Research Article
Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel
Table 3
Relevant safety criteria for tunnel lining structures [
32].
| Structure type | Allowable safety peak particle velocity/cm/s | 1 d ≤ CA ≤ 3 d | 3 d ≤ CA ≤ 7 d | 7 d ≤ CA ≤ 28 d |
| Concrete | 1.2 | 1.2~5.0 | 5.0~7.0 | Shot concrete | 5.0 | Grouting | 1 | 1.5 | 2~2.5 | Bolts and anchor cables | 1 | 1.5 | 5~7 |
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