三维激光扫描技术在地铁隧道断面测量中的应用

摘要

After the construction of subway main structure,the profile of subway tunnel needs to be surveyed in order to realize the route adjustment of alignment and gradient.Compared with the conventional measuring methods,3D laser scanning technology has the characteristics of non-contact measurement and can collect space 3D point cloud data with high density,which provides a new way for the measurement of subway profile.This paper introduces the basic principles of 3D laser scanning technology and the measurement methods of subway tunnel section.In terms of tunnel section measurement engineering project in Line 1 of Nanning Rail Transit,the application feasibility of 3D laser scanning technology in tunnel profile measurement is discussed.The results of cross sectional survey provide not only the basis for the alignment and gradient adjustment of the line,but also support for tunneling model building,tunnel deformation analysis,and track laying and equipment installation.%地铁隧道土建施工完成后为了对线路进行调线调坡,需要对地铁隧道进行断面测量,三维激光扫描技术与常规测量方法相比具有非接触式测量、可高密度采集空间三维点云数据等特点,为地铁断面测量提供了新的技术手段.介绍三维激光扫描技术的基本原理和在地铁隧道断面测量中的方法,并结合南宁地铁1号线隧道断面测量工程实例,对三维激光扫描技术在地铁隧道断面测量中应用的可行性进行探讨.断面测量成果不仅为线路进行调线调坡提供依据,而且还可以为后续的隧道模型构建、隧道变形分析以及铺轨和设备安装等工作提供相关应用和支持.