Abstract The layout of segments in curved shield tunnel sections is directly related to the construction quality of shield tunnels, while a reasonable segment layout option is beneficial to the posture control of shield machines and can reduce the gap deviation between a shield tunnel and shield tail brushes. This paper puts forward a new analysis and calculation method as well as related calculation formulas for the layout of segments in horizontal curved shield tunnel sections, and summarizes the principles of segment layout in horizontal curved sections. In circular curved sections, the segment layout follows the principle that the average deflection angle of the combined segment ring groups should be close to the arc length deflection angle of corresponding length of the segment span. In transition curved sections, a deviation correction dedicated segment ring group should be inserted when the cumulative deflection angle in a transition curved section reaches the deflection angle of a deviation correction dedicated segment ring group
Abstract：
The layout of segments in curved shield tunnel sections is directly related to the construction quality of shield tunnels, while a reasonable segment layout option is beneficial to the posture control of shield machines and can reduce the gap deviation between a shield tunnel and shield tail brushes. This paper puts forward a new analysis and calculation method as well as related calculation formulas for the layout of segments in horizontal curved shield tunnel sections, and summarizes the principles of segment layout in horizontal curved sections. In circular curved sections, the segment layout follows the principle that the average deflection angle of the combined segment ring groups should be close to the arc length deflection angle of corresponding length of the segment span. In transition curved sections, a deviation correction dedicated segment ring group should be inserted when the cumulative deflection angle in a transition curved section reaches the deflection angle of a deviation correction dedicated segment ring group
2021, Vol. 58 