Propagation Modeling of Rainfall-Induced Landslides: A Case Study of the Shaziba Landslide in Enshi, China

Geological disasters, especially landslides, frequently occur in Enshi County, Hubei Province, China. On 21 July 2020, a large-scale landslide occurred due to continuous rainfall. The mass blocked the Qingjiang River, formed dammed lake and caused great damage surrounding roads village buildings. In this study, geomechanical properties of were obtained through field surveys. A three-dimensional topography model slope was established using particle flow code (PFC) numerical parameters calibrated. 3D discrete element (DEM) used simulate propagation Shaziba landslide, dynamic behavior divided into five stages. simulation results show that movement lasted approximately 1000 s. maximum average velocity reached up 7.5 m/s runout distance about m. simulated morphology deposits good agreement with data. addition, influence effective modulus on calculation analyzed. indicate are closely related contact PFC3D.