Research Article
Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling
Table 4
Field monitoring sections.
| Lining type | Construction method | Stress monitoring section | Deformation monitoring section | Burial depth (m) | Clear distance (m) | Lithology | Number of buried elements |
| Shallow burial with grade V in tunnel portal | Upper bench CD method | YK2 + 133 | YK2 + 125 YK2 + 133 YK2 + 140 | 48 | 13.5 | Residual soil | 120 |
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