Three-dimensional fine model construction of instability in dangerous rock masses

College of engineering, Tibet university, Lhasa 850000, China

Abstract

Rock collapse is a common geological hazard in mountainous areas, and the prediction of the stability of dangerous rocks has always been a difficult problem in engineering practice. In this paper, a dangerous rock body in Ritu, Tibet, was scanned and measured using UAV tilt photography and 3D laser scanning technology, and the high-precision data collected by the UAV were processed and constructed into a 3D fine model, and the movement state of the dangerous rock body when it is destabilised was numerically simulated using Unity3D. In order to verify the simulation effect, a field test was conducted on a slope around Lhasa and the field test results were fitted to the numerical simulation results. By comparing the data obtained, the 3D modelling data of the high and steep slope collected by the UAV was more refined and the model was more complete than that collected by the 3D laser. Comparing the field test results with the numerical simulation results, the fit between the two is good, indicating the feasibility of using the model data obtained by UAV tilt photography for hazardous rock investigation, which provides an important reference value for future investigations of hazardous rock on high and steep slopes.