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盾构隧道管片环纵向接头构造复杂,偏压荷载作用下,其变形具有明显的非线性特征,合理的接头抗弯刚度值是运用梁–弹簧模型进行盾构隧道管片环断面设计、计算的前提,而该抗弯刚度值与接头截面处内力组合情况密切相关。针对双衬垫式管片环纵向接头,利用已有简化力学模型,提出一定轴压作用下,接头各变形模式及各模式下的抗弯刚度解析式,并将已有管片接头各工况加载试验的转角实测值与对应变形模式的理论计算值进行对比,验证了其工程设计适用性。根据接头各变形模式下抗弯刚度解析式,结合基于梁–弹簧模型考虑接头刚度差异性的管片环内各纵向接头处截面内力解析式,构造关于管片环内各纵向接头抗弯刚度值的非线性方程组,由数值计算软件Maple编写该接头刚度非线性方程组的不动点迭代求解程序,多次试算最终得到合理的管片环内各纵向接头抗弯刚度值。
The longitudinal joints of the shield tunnel segment ring are complex, and the deformation has obvious nonlinear characteristics under the bias load. The reasonable joint flexural rigidity value is to design the shield-tunnel segment ring section by using the beam-spring model Of the premise, and the bending stiffness value is closely related to the combination of internal forces at the joint section. Aiming at the longitudinal joint of the double shrouded segment ring, the existing simplified mechanical model was used to analyze the deformation modes and the flexural rigidity of the joints under a certain axial pressure. Compared with the theoretical calculation of the corresponding deformation mode, the experimental results show that the engineering design applicability is validated. According to the analytic formula of flexural rigidity under different deformation mode of joint and the analytical formula of internal force of section at each longitudinal joint of the segment ring based on beam-spring model considering the difference of joint stiffness, Of the nonlinear equations, the numerical calculation software Maple prepared the joint stiffness of the nonlinear equations iterative solution of iterative procedures, multiple trial and finally get a reasonable section of the longitudinal radius of the pipe joints bending stiffness values.