Force and Deformation Characteristics during the Reconstruction and Expansion of Shallow Single-Tube Tunnels into Large-Span Multiarch Tunnels

<div>Time history curves of initial support stresses of the right tunnel tube: (a) after the excavation of the right tunnel tube; (b) after the excavation of the left tunnel tube.</div>

Advances in Materials Science and Engineering

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Figure 10

Figure 10: Force and Deformation Characteristics during the Reconstruction and Expansion of Shallow Single-Tube Tunnels into Large-Span Multiarch Tunnels 

Figure 10 | Force and Deformation Characteristics during the Reconstruction and Expansion of Shallow Single-Tube Tunnels into Large-Span Multiarch Tunnels 