Abstract: Based on the chime hammer peak monitoring project in Chengde City,aiming at the problems of single point monitoring,low degree of automation and unable to reflect the overall shape of the peak by traditional methods,this paper uses three-dimensional laser scanning technology to monitor the chime hammer peak for a long time,and realizes the comparison of three-dimensional model data of multi-stage peaks through control measurement,point cloud data acquisition,splicing and modeling,The volume and center of gravity change of the peak are calculated,and the development trend of the peak is predicted by the volume change and center of gravity displacement extracted in the form of segmented slices. This method breaks through the limitation that the traditional measurement methods can not monitor the peak body as a whole. It monitors the peak body as a whole with non-contact,high precision,high efficiency,and uses the shape variables of the opposite and body to achieve the effect of monitoring the peak body,so as to find the more serious erosion spalling or inclined situation of the peak body,so as to provide decision-making auxiliary support for the next protection work.

Key words: 3D laser scanning, 3D model, erosion and exfoliation, volume, center of gravity