关键词: 地铁隧道结构检测, 车载式激光扫描, 组合滤波, 结构参数计算

Abstract: Aiming at the basic content and requirements of metro tunnel structure inspection, based on vehicle-mounted laser scanning technology, this paper studies metro tunnel structure inspection methods. The on-vehicle laser scanning system is used to collect the point cloud data of the subway tunnel. The combined filtering method of the RANSAC algorithm and the scale normal algorithm is used to pre-process the point cloud data. By slicing, fitting and unfolding the point cloud data of the tunnel processing, it calculates and analyzes the cross-section deformation, convergence value, stagger value and leakage value of the subway tunnel. The research results show that the vehicle-mounted laser scanning technology can quickly detect and analyze the deformation of the subway tunnel structure, which is suitable for the regular inspection and deformation analysis of the subway tunnel structure.

Key words: metro tunnel structure inspection, vehicle-mounted laser scanning, combined filtering, calculation of structural parameters