Research Article
A Comparative Study of Ground and Underground Vibrations Induced by Bench Blasting
Table 2
Vibration measurements taken in tunnel.
| Blast | Bench | , maximum charge by delay (kg) | , distance (m) | PPV (mm/s) | Frequency (Hz) |
| 1 | 628 | 174 | 313 | 0.7 | 14.6 |
| 2 | 628 | 175 | 102 | 15.1 | 31.1 | 175 | 132 | 14.3 | 32.3 | 175 | 172 | 6.3 | 32.3 |
| 3 | 628 | 175 | 262 | 1.3 | 32.9 | 175 | 217 | 2.1 | 33.9 | 175 | 141 | 5.2 | 32.9 | 175 | 120 | 3.1 | 32.3 |
| 4 | 628 | 175 | 107 | 15.0 | 32.9 | 175 | 144 | 4.7 | 32.9 | 175 | 186 | 5.8 | 32.9 |
| 5 | 628 | 175 | 335 | 2.3 | 31.7 | 175 | 228 | 2.1 | 32.9 | 175 | 207 | 6.3 | 32.9 |
| 6 | 628 | 173 | 267 | 1.6 | 30.5 |
| 7 | 628 | 175 | 205 | 6.2 | 16.5 | 175 | 132 | 4.3 | 31.7 | 175 | 141 | 7.6 | 33.6 |
| 8 | 628 | 175 | 259 | 1.5 | 29.9 | 175 | 211 | 5.4 | 33.6 |
| 9 | 628 | 175 | 236 | 2.9 | 34.3 | 175 | 154 | 3.9 | 35.4 |
| 10 | 628 | 175 | 176 | 4.5 | 35.4 |
| 11 | 616 | 175 | 140 | 5.1 | 35.4 | 175 | 127 | 15.9 | 33.5 |
| 12 | 628 | 175 | 175 | 3.8 | 35.4 | 175 | 171 | 3.2 | 33.6 |
| 13 | 628 | 173 | 104 | 3.9 | 62.0 | 173 | 252 | 7.1 | 33.6 |
| 14 | 616 | 174 | 141 | 5.7 | 32.3 | 174 | 108 | 6.2 | 35.0 | 174 | 95 | 13.5 | 33.6 |
| 15 | 628 | 175 | 202 | 4.8 | 34.2 |
| 16 | 628 | 173 | 230 | 5.5 | 61.0 | 173 | 107 | 24.5 | 88.8 | 173 | 99 | 12.5 | 95.2 |
| 17 | 628 | 175 | 194 | 3.9 | 34.2 |
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