Research Article
Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Table 7
Main results of Schemes 11–15 at the 50th day.
| Scheme no. | Deformations | Plastic volume (m3) | Maximum forces | Working status of support members | Roof (mm) | Side wall (mm) | Floor (mm) | Arch axial force (kN) | Arch bending moment (kN) | Bolt axial force (kN) | Arch | Bolt |
| 11 | 168.2 | 172 | 247.5 | 84.8 | 640.2 | 66.5 | 260 | Normal | Normal | 12 | 188.5 | 207.4 | 252.6 | 90.8 | 440.8 | 66.1 | 171.8 | Failed | Normal | 13 | 125.2 | 132.0 | 238.6 | 75.1 | 2105 | 39.5 | 260 | Normal | Normal | 14 | 270.0 | 399.1 | 337.9 | 111.6 | 345.5 | 91.4 | 260 | Failed | 8 bolts are broken | 15 | 182.4 | 179.0 | 253.2 | 91.4 | 1184 | 48.3 | 260 | Failed | Normal |
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