A NUMERICAL MODEL FOR SIMULATION OF FLOWSLIDE ON CURVED TOPOGRAPHY

The movement of the flowslide is complex due to the centrifugal force and centripetal force of curved topography. However, it was not fully considered in the past. Based on the LS_RAPID model, this paper puts forward a new method to calculate centrifugal force and centripetal force of flowslide mass due to surface topography. The control equations of the LS_RAPID are revised to a new model which considers the influence of surface topography, which is named as LSD_T(Landslide Dynamic_Terrain) model. This new model is used to simulate a typical flowslide-Dagou landslide in Tianshui city. The simulation result is compared with that of LS_RAPID model using the same parameters. Results show that the surface topography's effect on the movement of sliding mass is not obvious in the LS_RAPID model. The sliding mass rushes out of the channel at the corner, which is not conform to the actual movement of the flowslide. However, the LSD_T model can reflect the influence of the centripetal force from curve topography better. The sliding mass moves along the channel. The trajectory is basically consistent with the actual accumulation process.