Abstract: The metro tunnel of Line 16 of Shanghai is a 10.4 mdiameter singletube shieldbored tunnel with separation wall,the interior of tunnel is separated by reinforced concrete wall panels.To ensure the safety of the separation walls, a regular, rapid, and full coverage monitoring method is required urgently.This article studies a moving-scanning monitoring method that can reflect the state of the separation wall through special relative tilt angle of the wall.It introduces the principles, methods, and theoretical model of the new monitoring technology for separation walls based on practical engineering cases. The accuracy of this method is estimated and verified through repeated scanning and total station testing. The results show that this method has good performance in quickly screening and locating with problem area of the separation wall. Also it has characteristics of high detection efficiency and high degree of automation, which can be referenced for tilt measurement of the separation wall in areas of traffic and municipal engineering.

Key words: separation wall, moving scanning, relative tilt angle, full coverage monitoring, rapid positioning