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 numberRange of regional spallingLoading step at elastic-plastic demarcation pointInternal force in the spalling regionMaximum axial force (kN)Maximum positive bending moment (kN·m)Maximum negative bending moment (kN·m)
Axial force (kN)Bending moment (kN·m)ValueLocationValueLocation

1None53128306.54250306.5Vault−220.2Right haunch
245°62714277.44292309.6Invert−200.8Right haunch
360°62386259.14033304.4Invert−191.3Right haunch
475°62082231.64012291.5Invert−200.2Left haunch