Research Article
Application of the Upper-Bench CD Method in Super Large-Span and Shallow Tunnel: A Case Study of Letuan Tunnel
Table 5
Maximum internal force of initial support.
| Construction method | Axial force | Bending moment | Maximum (kN) | Position | Maximum (kN·m) | Position |
| Upper-bench CD method | 2000 | Right side of vault | 105 | Right arch foot | CD method | 2180 | Right arch waist | 162 | Right foot | CRD method | 1970 | Left arch foot | 69 | Left foot | Both-side drift method | 1700 | Right arch waist | 143 | Left foot | Field test | 1967 | Left arch foot | 11.7 | Left foot |
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