Modified Profile-Image Method for Tunnel Lining Inspection
Date Issued
2011
Date
2011
Author(s)
Chen, Chia-Hui
Abstract
Tunnel linings deform with surrounding pressure. The amount of deformation would indicate whether or not the tunnels under investigation are considered dangerous.
Photogrammetry, a non-contact surveying technology, together with multi-line laser-marker provides images with clear tunnel profiles and strong geometric constraints for measuring tunnel linings in a very convenient, efficient as well as reliable way. The focus on this study is to integrate photogrammetric imaging geometry with laser profile through adjustment procedures. It is found that the modified profile-image method, as compared to pre-developed approach, field work can be less costly and mapping tunnel linings can be less time consumed while preserving the 3-D tunnel lining surveying quality. In addition, the methodology proposed allows the accuracy assessment at the plan stage taking surveying tools and scene of tunnel into consideration. The experiments show that the proposed approach is superior to its counterparts in rendering satisfactory geometric quality and providing pre-work assessment and smooth processing upon data acquisition.
Photogrammetry, a non-contact surveying technology, together with multi-line laser-marker provides images with clear tunnel profiles and strong geometric constraints for measuring tunnel linings in a very convenient, efficient as well as reliable way. The focus on this study is to integrate photogrammetric imaging geometry with laser profile through adjustment procedures. It is found that the modified profile-image method, as compared to pre-developed approach, field work can be less costly and mapping tunnel linings can be less time consumed while preserving the 3-D tunnel lining surveying quality. In addition, the methodology proposed allows the accuracy assessment at the plan stage taking surveying tools and scene of tunnel into consideration. The experiments show that the proposed approach is superior to its counterparts in rendering satisfactory geometric quality and providing pre-work assessment and smooth processing upon data acquisition.
Subjects
Tunnel Profile
Photogrammetry
Laser-Maker
Profile-Image Method
Type
thesis
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