三维激光扫描技术在高铁盾构隧道调线调坡中的应用

The Application of 3D Laser Scanning Technology in Alignment and Gradient Adjustment of High-speed Railway Shield Tunnels

为解决传统高铁盾构隧道调线调坡方法数据获取效率不高、不可重复利用等缺陷,文章依托实际工程案例,在阐述三维激光扫描技术测量原理的基础上,采用基于控制点的测站拼接方式来规避点云拼接过程中产生的累积误差,经过点云数据去噪后,利用基于正交回归的圆曲线拟合方法实现对中心坐标的获取。结果显示,在高铁盾构隧道工程中应用三维激光扫描技术进行调线调坡具有一定的可行性,中心坐标精度优于10 cm,符合工程相关规范要求,技术应用效果良好。

In order to solve the defects of low data acquisition efficiency and non-reusability of traditional high-speed railway shield tunnel alignment and gradient adjustment method,based on the actual engineering case,this paper expounds the measurement principle of 3D laser scanning technology,and adopts the station splicing method based on control points to avoid the accumulative error generated in the process of point cloud splicing.After the point cloud data is denoised,the circular curve fitting method based on orthogonal regression is used to obtain the center coordinates.The results show that the application of 3D laser scanning technology in high-speed railway shield tunnel engineering has certain feasibility,and the center coordinate accuracy is better than 10 cm,which meets the requirements of relevant engineering specifications,and the technical application effect is good.