Justification of blasthole expansion parameters in ring blasting

Hard rock drilling is a key process influencing productivity, cost and efficiency in mining. This article presents the design model to assess coverage of a couple of differently oriented elongated blastholes. In the design of blastholes in a ring, the angles from blasthole ends to the observation point were determined graphically for each couple of blastholes. The PPV values were determined under the action of dynamic compressive stresses for each couple of blastholes in the ring, and the parameters of cavity expansion in blastholes were found. For analyzing expansion of blastholes versus the ring pattern, the drill pattern design of spaced blastholes rings is estimated. The total mass of explosive charge in the expanded blasthole in blasting of odd-numbered holes is 3 times higher than in blasting of even-numbered holes. In determination of expansion parameters for blastholes, the emphasis was laid on the ring pattern geometry, namely, on the angle between the blasthole line and the ray plotted to the observation point from the hole bottom. It is found that expansion of blastholes in rings allows an essential reduction in meterage drilled.

 

Acknowledgements:
For citation:

Yegemberdiyev R. I., Ugolnikov N. V., Yusupov Kh. A., Stolpovskikh I. N. Justification of blasthole expansion parameters in ring blasting. MIAB. Mining Inf. Anal. Bull. 2019;(11):48-58. [In Russ]. DOI: 10.25018/0236-1493-2019-11-0-48-58

Issue number: 11
Year: 2019
Page number: 48-58
ISBN: 0236-1493
UDK: 622.24.051
DOI: 10.25018/0236-1493-2019-11-0-48-58
Authors: Yegemberdiyev R. I., Ugolnikov N. V., Yusupov Kh. A., Stolpovskikh I. N.
About authors:

R.I. Yegemberdiyev1, Doctoral Candidate, e-mail: ryegemberdiyev@borusan.com,
N.V. Ugolnikov, Cand. Sci. (Eng.), Assistant Professor, e-mail: ugkit@mail.ru,
G.I. Nosov Magnitogorsk State Technical University,
455000, Magnitogorsk, Russia,
Kh.A. Yusupov1, Dr. Sci. (Eng.), Professor,
I.N. Stolpovskikh1, Dr. Sci. (Eng.), Professor,
1 Satbayev University, 050013, Almaty, Kazakhstan.

Keywords: Underground mining, blasthole rings, blasthole expansion, critical PPV, equivalent reduced distance.
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