三维精细化数值模型有助于深入研究盾构隧道管片接头的力学性能，如何准确地将室内试验和数值模型的边界条件相对应是研究中的关键问题之一。在接头抗弯性能的研究中，轴力偏心距的影响不可忽视，以往研究大多对其进行理想化的处理，因此带来较大误差。针对管片接头压碎试验中轴力施加位置的不确定性进行探讨，证明了通过求解线性方程，并根据数值模拟和试验的偏差来确定初始轴力偏心距的可行性和合理性。并模拟出了管片接头在正负弯矩作用下变形至破坏的全过程，最后对正负弯矩作用下管片接头抗弯试验和三维有限元模拟提出建议。

Threedimensional accurate numerical model is favorable for the indeep study on the mechanical performance of segment joints. How to establish the relationship between the boundary conditions of the indoor experiments and those of the numerical models is one of the key factors to success. In the studies on the bending performance of segment joints, the influence of the axial force eccentricity cannot be ignored. In previous studies, idealized treatment is carried out, which resulted in big errors. In the paper, the uncertainty of the positions where the axial force is applied in the segment joint crushing experiment is discussed,  the feasibility and rationality to determine the axial force eccentricity in accordance with the deviation between the numerical simulation result and the experiment result and by means of regression analysis is verified,the whole process from the displacement of the segment joints to the failure of the segment joints  under the positive and negative bending moments is simulated, and finally some suggestion is made on the bending experiment and threedimensional numerical simulation of segment joints under positive and negative bending moments.