Research Article
Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Table 4
Main results of schemes 1–5 (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 |
| | 1 | 5.7 | 6.2 | 6.9 | 13.6 | 101.4 | 2.60 | 124.9 | Normal | Normal | | 2 | 22.7 | 29.4 | 28.5 | 31.2 | 417.2 | 9.92 | 171.8 | Normal | Normal | | 3 | 107.2 | 155.0 | 136.2 | 72.1 | 824.4 | 73.77 | 171.8 | Failed | Normal | | 4 | 370.0 | 608.1 | 379.2 | 136.4 | 521.3 | 53.11 | 171.8 | Failed | Broken except the one on the foots | | 5 | 339.1 | 494.5 | 482.4 | 110.4 | 308.0 | 97.01 | 171.8 | Failed | Broken except the one on the foots |
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