移动三维激光扫描技术在盾构隧道收敛监测中的应用

盾构隧道收敛监测是地铁运营检测的重要监测部分。针对收敛尺、全站仪、断面仪和巴塞特收敛系统、站式扫描仪等传统监测设备和监测方法的缺陷，本文提出一种基于移动三维激光扫描的新型收敛监测方法。移动三维激光扫描技术是利用二维断面扫描仪结合移动轨道车、惯性导航定位及编码器等多种传感器协同作业，通过人工推行扫描的方式全面获取隧道结构点云数据。结合自动化点云处理软件对管片断面收敛进行分析，实现地铁隧道收敛的快速全面监测，弥补了传统收敛监测效率低、断面监测不完善的缺点。工程应用实例结果表明，该方法不仅可以实现隧道收敛快速、高效监测，而且获取的海量点云数据可进一步深度挖掘，为地铁隧道的安全监测提供基础数据，保障地铁安全运行。

Application of mobile 3D laser scanning technology in convergence detection of shield tunnel

Shield tunnel convergence monitoring is an important monitoring indicator for metro operation detection. It focuses on the inadequacy of traditional monitoring equipment and monitoring methods such as convergence rulers, total stations, cross-section meters, Bassett convergence systems, and station scanners. This paper proposes a novel convergence monitoring method based on mobile 3D laser scanning. Mobile 3D laser scanning technology uses a 2D cross-section scanner combined with a variety of sensors such as mobile rail cars, inertial navigation and positioning, and encoders to work together to obtain point cloud data of the tunnel structure through manual scanning. Analysis of convergence of tube segments. The fast and comprehensive monitoring of the cross section convergence of the subway tunnel is made up for the shortcomings of low efficiency and incomplete cross section monitoring of traditional convergence monitoring. The results of engineering application examples show that this method can not only achieve fast and efficient monitoring of tunnel cross-section convergence, but also the massive point cloud data obtained can be further deepened, providing basic data guarantee for subway tunnel safety monitoring, and ensure the safe operation of the subway.