Research on Damage of Ring-Joint Tenon of Uplift-Movement Shield Tunnel Caused by Extrusion of Shield Tail
During the construction process of shield tunnels,uplift-movement issues may occur,leading to partial squeezing of the segments at the tail of the shield machine and causing damage to the protruding tenons of the segment joints.The damaged protruding tenons become vulnerable areas in service for shield tunnels,increasing the likelihood of occurrence of tunnel defects such as leakage through segment joints.In this study,an 11-ring shield tunnel three-dimensional finite element model was established to analyze the destructive effects of the tail squeezing position and the degree of tunnel uplift-movement on the protruding tenons of the segment joints.The research findings are as follows:(1)the more severe the tunnel uplift-movement,the greater the deformation of the tunnel structure caused by the tail squeezing,and the maximum normal contact stress of the protruding tenons of the segment joints shows an increasing trend.(2)The closer the tail squeezing position is to the segment joints,the greater the deformation difference between adjacent rings of the tunnel,and the faster the increase rate of the normal contact stress of the protruding tenons of the segment joints.(3)When the tunnel uplift-movement is relatively small,there is no damage to the protruding tenons of the segment joints.However,as the tunnel uplift-movement increases,the tensile damage factor of the protruding tenons of the segment joints also increases.
NETL
NSTL
万方数据
维普
