Research Article
Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel
| (1) Conventional blasting parameters | No. | Blasthole type | Period | Initiation time (ms) | Number of blastholes | Charging coefficient | Quality per hole (kg) | Total quality (kg) |
| 1 | Cut holes | 1 | 0 | 6 | 0.55 | 0.5 | 3.0 | 2 | Auxiliary holes | 3 | 50 | 15 | 0.5 | 0.5 | 7.5 | 3 | Auxiliary holes | 5 | 110 | 16 | 0.5 | 0.5 | 8.0 | 4 | Bottom holes | 6 | 150 | 6 | 0.25 | 0.2 | 1.2 | 5 | Bottom holes | 6 | 150 | 9 | 0.25 | 0.2 | 1.8 | 6 | Periphery holes | 7 | 200 | 27 | 0.25 | 0.2 | 5.4 | 7 | Total | | | 79 | | | 26.9 | (2) shock absorption blasting parameters | 1 | Cut holes | 1 | 0 | 3 | 0.55 | 0.5 | 1.5 | 2 | Cut holes | 2 | 5 | 3 | 0.55 | 0.5 | 1.5 | 3 | Auxiliary holes | 3 | 22 | 8 | 0.5 | 0.5 | 4.0 | 4 | Auxiliary holes | 4 | 39 | 7 | 0.5 | 0.5 | 3.5 | 5 | Auxiliary holes | 5 | 56 | 8 | 0.5 | 0.5 | 4.0 | 6 | Auxiliary holes | 6 | 73 | 8 | 0.5 | 0.5 | 4 | 7 | Bottom holes | 5 | 56 | 3 | 0.25 | 0.2 | 0.6 | 8 | Bottom holes | 6 | 73 | 3 | 0.25 | 0.2 | 0.6 | 9 | Bottom holes | 7 | 90 | 5 | 0.25 | 0.2 | 1.0 | 10 | Bottom holes | 8 | 107 | 4 | 0.25 | 0.2 | 0.8 | 11 | Periphery holes | 7 | 90 | 14 | 0.25 | 0.2 | 2.8 | 12 | Periphery holes | 8 | 107 | 13 | 0.25 | 0.2 | 2.6 | 13 | Total | | | 79 | | | 26.9 |
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