Ishchenko K.S., Konoval V.M., Lohvyna L.O. An effective way to rock mass preparation on metallic and nonmetallic quarries Ukraine

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 146

Geoteh. meh. 2019, 146, 28-40

 https://doi.org/10.1051/e3sconf/201910900031

AN EFFECTIVE WAY TO ROCK MASS PREPARATION ON METALLIC AND NONMETALLIC QUARRIES UKRAINE

¹Ishchenko K.S.,²Konoval V.M., ¹Lohvyna L.O.

¹Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Science of Ukraine, ²Cherkasy State Technological University

UDC               622.235.233                                             

Language: English

Abstract.

The article is aimed at developing method in experimental studies and industrial-Poligon particular conditions justifying the choice of a rational design of an explosive charge for an effective way to rock mass preparation on metallic and nonmetallic quarries Ukraine. The comparative results of the evaluation of the stress wave’s amplitudes studies and the character of crushing hard media from the explosion of the charge explosives-variable and constant cross section. It has been established experimentally that with an explosion of a variable height charges, the stresses in a compression wave is higher than with an explosion of constant cross section charges. It is shown that the total mass of the model parts break by the explosion by a variable cross section charge is greater than with the explosion of other designs charges such as: of constant cross section, variable diameter along the charge column with the boiler extension on bottom and with an air gap. This increases the volume as large fractions d_i>50 mm and the average diameter of the piece. The dependences of the particle size distribution of various designs explosive charges destroyed by the explosion are constructed. In industrial conditions, the rationale for the explosive boreholes location according to the massif structure. Adjusted boreholes location grid on rational parameters blasting unit, determined using a novel method of breaking rock complex structure. A new design of a combined borehole charge of variable cross section has been proposed. The use of the proposed design of the combined borehole charge of variable cross-section makes it possible, with a constant mass of charge, to increase its length and, as a result, to more evenly distribute the explosives over the step height. At the same time, the conditions for the transfer of energy from the charge explosive change when a multi-gradient and multidirectional stress field is formed in the massif that collapses. Industrial tests performed and evaluation of the effectiveness of the proposed method blasting locally fractured rocks and ore deposits on non-metallic minerals. Recommendations on their use are given.

Keywords: rock mass, explosive, charge structure, particle size distribution

 

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About the authors

IshchenkoKostiantyn Stepanovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher in the Department of Rock Explosion Mechanics, Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Science of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

KonovalVolodymyr Mykolaiovych, Candidate of Technical Sciences (Ph.D.), Associate Professor of the Department of civil and industrial building of the Cherkasy state technological university, Cherkasy, Ukraine

Lohvyna Lyudmyla Oleksandrivna, Master of Science, Junior Researcher in the Department of Rock Explosion Mechanics, Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Science of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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