Research Article
Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments
Table 9
Statistics of the internal force features in elastic-plastic demarcation point.
| Group number | Range of regional spalling | Loading step at elastic-plastic demarcation point | Internal force in the spalling region | Maximum axial force (kN) | Maximum positive bending moment (kN·m) | Maximum negative bending moment (kN·m) | Axial force (kN) | Bending moment (kN·m) | Value | Location | Value | Location |
| 1 | None | 5 | 3128 | 306.5 | 4250 | 306.5 | Vault | −220.2 | Right haunch | 2 | 45° | 6 | 2714 | 277.4 | 4292 | 309.6 | Invert | −200.8 | Right haunch | 3 | 60° | 6 | 2386 | 259.1 | 4033 | 304.4 | Invert | −191.3 | Right haunch | 4 | 75° | 6 | 2082 | 231.6 | 4012 | 291.5 | Invert | −200.2 | Left haunch |
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