Abstract
The bending moment of tunnel lining can be influenced by non-uniform ground pressures and joint eccentricities. Influence of joint interaction that induces flexural moment behaviour in segmental tunnel lining was investigated for the project Circle Line Stage 3 (C852), Serangoon Interchange Station. By considering behaviour of segment joint (which can affects the tunnel circumferential and longitudinal safety in overall), the tunnel lining behaviour and displacement of the ground surrounding the tunnel were evaluated. The segment joint modelling in simplified dual-jointed model and in fully soil-tunnel model were developed to assess the effect of segment joint on the overall tunnel response. Ground deformation or settlement trough at the ground surface resulted from the effect of tunnel construction and interaction between soil, tunnel, segment joints and ring joints was predicted. Results showed that with different use of segment joints give different longitudinal settlement. Hinge-nonlinear model together with separated rings model lead to the highest resemblance of surface settlement pattern to the field data when compare to tie model.
Highlights
The bending moment of tunnel lining can be influenced by non-uniform ground pressures and joint eccentricities
Results were mainly discussed the findings of segment joint modelling in simplified dualjointed model and fully soil-tunnel model behavior
Hinge with nonlinear angular joint stiffness properties (H-NL) showing the closest moment response in dual-jointed segments in which it was later selected to be adopted in the soil-tunnel model
Summary
The bending moment of tunnel lining can be influenced by non-uniform ground pressures and joint eccentricities. On the other hand, staggered joint lining with larger number of ring types, i.e., have smaller difference in the reference angles between successive rings will caused to a significant decrease of induced bending moment in lining [9]. Do et al [9] reported in their parametric studies of joint pattern effect; the continuous lining and straight joint segmental tunnel lead to similar structural forces in successive rings. Some other studies have suggested that segmental joints can be directly added to the tunnel lining structure [9,10,12,13,14,17] by considering the continuous ring with reduced rigidity (applying a reduction factor to the bending rigidity of the actual tunnel lining). Fig. 1. 3D model of soil-tunnel system with respective boundary condition and meshing 4
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