Table 4 Design parameter table for full-section blasting of different surrounding rock (conventional design).
Rock mass classification | Name | Blasting number | Borehole depth(m) | Borehole spacing(m) | Delay interval(ms) |
|---|---|---|---|---|---|
III-level | Cut hole | 1–18 | 3.7 | 0.55 | 0 |
Auxiliary hole | 19–32 | 3.44 | 0.8 | 100 | |
33–46 | 3.36 | 0.8 | 200 | ||
47–58 | 3.27 | 0.8 | 300 | ||
59–63 | 3.27 | 1 | 300 | ||
64–73 | 3.21 | 0.8 | 400 | ||
74–80 | 3.21 | 1.1 | 400 | ||
81–102 | 3.2 | 1 | 500 | ||
103–123 | 3.2 | 0.6 | 500 | ||
Contour hole | 124–175 | 3.2 | 0.5 | 600 | |
Floor hole | 176–196 | 3.2 | 0.6 | 700 | |
IV-level | Cut hole | 1–14 | 3 | 0.6 | 0 |
Auxiliary hole | 15–26 | 2.82 | 0.8 | 100 | |
27–38 | 2.66 | 0.8 | 200 | ||
39–43 | 2.66 | 1.45 | 200 | ||
44–53 | 2.61 | 0.8 | 300 | ||
54–61 | 2.61 | 1.2 | 300 | ||
62–84 | 2.6 | 1 | 400 | ||
85–98 | 2.6 | 0.9 | 500 | ||
Contour hole | 99–156 | 2.6 | 0.45 | 500 | |
Floor hole | 157–171 | 2.6 | 0.9 | 600 |
