Abstract:Tunnel boring machine (TBM) has been widely applied in tunnel construction. The deformation of tunnel is one of the major concerns in TBM construction project. Major deformation may cause tunnel landslide or TBM jam, influence the construction schedule and threaten the safety of the constructors. A tunnel deformation monitoring system based on vision assistant in TBM construction is proposed. Artificial target points are designed by using fluorescent coating. Targets are detected by

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... ng monocular vision and aimed by using a Pan-tilt platform. The three-dimensional coordinates of the targets are obtained based on the principal of polar coordinates of the Pan-tilt platform using laser distance measurement. The efficiency of measuring is further improved by using a binocular vision system assistant measurement based on semi-definite programming method. Experiments show the precision of the system can be up to 1mm with good efficiency.