Research Article
Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Table 3
Geometry and mechanical parameters of the supporting arches.
| | Cross-section type | Cross section area (m2) | Equivalent inertial moment (mm4) | Equivalent elastic module (Pa) | Compression-bending failure criteria (m-n formulas) |
| | CFST square cross section 150 mm × 8 mm, concrete grade C40 | 0.0225 | 4218.75 | 0.05 × 1011 | Nu = 2526 kN, Mu = 101.7 kN·m | | U36 | 0.004569 | 9.29 × 106 | 2.06 × 1011 | Nu = 1457.6 kN, Mu = 48.3 kN·m |
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