为研究盾构隧道环缝径向顺剪的抗剪性能，针对凹凸榫-斜螺栓形式的环缝，建立环缝径向顺剪抗剪刚度模型；将环缝的径向顺剪过程分解为静摩擦作用、螺栓锚固、螺栓弯曲变形以及凹凸榫咬合4个阶段，分析不同阶段环缝的受力特点及抗剪刚度的主要构成，并通过解析方法得到4个阶段抗剪刚度的显式解答。选取足尺环缝径向剪切试验的试验结果对螺栓作用阶段抗剪刚度理论模型进行验证并分析误差来源，结果表明，由于螺栓的装配方式、环缝剪切试验中结构的受力变形原理等因素，理论模型与试验结果存在差异，但变形阶段存在一定的相似性，理论模型能够较正确地描述环缝剪切过程中螺栓的力学行为。选取带榫管片环缝剪切试验对分布式凹凸榫在咬合阶段的抗剪刚度进行验证，结果表明，当纵向力较大时（达到2 000 kN），凹凸榫抗剪刚度的试验结果与理论模型计算结果接近，说明该模型能够较准确地描述在纵向力较大的情况下环缝剪切过程中凹凸榫的力学行为。
To investigate the radial shear along the shear
direction of the circumferential joint in shield tunnels, a radial shear
stiffness calculation model based on concaveconvex tenons and diagonal
bolts is established. The development of radial shear along the shear direction
in the circumferential joint is analyzed in four stages: static friction, bolt
anchoring, bolt bending, and concaveconvex tenon
occlusion. The mechanical characteristics and main components of shear
stiffness of the circumferential joint in each stage are analyzed using an
analytical method. By comparing experimental data with theoretical model
results, it is found that: The differences in bolt assembly methods and
deformation mechanisms of the structure lead to differences between the
theoretical model and test results； During the
deformation stage, the results are similar, indicating that the calculation
model is capable of accurately describing the shear characteristics of the
circumferential joint in the shear process. The experimental data of the
loading test of the tenoned segment is compared with the theoretical model. The
results indicate that when the longitudinal force reaches 2 000 kN, the
experimental results of the shear stiffness of concaveconvex
tenon are close to the theoretical model calculation results, which indicates
that the theoretical model can accurately describe the mechanical behavior of
tenons in the process of shearing under the condition of large longitudinal
force.
