The experience of using the Kuz-Ram model in describing of grain size distribution of blasted rock mass

The article gives an analysis of probabilistic distributions used in mining practice, which describe the granulometric composition of the exploded rock mass. Experimental distributions of fractions of the exploded rock mass were obtained for the conditions of experimental blocks of an ore quarry using the WipFrag software product. The experimental data were compared with the predicted distributions according to the Kuz–Ram model. It is established that the parameters of the initiation of borehole charges affect the actual distribution of the granulated rock mass. Depending on the initiation scheme and deceleration ratings of the cut-in and echelon surface networks, the values of the line of least resistance and the distance between borehole charges during a mass explosion change. The analysis showed that taking into account the isochronous initiation of a mass explosion makes it possible to achieve a better agreement with the experimental grain composition distribution curves in terms of the uniformity of the distribution of pieces. A method for calibrating the Kuz–Ram model to describe the results of explosive rock destruction is proposed. The proposed approach takes into account the actual values of the line of least resistance and the distance between the borehole charges, formed taking into account the isochronous initiation (isoline simultaneity).

Marinin M. A., Afanasyev P. I., Sushkova V. I., Ustimenko K. D., Akhmetov A. R. The experience of using the Kuz-Ram model in describing of grain size distribution of blasted rock mass. MIAB. Mining Inf. Anal. Bull. 2023;(9-1):96-109. [In Russ]. DOI: 10.25018/0236_1493_2023_91_0_96.

M.A. Marinin¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: marinin_ma@pers.spmi.ru, ORCID ID: 0000-0002-5575-9343,
P.I. Afanasyev¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Afanasev_PI@pers.spmi.ru, ORCID ID: 0000-0001-5271-6121,
V.I. Sushkova¹, Leading Specialist, e-mail: Sushkova_VI@pers.spmi.ru,
K.D. Ustimenko¹, Research Student, e-mail: s201036@stud.spmi.ru,
A.R. Akhmetov¹, Research Student, e-mail: s201038@stud.spmi.ru,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

M.A. Marinin, e-mail: marinin_ma@pers.spmi.ru.

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