Full-Section Deformation Monitoring of High-Altitude Fault Tunnels Based on Three-Dimensional Laser Scanning Technology
Author:
Tan Dongmei1, Tao Yu1, Ji Baifeng12ORCID, Gan Qinlin1, Guo Tai1
Affiliation:
1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China 2. Sanya Science and Education Lnnovation Park, Wuhan University of Technology, Sanya 572000, China
Abstract
In traditional tunnel monitoring, the characteristic points of an object within a tunnel are measured to obtain information about the object. Considering the limitations of the traditional method in measuring the complex surface structure of tunnels, such as limited monitoring points, a long measurement period, and low precision, this study introduces an approach that uses three-dimensional (3D) laser scanning for monitoring tunnel cross-section deformation. Using this approach, the soft surrounding rock of a high-altitude ultralong tunnel was taken as the monitoring object. The test tunnel was first scanned using a 3D laser scanner, and the collected data were processed. The internal structural data of the tunnel were subsequently compared with its actual contour lines and the data of its primary branch and secondary lining on different dates. The results indicate that the arch roof of the tunnel tended to be stable within a certain time range when the positions of the primary branch and secondary lining were at different measuring points with different pile numbers. The deformation of the pile number on the left and right sides did not generally exceed 0.02 m, except at a few measuring points. A comparison between the actual cross section of the initial branch and that of the designed section showed that the actual elevation of the arch of the initial branch of the tunnel was greater than its designed elevation by no more than 0.3 m. Hence, through this study, a convenient and practical method is presented for monitoring deformation in complex curved tunnel structures.
Funder
National Natural Science Foundation of China Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City
Reference44 articles.
1. Peiqing, L.U., and Chao, T. (2020). Application of mobile 3D laser scanning technology in deformation monitoring of subway tunnels. Bull. Surv. Mapp., 155–157. 2. Jia, D., Zhang, W., and Liu, Y. (2021). Systematic approach for tunnel deformation monitoring with terrestrial laser scanning. Remote Sens., 13. 3. Han, Y., Sun, H., and Zhong, R. (2021). Three-dimensional linear restoration of a tunnel based on measured track and uncontrolled mobile laser scanning. Sensors, 21. 4. Investigation on the influence caused by shield tunneling: WSN monitoring and numerical simulation;Liu;Adv. Civ. Eng.,2021 5. Wang, X., Wang, M., Jiang, R., Xu, J., Li, B., Wang, X., Yu, J., Su, P., Liu, C., and Yang, Q. (2023). Structural deformation monitoring during tunnel construction: A review. J. Civ. Struct. Health Monit., 1–23.
|
|