Calculation of burden by the first row of blastholes in complex-structure rock mass blasting with regard to cracked zone radii

In quarrying construction materials, especially in excavation of granite for building purposes, subsoil users face the problem connected with high oversize amount generated in blasting of structurally complex rock masses. Such rock masses possess complex morphology and nonuniform block structure, and a blasting site can contain different type rocks with highly variable jointing. For another thing, granite itself can have differing properties, which even more complicates blasting and worsens uniformity of fragmentation. As a result of weakening of such complex-structure rock mass by energy of explosions, generation of oversize fractions is highly probable. Together with zones of unstable fragmentation and block detachment, oversize fragments are often generated in the region of the first row of blastholes. This article continues the research aimed at improved quality of rock fragmentation by blasting through introduction of structural peculiarities of rock mass into consideration. The article sets forth theoretical calculations, approaches and features of computation of burden by the first row of blastholes in blasting of structurally complex rock masses with regard to the change in the strength of rocks depending on the rate of their jointing, which, in its turn, influences the size of the cracked zones.

Isheisky V. A., Ryadinskii D. E., Magomedov G. S. Calculation of burden by the first row of blastholes in complex-structure rock mass blasting with regard to cracked zone radii. MIAB. Mining Inf. Anal. Bull. 2025;(3):64-79. [In Russ]. DOI: 10.25018/0236_1493_ 2025_3_0_64.

Ишейский Валентин Александрович¹ — канд. техн. наук, доцент, e-mail: Isheyskiy_VA@pers.spmi.ru, ORCID ID: 0000-0003-1007-6562,
Рядинский Даниил Эдуардович¹ — аспирант, e-mail: riadinskii.d@mail.ru, ORCID ID: 0000-0002-5765-1811,
Магомедов Гаджи Сиражудинович — генеральный директор, АО «Гавриловское карьероуправление», e-mail: aogku@yandex.ru,
¹ Санкт-Петербургский горный университет императрицы Екатерины II.

V.A. Isheisky, Isheyskiy_VA@pers.spmi.ru.

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