管片错台对盾构隧道接头 力学性能的影响机理

为分析管片错台对隧道结构受力性能影响。本文以某越江地铁盾构工程为依托，建立了管片接头三维精细化数值分析模型，结合等效荷载施加方式，重点分析了管片不同错台状态下接头螺栓、管片接触面的受力演变规律，揭示了管片错台对对盾构隧道接头力学性能的影响机理，得出的主要结论有：随着错台量的增大，接头螺栓与螺栓孔间接触关系发生连续改变，影响接头螺栓受力性能；错台量越大、接头螺栓受力越大，受力集中部位从螺栓中部向螺栓两端转移，且接头螺栓所受剪应力明显增加；随着管片错台量的增大，管片接缝面混凝土实际应力发生了重分布，受力较大区域均向螺栓孔处汇集，最大、最小主应力极大值均处于螺栓孔内壁处。研究成果为盾构管片结构设计及整体安全性分析具有重要借鉴作用。

Influence Mechanism of Segment Dislocation on Mechanical Properties of Shield Tunnel Joints

This study analyzes the influence of segment dislocation on the mechanical performance of tunnel structure. Based on the shield project of a certain river subway, a three-dimensional fine numerical analysis model of the segment joint is set up, and a combination of equivalent loading methods, joint bolts under different segment dislocations, and the law of force evolution of the segment contact surface are analyzed. The influence mechanism of segment dislocation on the mechanical properties of shield tunnel joints is revealed. The main conclusions are as follows: the contact relationship between the joint bolt and the bolt hole changes continuously with the increase in the segment dislocation volume, and the force performance of the joint bolt is affected; the larger the segment dislocation volume and the greater the force of the joint bolt, the more the location of the stress concentration shifts from the middle to the ends of the bolts, and the greater the shear stress of the joint bolts; the actual stress of the concrete on the joint surface is redistributed with the increase in the segment dislocation volume. A larger area of stress is formed at the bolt hole, and the maximum and minimum principal stresses are located at the inner wall of the bolt hole. The research results provide an important reference for shield segment structural design and overall safety analysis.