分析了地面三维激光扫描系统的测量原理与数据处理方法,研究了点云数据的NURBS曲面重构方法。应用地面三维激光扫描仪采集竣工盾构隧道点云数据,构建了隧道点云模型。选取点云模型的两个横断面与设计断面进行了比较,结果表明,地面三维激光扫描技术可为隧道竣工测量提供更便捷和实用的方法。 The measurement principle and data processing method of ground 3D laser scanning system are analyzed. The NURBS surface reconstruction method of point cloud data is studied. The surface point cloud data of the completed shield tunnel was acquired by using the terrestrial 3D laser scanner, and the tunnel cloud model was constructed. Two cross sections of the selected point cloud model are compared with the design cross section. The results show that the ground 3D laser scanning technology can provide a more convenient and practical method for tunnel completion measurement.