Research Article
Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Table 5
Main results of Schemes 6–10 (time 50 d).
| | Scheme no. | Displacement | 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 | Rock bolt |
| | 6 | 78.0 | 125.1 | 71.5 | 88.1 | 1140.0 | 87.05 | 171.8 | Normal | Normal | | 7 | 77.0 | 127.7 | 94.9 | 60.8 | 1321.0 | 85.45 | 171.8 | Normal | Normal | | 8 | 107.2 | 155.0 | 136.2 | 72.1 | 824.4 | 73.77 | 171.8 | Failed | Normal | | 9 | 142.1 | 173.3 | 188.9 | 82.2 | 572.6 | 42.54 | 171.8 | Failed | Normal | | 10 | 189.9 | 213.6 | 252.8 | 91.4 | 443.4 | 66.46 | 171.8 | Failed | 2 bolts broken on the side walls |
|
|
