AUTOMATIC 3D RECONSTRUCTION OF HIGHWAY TUNNEL USING TERRESTRIAL LASER SCANNING TECHNOLOGY

摘要

Terrestrial laser scanning (TLS) technologies are now a viable option for augmenting highway tunnel inspections. Utilizing an integrated combination of a TLS and computer three-dimensional (3D) reconstruction can decrease costs, expedite inspections and facilitate highway tunnel access. In this paper, an automated and efficient method for reconstructing highway tunnel using terrestrial 3D laser scanning technology is presented. Any such inspection must consider the design of the TLS technology, the choice of laser scanners, data acquisition, geometrical resolution, and safety regulations. The G25 Highway Tizishan Tunnel in Jiangsu Province recently served as a test bed for a TLS inspection methodology that integrates these considerations. The end goal was to produce a three-dimensional (3D) model of the tunnel using TLS captured point clouds and a Poisson approach. To maximize the quality of the 3D model and its benefits to inspectors, this goal guided TLS task and mission planning. The resulting inspection methodology integrates TLS task, data capture and data analysis together to provide an optimized 3D model. This model provides inspection documentation while enabling the monitoring of defects. The developed methodology is presented herein, as well as analyses of the 3D models. The findings demonstrate that the TLS inspection methodology provided superior 3D models with the accuracy to resolve defects and support the needs of urban area managers.