基于三维激光扫描技术的地下隧道工程限界分析与应用研究

Analysis and Application of Metro Boundary Measurement Based on Three-dimensional Laser Point Cloud

地铁是典型地下隧道工程,而作为地铁建设过程中必不可少的一环,限界测量分析是轨道铺设和设备安装的必备条件。限界分析往往需要提供隧道断面上特定位置点的相关数据,传统全站仪单点测量方式难以满足,而借助三维激光扫描技术,则可以获得整个隧道的空间形态,提取任意位置的几何数据;本文以RTC360扫描仪获取的青岛地铁1号线高精度点云数据为基础,通过对点云数据拼接、绝对定向、去噪、裁切和抽稀等预处理,利用自主研发的隧道点云处理软件自动提取任意里程指定位置的限界数据并一键报表生产。相比全站仪测量方式,基于三维激光点云数据的地铁限界分析方法可以准确获取特定位置的数据,极大地提高内外业作业效率。

Subway is a typical underground tunnel project,as an indispensable part of metro construction process,boundary measurement and analysis is a necessary condition for track laying and equipment installation.Boundary analysis often needs to provide the relevant data of the specific points on the tunnel section.,and the traditional single-point measurement method of total station is difficult to meet.With the help of three-dimensional laser scanning technology,the spatial form of the whole tunnel can be obtained and geometric data of any position can be extracted.This paper takes the height of Qingdao Metro Line 1 obtained by RTC360 scanner.Based on the precision point cloud data,through the pre-processing of point cloud data splicing,absolute orientation,denoising,cutting and thinning,the self-developed tunnel point cloud processing software is used to automatically extract the boundary data of any mileage designated location and produce a key report form.Compared with the total station measurement method,the Metro boundary analysis method based on three-dimensional laser point cloud data can accurately obtain specific location data,greatly improving the efficiency of internal and external oper ations.