Determination of drilling and blasting parameters considering the stress-strain state of rock ores

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Authors:

M.B.Fedko, Cand. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0003-4169-7425, State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

I.O.Muzyka, Cand. Sc. (Tech.), orcid.org/0000-0002-9202-2973, State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S.V.Pysmennyi, Cand. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0001-5384-6972, State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.V.Kalinichenko, Cand. Sc. (Есоn.), Assoc. Prof., orcid.org/0000-0002-9138-9271, State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Enhancing methods for determining parameters of drilling and blasting operations considering the stress-strain state of rocks.

Methodology. Dependency of the inclined exposure dip on the stress-strain state of rocks to be caved is determined by the analytical research technique and mathematical modeling applying the finite element method.

Findings. The work offers methods for determining the energy intensity factor for breaking ores onto the inclined exposure which considers the exposure dip while correcting drilling and blasting parameters. There are also offered calculated numerical limits for the above factor.

Originality. The scientific novelty consists in determining numerical values of the energy intensity factor for breaking the rock massif considering its stress-strain state when caving onto an inclined exposure (compensation area)taking into account its dip. The work suggests limiting the range of obtained numerical values of the factor when breaking the massif onto any type of exposures.

Practical value. Drilling and blasting parameters can be corrected depending on changes of the ore massif stress-strain state when caving it onto any type of exposures (horizontal, vertical or inclined). The dedicated computer program created enables immediate acquisition of basic drilling and blasting parameters for particular conditions and analysis of predicted values of fragmentation of the massif to be caved.

References.

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2. Fedko, M. B., Kolosov, V. A., Pismennyi, S. V. and Kalinichenko, Ye. V., 2014. Economic aspects of change-over to TNT-free explosives for the purposes of ore underground mining in Kryvyi Rih basin. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 4, pp. 79–84.

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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

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