预制拼装综合管廊承插式接头扭转力学性能

br />To research the torsional mechanical properties of precast utility tunnel bell and spigot joint,the three-dimensional model of soil and utility tunnel was established by ABAQUS software,the stress distribution of utility tunnel segment torsional deformation bell and spigot joint was analyzed,and the transverse ultimate differential settlement of bell and spigot joint and ultimate differential settlement were obtained.The results show that when the utility tunnel forward and reverse torsional settlement is the same,the bell and spigot joint of stress,maximum principal stress and shear stress distribution law is basically the same.The stress on the bell end wall is large but is small in the middle of the joint top and bottom plate and the axillary corner.The maximum principal stress is concentrated on the bell end side wall and the spigot top and bottom plate.The maximum principal stress at 1 m from top plate the side wall of the bell end to the outside is the largest.The joint shear stress is the smallest in the middle of the top and bottom plate and side wall,gradually increases to sides,and reaches the maximum shear stress at axillary corner.The bell and spigot joint transverse limit differential settlement is 1.2 mm,and there is little difference between the ultimate torque and the results calculated by using box section at the spigot joint; in engineering practice,the box section can be used for the spigot joint torsional design.The research results provide a scientific basis for the precast utility tunnel safe operation.