摘要
通过三维激光扫描技术对地铁隧道进行变形监测,对点云数据进行预处理后,用基于最小包围盒法提取中轴线,以中轴线为基准,先提取断面进行局部拟合再结合RANSAC算法对所有断面进行二次曲面全局拟合进行整体隧道状态分析。可将复杂的隧道模型的全局拟合转化成对许多圆环切片进行的局部拟合,减小了工作量,便于对重点观测部位进行变形监测。对某地铁隧道扫描数据进行处理与对比,表明此方法满足实际作业需求。
Through the 3D laser scanning technology,the deformation monitoring of the subway tunnel is carried out.After preprocessing the point cloud data,the central axis is extracted based on the minimum bounding box method,and the central axis is used as the reference.Combined with the RANSAC algorithm,the quadratic surface global fitting of all sections is used to analyze the overall tunnel state.The global fit of the complex tunnel model can be transformed into a local fit to many ring slices,reducing the workload and facilitating deformation monitoring of key observation sites.Process and compare the scan data of a subway tunnel.It shows that this method meets the actual operation requirements and has practical value.
作者
秦炳权
Qin Bingquan(Guangzhou Urban Planning & Design Survey Research Institute,Guangzhou 510060,China)
出处
《城市勘测》
2019年第3期138-141,共4页
Urban Geotechnical Investigation & Surveying
关键词
三维激光扫描
变形监测
最小包围盒
中轴线提取
断面提取
RANSAC算法
3D laser scanning
deformation monitoring
minimum bounding box
central axis extraction
section extraction
RANSAC algorithm
