基于移动三维激光扫描的地铁盾构环片提取与分析

随着我国轨道交通的不断发展，城市轨道交通已成为公共交通的重要组成部分。目前我国轨道交通安全主要采用全站仪和站式扫描仪等设备进行监测，具有监测效率低、监测点布设困难、对管片衬砌有损伤等缺点。移动三维激光扫描是一种新型轨道交通结构安全检测技术。本文采用移动三维激光扫描技术获取隧道内部完整结构点云数据，对移动三维激光点云进行环片提取分析，对获取的断面点云进行处理分析，得到环片变形情况。试验结果表明，该方法不仅能够获取准确的环片变形结果，而且实现了逐环提取分析，大大提高了环片监测的效率。

Extraction and analysis of subway shield ring based on mobile 3D laser scanning

With the continuous development of rail transit in our country, urban rail transit has become an important component of public transportation. At present, our country's rail transportation safety monitoring mainly uses equipment such as total stations and station scanners for monitoring, which has the disadvantages of low monitoring efficiency, difficulty in laying monitoring points, and damage to the segment lining. Mobile 3D laser scanning is a new type of rail transit structure safety detection technology. In this paper, the mobile 3D laser scanning technology is used to obtain the data of the complete structure point cloud inside the tunnel. Extract and analyze the mobile 3D laser point cloud, process and analyze the obtained section point cloud so as to obtain the deformation of the ring piece. The experimental results show that the method is not only accurate in obtaining the deformation results of the rings, but also can extract and analyze the rings one by one, which improve the efficiency of the ring monitoring greatly.