科研之友
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摘要
The relationships between joint bending moments, axial force and rotating angle are established by using FEM analysis. An iterative algorithm is carried out incorporating the nonlinear joint parameters. The results calculated by the iterative algorithm are compared with those from different methods widely used in shield tunnel lining design, such as the modified routine method, the multi-hinge ring method and the beam-spring method. In addition, the results from different calculation models under different external loads are validated by large-scale similitude model test. The iterative algorithm is also applied to analyzing the segment lining structure in layered strata and verified by field test data. The study shows that the weakening effect of segment joints influences the segment ring integral performance. For structures under uniform loading, the results of the iterative algorithm are comparable with the results of beam-spring model with identical appropriate joint bending stiffness. For tunnels across multi-layered strata with widely different hardness, there is a great disparity in bending moments between the top and the bottom of lining. The results calculated by the iterative algorithm agree well with measured values.
- 出版日期2012
- 单位西南交通大学
