In rockfall simulations, the characteristics of rocks and slopes have a great influence on the analysis results. In this study, we propose a UAV photogrammetry as a method to determine the slope geometry which has a great influence on the rockfall behavior.The study site was a school bus route adjacent to steep slope. Rocfall program was used to simulate two models near the tunnel and slope of varying slope geometry, where only the slope geometry is changed with the same material properties for both the slope and rocks. The simulation results were compared with the results using UAV photogrammetry and the slopes extracted from the digital map. The slopes extracted from the UAV photogrammetry differed significantly from those extracted from the digital map. This difference of slopes had a great influence on the rockfall simulation results. On the slopes of the digital map, it was predicted that rockfall could affect roads and tunnels. However, the simulation results using the actual slope using the UAV photogrammetry did not show a significant effect on the facility. UAV surveys were able to reflect the latest on-site conditions, and more accurate risk assessments were possible.
Volume 11 | 06-Special Issue
Pages: 1967-1973