OPTIMIZATION OF DRILLING AND BLASTING PARAMETERS TAKING INTO ACCOUNT THE PHYSICAL AND MECHANICAL PROPERTIES OF ROCKS AND CHARACTERISTICS OF BLAST LOAD

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OPTIMIZATION OF DRILLING AND BLASTING PARAMETERS TAKING INTO ACCOUNT THE PHYSICAL AND MECHANICAL PROPERTIES OF ROCKS AND CHARACTERISTICS OF BLAST LOAD

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This article provides a detailed study of the physical and mechanical processes occurring during explosive crushing of rocks, with a special emphasis on the formation of cracks and changes in the granulometric composition of the massif. The main attention is paid to the influence of the blast loading parameters - the specific consumption of explosives (BC), charge diameter and line of least resistance (LLR) - on the average size and distribution of rock pieces. The distribution of the explosion energy for crushing, heat losses, seismic and impact effects, as well as the role of the energy transfer coefficient, depending on the physical and mechanical properties of the rock and the characteristics of the BC, are considered. The minimum and critical values of the specific consumption of BC, at which optimal crushing is achieved without excessive dust formation, are identified. Two characteristic zones of operation are described: at low specific consumptions, the crushing process is extremely sensitive to deviations in the design parameters, which complicates control, whereas at high specific consumptions, crushing becomes more stable and controllable. The analysis of the crushing uniformity index (n) shows that an increase in the LNS leads to an increase in the proportion of both large and small fractions, which can be useful for the processes of ball-free grinding and gravity concentration. The presented results contribute to the optimization of drilling and blasting operations, allowing to increase the efficiency of crushing, reduce costs and improve the quality of the final product.

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Teglar

# fractional composition# optimization of technological pr# drilling and blasting operations# Blasting crushing of rocks# specific consumption of explosiv# line of least resistance# particle size distribution# average size of pieces# crack formation# uniformity of crushing# crushing quality management

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https://eroi.uz/11.0008/A1125-0008

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Foydalanilgan adabiyotlar

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