Research Article
Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Table 6
The numerical schemes for enhanced support.
| Scheme no. | Parameters of roadway | Support type and parameters | Vertical ground stress (MPa) | Lateral ground stress coefficient λ |
| 11 | The same as Schemes 1∼10 | CFST arch + Φ22 mm bolts | 10 | 1.5 | 12 | CFST arch + Φ18 mm bolts + energy-absorbing bolts on the side walls | 10 | 1.5 | 13 | CFST arch + Φ22 mm bolts + locking bolts | 10 | 1.5 | 14 | CFST arch + Φ22 mm bolts + locking bolts | 15 | 1.0 | 15 | U36 arch + Φ22 mm bolts + locking bolts | 10 | 1.5 |
|
|