基于三维接触有限元分析的管片等效抗弯刚度和错台研究

针对盾构隧道管片接头等效抗弯刚度预测研究中，对梁-弹簧与三维模型整体等效性考虑的不充分，以三维接触有限元计算结果作为测量信息，借助基于挠度等效的反问题求解，提出了一种确定管片接头等效抗弯刚度的新方法；并利用不同轴力-偏心距组合下的反演结果，建立了基于Kriging代理模型的轴力-弯矩-等效抗弯刚度的非线性关系，提出了由此关联的管片结构非线性问题的数值求解方法。与三维有限元结果相比，所提方法可较为准确地预测管片结构的内力和变形，表现出良好的整体等效性。此外，借助三维接触有限元分析，进一步深入探讨了螺栓孔间隙与衬垫本构关系对管片纵向错台量的影响。

Investigation on the equivalent flexural rigidity and the longitudinal dislocation of segment joint based on 3D contact finite element analysis

Regarding the insufficient consideration of on overall equivalency between the 3D-model and equivalent beam-spring model for the segment joint of a shield funnelling machine,a new method is proposed to evaluate the equivalent flexural rigidity by solving a deflection equivalence based inverse problem,in which the result of 3D contact FE simulation is taken as an alternative of experiment.A Kriging surrogate model is constructed to describe the nonlinear relationship between the equivalent flexural rigidity and internal force,and is employed to develop a numerical algorithm for the structural analysis of the segment-joint with nonlinear joint flexural rigidity.In comparison with 3D FE simulation,the proposed method can effectively predict the internal force and deformation in the view on a whole.In addition,a deeper investigation is given to the impacts of the bolt hole clearance and liner constitutive model on the longitudinal dislocation of the segment joint via the 3D contact FE simulation.