Abstract:

The total station scanner is used to scan the railway tunnel in the mining area. Based on the precision analysis of the scanning method of the liner-resection station, the deformation of arch tunnel is studied. And a method for fast extraction of the cross section is proposed through the arch axis of the arch tunnel. The method is based on the elevation difference to acquire the arch point sets. Then the random sampling consensus is used to process the sets and the arch axis is fitted by processed sets. The direction of the arch axis is taken as the normal direction of the cross section to achieve the fast extraction of the cross-section point sets and the cross-section contours are acquired based on the cross-section point sets to calculate the deformation. Finally, the point cloud data from scanner are used for testing and deformation analysis. The results show that the method can quickly extract the cross section of railway tunnel and the deformation can be reflected by the extracted cross-section.

Key words: total station scanner, tunnel deformation, fast extraction of cross section, arch axis