Abstract: The lateral offset of the measuring tower top increases with increasing buried depth of immersed tunnel segment during segment sinking of ShenzhenZhongshan link. To investigate the measuring data abnormality of measuring tower top and further provide reference for decisionmaking of response to segment attitude, the threedimensional finite element modeling software is used to comprehensively analyze the deformation of segments and measuring tower during segment sinking under the actions of wind, sea wave, and waterflow. The results are compared with the monitoring data of immersed tunnel segment during sinking. The analytical results reveal that the flexure deformation of segment and the influence of sea tide are the main reasons for the offset of measuring tower top. Finally, corresponding solutions and suggestions are proposed to control the segment installation accuracy.

Key words: immersed tunnel, element installation, flexure deformation, measuring tower