MODEL OF MECHANICAL BEHAVIOR WITH WHOLE SEGMENTAL LINING OF SHIELD TUNNEL

There is no universally applicable theory formula to characterize the inner contact of structural parameters of a shield lining structure at present. First, the “representative section” reflects bending stiffness of an entire ring lining structure was proposed, and an assembly mechanical model of a segmental ring with a sequence and staggered arrangement was built. Then the relation formulas for the effective ratio of bending rigidity and the transfer ratio of bending moment were derived by using the mechanical model. Finally, correctness of these formulas was verified. The study shows that the mechanical model can derive relation formulas for the effective ratio of bending rigidity, the bending moment transfer ratio of a segment body and a segment joint, and the parameters of a segment lining structure. The bending moment transfer ratio of a segment body may not equal the parameter of a segment joint, and this shows that the single value of a transfer ratio of bending moment is unscientific. A uniform rigidity ring model can also obtained the radial maximum shear parameter of a ring joint. We found that two intermediate parameters are very important, which similar to the circumferential and radial relative stiffness parameters of a lining structure. The parameter formulas proposed have an important value for the revealing inner mechanical nature of the entire ring lining structure of a shield tunnel.