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Processes of initial stage of expansions of explosive cavity in blasthole charge

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Category: Mining

Last Updated on 19 January 2017

Published on 19 January 2017

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Authors:

V.P.Kurinnyi, Dr. Sc. (Tech.), Prof., State Higher Educational Institution “National Mining University”, Dnipro, Ukrainе e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

I.P.Garkusha, Cand. Sc. (Phys.-Math.), Prof., State Higher Educational Institution “National Mining University”, Dnipro, Ukrainе e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V.O.Nikiforova, Cand. Sc. (Tech.), Senior Research Fellow, M.S Polyakov Institute of Geotechnical Mechanics under the NAS of Ukraine,Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Research into processes that occur in the blasthole and rock during the first 300 s after a detonation wave passing the given blasthole cross-section and determine the effectiveness of rock fracture.

Methodology. The analytical method of research based on fundamental positions of solid medium mechanics was applied.

Findings. The mechanisms of rock fracture in fine-dispersed crushing zone were considered. The valuation of dependences versus time of the blasthole radius increase, the displacement velocity of blasthole walls and of the detonation products pressure changing during the first 300 s after the explosion, was fulfilled. It is shown that the pressure in fine-dispersed crushed zone decreases exponentially and is inversely proportional to the square root of the distance to the blasthole axis.

Originality. It was found that the main mechanism in the fine-dispersed destruction zone is instantaneous rock destruction by shear stress. The particles size, into which the rock breaks down, is directly proportional to the width of chemical reaction zone in the explosive. Dependencies of explosion cavity radius, rock fracture velocity at the contact with detonation products and detonation products pressure on time are estimated using the adiabatic equation for detonation products with a constant index, taking into account that a strong compression wave is formed in the rock. It is shown that pressure decreases exponentially from the distance to the borehole axis in the fine-dispersed destruction zone.

Practical value. The result of this work makes it possible to develop explosives with small fine-dispersed destruction zone and substantiate charges parameters with inert and water interval, thus reducing the size of a finedispersed destruction zone.

References/Список літератури

1. Menzhulin, M.G. and Brovin, V.E., 2007. Energy efficiency of rocks destruction by blasting of explosives with different detonation characteristics. Blasting affair, No. 98/55, pp. 55–62.

Менжулин М.Г. Энергетическая эффективность разрушения горных пород при взрыве ВВ с различными детонационными характеристиками / М.Г.Менжулин, В.Е.Бровин // Взрывное дело. – М.: ЗАО „МВК по ВД“, 2007. – № 98/55. – С. 55–62.

2. Kryukov, G.M., 2009. Evaluation of the time of rocks destruction by blasting the long charges of industrial explosives. Mining informational and analytical bulletin, Vol. 1, pp. 8–15.

Крюков Г.М. Оценка времен разрушения породы при взрыве в ней удлиненного заряда промышленных взрывчатых веществ / Г.М.Крюков // ГИАБ. – 2009. – № 1. – С. 8–15.

3. Kurinnoy, V.P and Garkusha, I.P., 2012. On the adiabatic equation for detonation products of explosive. In: International Scientific School named after Academician S.A. Khristianovich The International scientific conference “Deformation and destruction of materials with defects and dynamic phenomena in rocks and workings”. Tavria National University named after V.I.Vernadskyi, Simferopol, pp. 193–196.

Куринной В.П. Об уравнении адиабаты для продуктов детонации взрывчатых веществ: материалы XXII международной научной школы им. академика С.А.Христиановича „Деформация и разрушение материалов с дефектами и динамические явления в горных породах и выработках“ / В.П.Куринной, И.П.Гаркуша – Симферополь: Таврический нац. ун-т, 2012. – С. 193–196.

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