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Let us calculate the change in the rate of detonation along the length of the charge at different angles of inclination of boreholes to establish a rational initial density of EE Ukrainit- PP-2B for when conducting stoping operations. We used a new method for calculating the magnitude of the change in the density of the EE along the charge length and the obtained formulas (11, 12). The calculation of the detonation velocity along the length of the charge column at different angles of the

Figure 5 Let us calculate the change in the rate of detonation along the length of the charge at different angles of inclination of boreholes to establish a rational initial density of EE Ukrainit- PP-2B for when conducting stoping operations. We used a new method for calculating the magnitude of the change in the density of the EE along the charge length and the obtained formulas (11, 12). The calculation of the detonation velocity along the length of the charge column at different angles of the

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Schemes of boreholes arrangement for ore breaking in the conditions of iron ore mines of Ukraine SSN 2071-2227, E-ISSN 2223-2362, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2021, N2 2
Schemes of boreholes arrangement for ore breaking in the conditions of iron ore mines of Ukraine SSN 2071-2227, E-ISSN 2223-2362, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2021, N2 2
Fig. 1. Calculation scheme for determining the density of EE by the length of the charge column in the descending (a) and ascending (b) charging cavities
Fig. 1. Calculation scheme for determining the density of EE by the length of the charge column in the descending (a) and ascending (b) charging cavities
The results of measuring the experimental detonation velocity EE Ukrainit-PP-2B
The results of measuring the experimental detonation velocity EE Ukrainit-PP-2B
Fig. 4. The result of measuring the detonation velocity of EE Ukrainit-PP-2B with a density of 1150 kg/m? with a charge diameter of 0.1 m, created by MicroTrap Software
Fig. 4. The result of measuring the detonation velocity of EE Ukrainit-PP-2B with a density of 1150 kg/m? with a charge diameter of 0.1 m, created by MicroTrap Software
Fig. 3. Scheme of the sensor-conductor arrangement in the test charge (a) and photofixation of the prepared series of charges before the experiment conducting (b)
Fig. 3. Scheme of the sensor-conductor arrangement in the test charge (a) and photofixation of the prepared series of charges before the experiment conducting (b)
Fig. 6. Diagram of change in the value of the detonation velocity of EE Ukrainit-PP-2B with an initial density of 800 (a), 950 (b) and 1100 (c) kg/m? and a charge diameter of 0.105 m Further examinations of the change in detonation velocity along the charge length at the initial density of EE Ukrainit- PP-2B of 950 kg/m? (Fig. 6, b), revealed that at an angle of inclination of the charge cavity @ = 0° the detonation velocity will be equal to 4750 m/s. At angles of inclination of the charg- ing cavity 0° < @ < 30° it will increase from 4750 to 5690 m/s. At angles of 30° < @ < 45°, the detonation velocity reaches a maximum value of 5700 m/s on the length of the charge col- umn up to 30 m and then decreases to 5550 m/s on 35 m length of the charge column. At angles of inclination of 45° < @ < 75°, at the length of the charge column up to 25 m, the detonation velocity reaches a maximum value of 5750 m/s, which de- creases to 5150 m/s at the length of the charge column of 35 m. At angles of inclination of 75° < @ < 90° at the length of the charge column up to 20 m, the detonation velocity will have a maximum value of 5700 m/s, which on the length of the charge column from 20 to 35 m will decrease to 5100 m/s.
Fig. 6. Diagram of change in the value of the detonation velocity of EE Ukrainit-PP-2B with an initial density of 800 (a), 950 (b) and 1100 (c) kg/m? and a charge diameter of 0.105 m Further examinations of the change in detonation velocity along the charge length at the initial density of EE Ukrainit- PP-2B of 950 kg/m? (Fig. 6, b), revealed that at an angle of inclination of the charge cavity @ = 0° the detonation velocity will be equal to 4750 m/s. At angles of inclination of the charg- ing cavity 0° < @ < 30° it will increase from 4750 to 5690 m/s. At angles of 30° < @ < 45°, the detonation velocity reaches a maximum value of 5700 m/s on the length of the charge col- umn up to 30 m and then decreases to 5550 m/s on 35 m length of the charge column. At angles of inclination of 45° < @ < 75°, at the length of the charge column up to 25 m, the detonation velocity reaches a maximum value of 5750 m/s, which de- creases to 5150 m/s at the length of the charge column of 35 m. At angles of inclination of 75° < @ < 90° at the length of the charge column up to 20 m, the detonation velocity will have a maximum value of 5700 m/s, which on the length of the charge column from 20 to 35 m will decrease to 5100 m/s.
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