Research on Tunnel Construction Monitoring Method Based on 3D Laser Scanning Technology

A tunnel is a symmetric structure working under uncertain load. In the traditional method of monitoring and measurement deformation, only small number measuring point displacements are engaged to represent overall deformation tunnel, it difficult fully reflect displacement changes during construction process. this paper, proposed for process based on 3D laser scanning technology. Initially, was used obtain scattered clouds irregular structures considering New Austrian Tunneling Method (NATM). Afterward, modified B-spline interpolation greedy triangulation were fit surfaces. Moreover, normal vector matrix innovatively applied express fitting surface, which solved problem in scanning. obtained by intersection one fitted surface with other. Subsequently, maximum entropy introduced form probability density function vector, 1% 5% eigenvalues analyze trend tunnel. Finally, eigenvalue probability, less affected uncertainties, selected analysis. This way, analysis prediction established.