Abstract:In order to solve the problem that the high slope of expressway is prone to instability and difficult to monitor, a 3D laser scanning technique is proposed to monitor and analyze the non-contact deformation of the high slope.To solve the problem of point cloud data of slope in different periods object difficult to registration problem, design a set of triangular pyramid as a permanent control points based on slope, through each phase of the point cloud data of corresponding control points triangular pyramid feature extraction, on how to coordinate system conversion period of point cloud data, and then realize the period of the coordinates of the point cloud data registration, and after the registration of multiphase point cloud data is analyzed, using the algorithm procedures and extract the slope deformation information.The results show that the automatic deformation monitoring of expressway high slope with 3d laser scanning technology can obtain the deformation information of the slope from local to overall, predict the development of the slope in advance, and give an early warning of the instability of the slope.It can be seen that the application of 3D laser scanning technology to deformation monitoring of high slope has obvious advantages, feasibility and application value.