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DRILLING AND BLASTING OPERATIONS
ArticleName Influence of explosive charge cavity shape on energy requirements for rock fracturing
DOI 10.17580/gzh.2015.04.12
ArticleAuthor Kononov V. M.
ArticleAuthorData

Author:
Name & Surname: Kononov V. M.
Company: University of Mechanical Engineering (Moscow, Russia)
Work Position: Professor
Scientific Degree: Doctor of Engineering Sciences
Contacts: vmkononov@mail.ru

Abstract

The article describes theoretical and exploratory research and its commercial trial (in Severomuysky tunnel) aimed at explosive charge control in blastholes with preset orientation cuts made in the blasthole walls, that allow concentrating blast energy along the cut orientation and, consequently, reduction in powder factor, “smooth” excavation perimeter after blasting with minimized overrun/underrun and damage of adjacent rock mass (fracturing). The bench testing involved fracturing of various strength concrete blocks by charges placed in blastholes with and without cuts of various orientation, depth and shape; the principle parameters and relations have been determined, including the relation between the blasting energy content reduction coefficient КE and the cut depth and angle for various strength blocks, as well as the powder factor reduction. The pilot blasts carried out at a commercial level, considering the parameters obtained in the tests, proved the efficiency of the new technology.

keywords Blasthole charges, perimeter blasting, cuts in blasthole walls—stress concentrators, rock strength, cut depth and shape, bench tests, recommended parameters, commercial trial
References

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