关键词: 隧道管片, 三维点云, 几何约束, 点云配准, 虚拟拼装

Abstract: [Purposes] The pre-assembly test of tunnel segments is a necessary task for tunnel construction.Traditional manual methods have problems of low efficiency and large errors.The existing virtual assembly method of segments don't fully consider the constraint relationship between the splicing surface and the bolt hole.Based on this,this paper proposes a plane extraction and point cloud registration method that consider the consistency of the splicing surface and the alignment of the bolt hole positions. [Methods] It designs an automated segment virtual assembly process,through multi-stage noise reduction filtering,coarse registration,contact surface extraction,geometric constraint fine registration,single-ring virtual assembly,multi-ring dynamic virtual assembly,achieves high-precision virtual assembly of segments. [Findings] The experimental analysis and engineering application show that the method is superior to the traditional method in terms of accuracy,efficiency,and stability.It solves the problem of easy misalignment within and between rings,and the average joint seam can reach 1.2 mm. [Conclusions] It effectively improves the quality and efficiency of segment pre-assembly,and has high engineering application value．

Key words: tunnel segment, 3D point cloud, geometric constraints, point cloud registration, virtual assembly