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

Table 6

The bending moments extreme values under different thicknesses of segment lining.

Thickness of segment lining (cm)	30	40	50	60	70
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 bending moment of the double lining
Bending moment of double lining (kN·m)	131.047	142.037	148.896	151.945	152.454
Bending moment of segment lining at the corresponding section (kN·m)	63.178	97.604	120.650	133.701	140.300
The allocation proportion of bending moment of segment lining	48%	69%	81%	88%	92%
The increase ratio of bending moment of double lining	100%	108%	114%	116%	116%
The section of minimum bending moment of the double lining
Bending moment of double lining (kN·m)	−158.954	−171.705	−179.542	−182.704	−183.285
Bending moment of segment lining at the corresponding section (kN·m)	−77.292	−118.510	−145.771	−161.090	−168.780
The allocation proportion of bending moment of segment lining	49%	69%	81%	88%	92%
The increase ratio of bending moment of double lining	100%	108%	113%	115%	115%