An Improved Numerical Model of Shield Tunnel with Double Lining and Its Applications

Table 9

The axial force extreme values under different thicknesses of secondary lining.

Thickness of secondary lining (cm)	10	20	30	40	50
Thickness of double lining (cm)	60	70	80	90	100
The increase ratio of double lining thickness	100%	117%	133%	150%	167%
The section of maximum axial force of the double lining
Axial force of double lining (MN)	−1.121	−1.121	−1.121	−1.120	−1.120
Axial force of segment lining at the corresponding section (MN)	−1.009	−0.897	−0.818	−0.762	−0.728
The allocation proportion of axial force of segment lining	90%	80%	73%	68%	65%
The increase ratio of axial force of double lining	100%	100%	100%	100%	100%
The section of minimum axial force of the double lining
Axial force of double lining (MN)	−1.058	−1.057	−1.057	−1.056	−1.056
Axial force of segment lining at the corresponding section (MN)	−0.963	−0.856	−0.772	−0.718	−0.686
The allocation proportion of axial force of segment lining	91%	81%	73%	68%	65%
The increase ratio of axial force of double lining	100%	100%	100%	100%	100%