Force Transmission Performance between Socket-Type Segments Rings of Large-Diameter Shield Tunnel Based on Full-Scale Bending Moment Transfer Tests

［Objective］ Since the mechanical properties and force transmission performance between rings of the large-diameter shield tunnel joints using double-row connectors are more complicated, it is necessary to carry out full-scale bending moment transfer tests on the staggered socket-type segments with double-row quick connectors, and to study the mechanical properties of new type joint in large-diameter shield tunnels. ［Method］ Based on a large-diameter shield tunnel project, full-scale bending moment transfer tests are conducted on socket-type segments in a large shield tunnel. The force transmission performance between segment rings with double-row quick connectors is investigated, and important design parameters such as the bending moment transfer coefficient are obtained. The force performance development law of the new type joint is analyzed, and the longitudinal force transmission mechanism of the tunnel with new type joints is explored, and the influencing factors are analyzed. ［Result & Conclusion］ The bending moment transfer effect of the pipe segment adopting new joints is better, the longitudinal joint angular stiffness of the staggered assembly method is improved, and the bearing capacity of the pipe segment body is fully utilized; with the increase of external load, the bending moment transfer effect changes continuously, and the bending moment transfer coefficient is a value changing continuously with the external load; with the increase of tunnel longitudinal force, the moment transfer effect is somewhat strengthened, and the influence of the longitudinal force on the moment transfer coefficient is basically linearly positively correlated. With the continuous increase of tunnel longitudinal force, the angular stiffness of the longitudinal joint increases, and the angular stiffness and the longitudinal force are basically linearly positively correlated.