Research Article
Numerical Study on the Mechanism and Application of Artificial Free Surfaces in Bedrock Blasting of Shield Tunnels
Table 5
Bedrock blasting parameters.
| | Thickness of the bedrock (m) | Depth (m) | Pitch row (m) | Row spacing (m) | Hole depth (m) | Unit consumption (kg/m3) | Charging mass (kg) | Charge structure |
| | 2 | 0.8 | 0.8 | 0.8 | 2.8 | 1.8 | 4.3 | Continuous | | 3 | 1 | 0.8 | 0.8 | 4 | 1.9 | 7.6 | Interval | | 5 | 1.5 | 0.8 | 0.8 | 6.5 | 2.1 | 10.3 | Interval |
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