地铁盾构隧道管片接头抗弯刚度的数值计算

采用三维有限元法对南京地铁区间盾构隧道管片接头的受力情况进行了数值模拟计算，研究了不同荷载作用下管片接头的变形、转角和抗弯刚度，探讨了接头转角和抗弯刚度的变化规律；通过转角、弯矩和轴力关系的拟合为接头抗弯刚度的确定提供了新的途径．数值计算结果表明，管片接头抗弯刚度随轴力增大而增大，随弯矩增大迅速减小并逐渐趋于稳定；轴力对抗弯刚度的影响随弯矩的增大而减小。

Numerical Simulation of Segment Joint Bending Stiffness of Metro Shield Tunnel

The numerical simulation of segment joints of Nanjing metro shield tunnel was carried out with 3D FEM (finite element method). The deformation, rotational angle and bending stiffness of a segment joint under different working conditions were investigated, and the varying law of rotational angle and bending stiffness were discussed. In addition, the fitting relation between rotational angle of a segment joint and bending moment and axial force was obtained to provide a new way of determining joint bending stiffness. The numerical result shows that the bending stiffness of segment joints increases with the increasing of axial force, and the bending stiffness decreases rapidly and trends unchanged with bending moment increasing. Influence of axial force on joint bending stiffness weakens with the increasing of bending moment.