Abstract:
Understanding the energy evolution mechanism of landslide debris flow is crucial for the prevention and control of landslide disasters, as it involves complex collisions, friction, and energy transformation.Taking the Sanxicun landslide in Sichuan Province as a case study, this research employs discrete element method modeling to investigate the motion deposition characteristics, energy evolution process, and impact on buildings under different soil particle sizes.The results show that the deposition characteristics of landslides do not vary significantly under different particle size conditions.However, they have a significant impact on internal energy conversion and the impact force on buildings.Larger particle sizes result in faster initiation velocity of landslides, higher peak kinetic energy velocity, more energy dissipation caused by collisions but less consumed by friction.The larger inter-particle spacing in coarse-grained soils leads to more pronounced collision effects between particles facilitating efficient energy transfer and increased impact forces on sliding masses.Therefore, the influence of particle size on the flow characteristics of landslide cannot be ignored in the simulation process.These findings reveal the energy evolution mechanism of soil particles during landslide motion under different soil particle sizes and provide preliminary insights into the influence of energy evolution on building impacts.This research offers valuable guidance for preventing and controlling landslide.