Research Article
Mechanical and Deformation Characteristics and Optimization of Support Parameters for Superlarge-Span Tunnel: A Case Study from Laohushan Tunnel
Table 6
Primary support internal force and material safety factor.
| Number | Position | Shotcrete axial force (kN) | Axial force of steel rib (kN) | Steel rib bending moment (kN·m) | Shotcrete safety factor | Steel rib tensile safety factor | Steel rib compression safety factor |
| 0 | Vault | 506.9 | 141.7 | −7.9 | 8.3 | 12.3 | 4.7 | 1 | Vault deviated left 30° | 1421.0 | 397.1 | −4.2 | 3.2 | | 3.8 | 2 | Vault deviated right 30° | 829.6 | 231.9 | −2.2 | 5.2 | | 6.8 | 3 | Left hance 60° | 1787.5 | 499.6 | −1.2 | 2.6 | 4.8 | 3.9 | 4 | Right hance 60° | 1042.7 | 291.4 | −8.0 | 4.2 | 74.7 | 3.5 | 5 | Left skewback | 1304.4 | 364.6 | −3.3 | 3.5 | | 4.3 | 6 | Right skewback | 760.4 | 212.5 | −12.0 | 5.6 | 8.0 | 3.1 | 7 | Left side wall | 183.7 | 51.3 | 5.4 | 22.1 | 12.9 | 8.0 | 8 | Right side wall | 15.6 | 4.4 | −0.1 | 256.6 | | 275.8 |
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