Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling

<div>Stress distribution of secondary lining concrete of YK2 + 133 section. (a) Maximum stress value of outside concrete. (b) Maximum stress value of inside concrete.</div>

Advances in Civil Engineering

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Figure 20

Figure 20: Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling 