Abstract:

The traditional tunnel monitoring methods have disadvantages such as large workload, low efficiency and little quantity of data collected. The tunnel safety and quality information can be integrated, accurate 3D vector model of tunnel can be established and the integral deformation and contour of the tunnel can be obtained by using 3D laser scanning technology. The application of 3D laser scanning technology to deformation control of Tonglu Tunnel is studied. Some conclusions are drawn as follows: 1) The scanning error increases sharply when the incident angle is larger than 60°. The maximum distance of adjacent monitoring stations depends on scanning incident angle and tunnel diameter. 2) The dual points control technology should be adopted so as to reduce the overall deviation induced by cumulative tunnel registration errors. 3) The accuracy of monitoring data can be improved by using single point domain analysis method. 4) The tunnel deformation, support structure interference and thickness of secondary lining can be detected quickly and the data collection and analysis efficiency of tunnel can be improved greatly by using point cloud and model socket technology.

Key words: tunnel constructed by mining method, 3D laser scanning technology, deformation monitoring, point cloud, dual points control technology