing area during the charge blasting in fissured massif. Izvestiya vuzov. Gornyy zhurnal. 1974. No. 8. pp. 30–35.
14. Kutuzov B. N., Tyupin V. N. Determination of damage zones induced by blasting in jointed rock mass. Izvestiya vuzov. Gornyi zhurnal. 1983. No. 4. pp. 53–58.
15. Tyupin V. N. Explosive and geomechanical processes in highstress jointed rock mass. Belgorod : ID Belgorod NIU BelGU, 2017. 192 p.
16. Feshchenko A. A., Eristov V. S. Perimeter control blasting in waterworks construction. Moscow : Energiya, 1972. 117 p.
17. Ilin A. I., Galperin A. M., Streltsov V. I. Long-term slope stability control in open pit mines. Moscow : Nedra, 1985. 248 p.
18. Ignatenko I. M., Yanitsky E. B., Dunaev V. A., Kabelko S. G. Jointing of rock mass in open pit at the Zhelezny mine of the Kovdor Mining and Processing Plant. Gornyi Zhurnal. 2019. No. 10. pp. 11–15. DOI: 10.17580/gzh.2019.10.01.