Simulation analysis of rockfall characteristics and avalanche trajectories on high and steep slopes

Abstract

Geological disasters occur frequently in the southwest of China, and the hazardous rock collapse disaster is one of the common geological disasters. Huaguo Mountain dangerous rock collapse area is located in Yantian County, Zhaotong City, Yunnan Province, the geomorphology of the area is shaped by tectonic dissolution and river erosion together in the low mountain canyon geomorphology. The terrain is steep, with well-developed joints and fissures. The rock body is fractured, and under the influence of unfavorable factors such as rainfall and earthquakes, parts of the rock body have collapsed or fallen. This makes it a less stable area with a high distribution of hazardous rock formations. In order to study the trajectory characteristics of the falling movement of hazardous rock mass in this area, a high-precision digital terrain model(DTM) was generated through on-site investigation and high-precision aerial image data from a drone, and the model was imported into RocPro3D to simulate and analyze the falling movement of the hazardous rock mass. The result show that, for the simulation of rockfall in the critical rock belt of Huaguo Mountain, the trajectory of rockfall is roughly oriented to the southeast and southwest sides of the three-stage ladder of Huaguo Mountain. Through the analysis of the specific trajectory, the simulated effect of intercepting falling rocks is remarkable by setting up passive protection nets P1 and P2 with a height of 10 m and a maximum impact energy of 250kJ on both sides of the foot of the slope. The simulation can improve the accuracy and reliability of collapse disaster prediction, provide scientific basis for disaster prevention and mitigation work, and help to promote the application and development of the combination of RocPro3D simulation technology and UAV images in the field of collapse prevention and control.

Keywords

unstable rock mass / numerical simulation / motion trajectory simulation / unmanned aerial vehicle(UAV) / RocPro3D