| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 107 === Taiwan is located at the boundary between the Philippine Sea Plate to the Eurasian Plate. Earthquakes and typhoons usually happen. These natural disasters cause hidden damages to the engineering structures. Therefore, the investigation and monitoring of structural stability is important. The investigation and monitoring can be carried out using traditional 3D Laser scanners, which can collect high-precision three-dimensional coordinate information of engineering structures. However, the method cost high. In this study, a small-scale lidar, the VLP-16 scanner, with a portable automatic lifting platform and conjugate spheres is used for 3D building reconstruction. The results from the VLP-16 scanner are compared with those from the traditional 3D Laser scanner, the VZ-1000.
In this thesis, the study area is located in the Henglingshan Tunnel. We analyze the deformation of the tunnel, discuss if the VLP16 scanner can meet the monitoring requirements, and understand the feasibility of the VLP16 scanner for tunnel monitoring. The results show that the accuracy of the VLP16 scanner is about 1mm~3mm, which can be used for tunnel deformation monitoring. However, the cracks of the tunnels are undetectable using the VLP16 scanner.
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