Abstract: Landslide geological disasters, common and worldwide, feature intermittency and enormous destructive power. An effective numerical model for such disasters helps formulate the targeted prevention and control strategies of landslides. Focusing on the particle flow characteristics of landslide movement, this paper derives an expression of the dynamic friction coefficient of shallow landslides based on the μ(I) model, and constructs a corresponding framework for solutions using the Smoothed Particle Hydrodynamics (SPH) method. We examine the significant impact of particle fragmentation on landslide movement, and derive a relationship of its basal frictional force versus grain distribution to improve the model by applying the particle fragmentation law based on its potential of destruction. This model is verified against two previous studies in literature－classical three-dimensional slope model experiments, along with a sensitivity analysis on its parameters related to particle fragmentation effects, thus laying a basis for further study of landslide disaster prevention and control.

Key words: landslide, μ(I) model, smoothed particle hydrodynamics (SPH), particle fragmentation