Research Article
Safety Threshold Determination for Blasting Vibration of the Lining in Existing Tunnels under Adjacent Tunnel Blasting
Table 2
The calculated parameters of each typical section.
| | Rock mass | Position | Distance from explosive source (m) | Blasting footage (m) | Cut holes number | Cutting holes charge (kg) |
| | Grade III | YK47 + 725 | 39.0 | 3 | 18 | 43.2 | | Grade IV | YK47 + 790 | 37.0 | 2 | 12 | 24 | | Grade V | ZK46 + 700 | 31.5 | 1.5 | 6 | 21 |
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