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

<div>Stress distribution of steel rib in YK2 + 133 section. (a) Maximum value of outside steel rib. (b) Stability value of inside of stress rib.</div>

Advances in Civil Engineering

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Figure 13

Figure 13: Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling 