测绘通报 ›› 2023, Vol. 0 ›› Issue (10): 80-84,122.doi: 10.13474/j.cnki.11-2246.2023.0299

• 学术研究 • 上一篇    下一篇

基于点云的弯曲地铁隧道断面提取

徐景田1, 单斯奥1,2, 于睿涵1, 吴磊3, 陈刚1   

  1. 1. 中国地质大学(武汉)地理与信息工程学院, 湖北 武汉 430074;
    2. 湖北省电力勘测设计院 有限公司, 湖北 武汉 430040;
    3. 国家石油天然气管网集团有限公司西气东输分公司武汉输气 分公司, 湖北 武汉 430074
  • 收稿日期:2022-12-15 发布日期:2023-10-28
  • 通讯作者: 单斯奥。E-mail:ssa@cug.edu.cn
  • 作者简介:徐景田(1970-),男,教授,主要研究方向为地质灾害监。E-mail:xujingtian@cug.edu.cn
  • 基金资助:
    国家自然科学基金(42077269)

Extraction of curved metro tunnel section based on point cloud

XU Jingtian1, SHAN Siao1,2, YU Ruihan1, WU Lei3, CHEN Gang1   

  1. 1. School of Geography and Information Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China;
    2. Hubei Electric Power Survey and Design Institute Co., Ltd., Wuhan 430040, China;
    3. Wuhan Gas Transmission Branch, West-East Gas Transmission Branch, National Petroleum and Natural Gas Network Group Co., Ltd., Wuhan 430074, China
  • Received:2022-12-15 Published:2023-10-28

摘要: 三维激光扫描技术已广泛应用于运营期地铁隧道变形监测工作。针对常用地铁隧道中轴线获取方法存在的问题与不足,本文基于地铁隧道点云高程差异,提取隧道拱顶点云并拟合曲线,采用拱顶轴线代替中轴线对弯曲地铁隧道断面进行连续提取。针对传统断面去噪过程复杂、效率低下等问题,改进一种基于隧道断面几何特征的半径滤波去噪算法,且对去噪后的断面点进行椭圆拟合对比。利用武汉某弯曲地铁隧道点云数据进行试验,结果表明,以拱顶轴线代替中轴线提取弯曲地铁隧道断面的方法精度可靠,改进后的断面去噪算法简单高效,能够提高隧道变形监测工作效率。

关键词: 点云, 地铁隧道轴线, 断面提取, 半径滤波

Abstract: 3D laser scanning technology has been widely used in the deformation monitoring of metro tunnels during the operation period. In view of the problems and shortcomings of common methods for obtaining the central axis of metro tunnel,based on the elevation difference of metro tunnel point cloud,this paper extracts the tunnel crown point cloud and fits the curve,and uses the crown axis instead of the central axis to extract the curved metro tunnel section continuously. Aiming at the problems of complex process and low efficiency of traditional section denoising methods,a radius filtering denoising algorithm based on the geometric characteristics of tunnel section is improved,and the denoised section points are compared by ellipse fitting. The experiment is carried out with the point cloud data of a curved metro tunnel in Wuhan. The results show that the method of extracting the curved metro tunnel section by replacing the central axis with the crown axis is accurate and reliable,and the improved section denoising algorithm is simple and efficient,which can improve the efficiency of tunnel deformation monitoring.

Key words: point cloud, subway tunnel axis, section extraction, radius filtering

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