Numerical Study on Bending Resistance of New Type Longitudinal Joint in Shield Tunnel
With the development of shield tunnels in the direction of large diameter and large buried depth,the bending performance requirements of tunnel longitudinal joints are increasing day by day.Therefore,many new types of joints have appeared.A new type of joint,including a new type of no-handhole connection structure,is studied and analyzed.Compared with the traditional longitudinal joint,the detail structure of the joint is changed,and the bolt position is adjusted.By establishing a three-dimensional refined finite element model of the new joint and the traditional joint,the bending behavior of the new longitudinal joint under positive and negative bending moments was compared and analyzed,and the influence of axial force was discussed.The results show that the bending process of the two longitudinal joints in different working conditions can be divided into linear sections and nonlinear sections.The increase in axial force will increase the damage to the compression zone and reduce the effect of connectors(bolts and new connection structures).Due to the change in distance from the bolt to the compression zone,the bending resistance of the new longitudinal joint under a positive bending moment is significantly improved compared with the traditional longitudinal joint.The bending resistance of the joint of the new connection structure is improved under the conditions of negative bending moment and small axial force,while the bending resistance of the new longitudinal joint is not obviously improved under the condition of large axial force.
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