Research Article
Mechanical and Deformation Characteristics and Optimization of Support Parameters for Superlarge-Span Tunnel: A Case Study from Laohushan Tunnel
Table 8
Internal force and safety factor of primary support under parameter 1.
| Monitoring point | 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 | Crown | 511.8 | 104.2 | −7.4 | 9.3 | 2.6 | 2.0 | 1 | Crown deviated left 30° | 1472.9 | 299.8 | −3.9 | 3.5 | 16.4 | 2.5 | 2 | Crown deviated right 30° | 857.3 | 174.5 | −2.2 | 5.7 | 32.9 | 4.4 | 3 | Left haunch 60° | 1859.2 | 378.4 | −0.7 | 2.9 | | 3.9 | 4 | Right haunch 60° | 1080.6 | 219.9 | −1.7 | 4.6 | 50.4 | 4.4 | 5 | Left skewback | 1369.7 | 278.8 | −1.8 | 3.7 | | 3.8 | 6 | Right arch foot | 789.3 | 160.6 | −4.4 | 6.2 | 5.9 | 2.9 | 7 | Left side wall | 191.3 | 38.9 | 1.3 | 24.2 | 17.2 | 9.9 | 8 | Right side wall | 16.2 | 3.3 | 0.4 | 282.4 | 47.2 | 40.2 |
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