Abstract: To comprehensively assess the overall deformation of tunnel cross-sections, a deformation monitoring method based on 3D laser scanning technology was applied in a large-deformation tunnel project. According to the principles of 3D laser deformation monitoring and point cloud processing, the monitoring process was divided into four stages: pre-operation preparation, point cloud data acquisition, point cloud data processing, and deformation analysis. The standard workflow for tunnel deformation monitoring using 3D laser scanning was systematically established. Specific field operation procedures were adaptively modified according to the environmental characteristics of large-deformation tunnels. The monitoring results provided comprehensive representations including deformation nephograms, cross-sectional profiles, and deformation time-history curves. These outputs enabled: rapid evaluation of overall deformation within monitored sections, visual identification of high-deformation zones, assessment of deformation impacts on tunnel clearances, and quantitative analysis of deformation values and convergence trends at specific locations, demonstrating holographic characteristics. The 3D laser deformation monitoring technique shows significant potential for widespread application. However, relevant technical specifications and operational standards should be established in current regulations to improve the technical level of tunnel deformation monitoring.
李行. 三维激光扫描在大变形隧道中的变形监测应用[J]. 隧道与地下工程灾害防治, 2025, 7(4): 115-123.
LI Hang. Application of 3D laser scanning for deformation monitoring in large deformation tunnels. Hazard Control in Tunnelling and Underground Engineering, 2025, 7(4): 115-123.
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2025, Vol. 7 
