Table 1 Drilling and charging parameters for secondary expansion blasting site for high voltage cable Shafts.
From: Control effects of joint grouting and precision blasting on blasting damage in deep rock masses
Blast hole | Detonator segments | Borehole Diameter (mm) | Borehole Depth (cm) | borehole spacing (mm) | Charge Length (cm) | Single Hole Charge Quantity (kg) | Linear Density (kg/m) |
|---|---|---|---|---|---|---|---|
Breaking Hole | MS1 | 42 | 350 | 840 | 280 | 2.1 | 0.6 |
MS3 | 42 | 350 | 886 | 280 | 2.1 | 0.6 | |
MS5 | 42 | 350 | 911 | 280 | 2.1 | 0.6 | |
Peripheral Hole | MS7 | 42 | 350 | 500 | 280 | 0.7 | 0.2 |
