When a shield tunnel is subjected to earthquakes and longitudinal deformation of the stratum, the segment ring may open along the longitudinal direction, thereby rendering the circumferential joint more vulnerable when being pulled. In this study, a self-made loading device was adapted to analyze the mechanical characteristics and failure process of a circumferential joint with a straight bolt in a large-section shield tunnel during the drawing process. The tensile performance was measured through tests with a 1:1 joint to study the behavior of the circumferential joint, including the strain distributions of steel fiber-reinforced concrete (SFRC) and reinforced concrete (RC), bolt stress distribution and transmission, structural acoustic emission (AE) and microscopic information of the segment concrete, and final failure mode of the joint under different load conditions. Results show during the drawing process, the circumferential joint with a straight bolt affects the stress distribution on the circumferential joint surface and the area of the hand hole on the inner surface of the segment; however, the circumferential joint has negligible effect on the outer surface of the segment. Although the straight bolt is always in a favorable working condition, segment failure is inevitable for both SFRC and RC segments. In addition, the damage zone expands mainly from the bolt hole on the joint surface to the hand hole on the inner surface. During the tensile process under cyclic loading and unloading conditions, the segment exhibits cumulative damage, and the Felicity effect can be verified using AE technology. In summary, the steel fibers improve the tensile strength and crack resistance of circumferential joints under high-strain conditions.

当盾构隧道遭受地震和地层的纵向变形时，扇形环可能会沿纵向方向打开，从而使周向接头在被拉动时更加脆弱。在这项研究中，采用了一种自制的加载装置，以分析拉拔过程中大截面盾构隧道中带直螺栓的周向接头的力学特性和破坏过程。通过使用1：1接头进行测试来测量拉伸性能，以研究圆周接头的性能，包括钢纤维增强混凝土（SFRC）和钢筋混凝土（RC）的应变分布，螺栓应力分布和传递，结构声学分段混凝土的发射（AE）和微观信息，以及在不同载荷条件下接头的最终失效模式。结果表明，在拉拔过程中，带直螺栓的环缝会影响环缝表面上的应力分布以及扇形内表面上的手孔区域。但是，圆周接头对扇形段的外表面的影响可忽略不计。尽管直螺栓始终处于良好的工作状态，但对于SFRC和RC扇形段而言，扇形段故障是不可避免的。另外，损伤区域主要从接合表面上的螺栓孔扩展到内表面上的手孔。在循环加载和卸载条件下的拉伸过程中，该段显示出累积损伤，并且可以使用AE技术验证Felicity效果。总之，