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.
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.
| № | Author name | position | Name of organisation |
|---|---|---|---|
| 1 | Ochilov S. . | DSc | University of Geological Sciences, Tashkent city, Republic of Uzbekistan |
| № | Name of reference |
|---|---|
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