Table 5 Comparison of blasting effects.
Classification | Grade | Over-excavation area(m2) | Maximum over-excavation (m) | Half-hole residual rate(%) |
|---|---|---|---|---|
Conventional | III-level | 5.969 | 0.564 | 51 |
IV-level | 10.027 | 0.974 | 76 | |
Cumulative | III-level | 4.614 | 0.386 | 75 |
IV-level | 8.244 | 0.581 | 93 |
