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

<div>Construction of upper bench CD method. (a) Field construction. (b) Three-dimensional schematic diagram.</div>

Advances in Civil Engineering

Figure 4: Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling 