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Published on 28 June 2016

THE IMPACT OF THE EXPLOSION OF A BOREHOLE CHARGE ON THE GRANULOMETRIC COMPOSITION IN THE UPPER AREA OF UNREGULATED CRUSHING

S.D. Viktorov, N.N. Kazakov, I.N. Lapikov, A.V. Shlyapin

The article describes the calculation method of fragmentation size of rocks in the top layer of a career ledge with account of the fracture of rocks and crushing effect of explosion of borehole charges. One of the main technological processes of extraction of solid minerals is breaking and crushing of rocks by blasting dispersed charges of industrial explosives. Efficient crushing of rocks by explosion ensures the effective implementation of all subsequent technological operations of mining industry. Transmission of explosion energy into a massif and its distribution in mountain mass are multi-zone and multi-phase physical processes. The area of crushing form crushing zones as its part with different boundary conditions and positions in relation to the charges. Each zone and each phase in a zone requires an individual theoretical approach and particular mathematical apparatus, which can describe the process of development phase and determine the final results of rocks crushing by action of this phase of the process. The most commonly used blasthole charges of industrial explosives do not provide consistent crushing of rocks throughout the surrounding volume. Explosion blasthole charge have no significant impact on the zone of the rock mass, which adjoins to the empty part of hole of a charge, and the destruction of the array in most cases is due to the splitting of rocks by natural separateness. Determination of granulometric composition of blasted rock mass, which is formed in the volume, adjacent to empty part at the design stage of an industrial explosion, is a separate task. The article describes the first proposed factor of rocks factionalism for different categories of fracture, which has become a base for development a table of coefficient of factionalism. The article describes the first proposed factor of rocks factionalism for different categories of fracture, which has become a base for development of a table of factionalism coefficients. A computer program was developed for determination of granulometric composition and oversized ore in the process of crushing of fractured rocks by the explosion in the upper layer of a quarry ledge. The article demonstrates the analysis of calculated results of fractured rocks crushing and oversized ore in the upper layer of the quarry ledge in five categories of fracturing of the rocks.
CityMoscow
CountryRussian Federation
UDC622.235
Issue2016, №2(Т.8)
Key wordscoefficient of factionalism, disintegrate of natural separateness, granulometric composition, output of oversized ore commodity, moldboard rock, phase explosion process, category of fracture, rock crushing
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Categories: Articles, Technical-and-Technological-Issues-of-SDMT

Tags: коэффициент фракционности, развал по естественным отдельностям, грансостав, выход негабарита, товарная руда, отвальная порода, фазы процесса взрыва, категория трещиноватости, дробление породы

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ISSN 1998-4502 (Print)                                                            ISSN 2499-975Х (Online)