Influence of particle size on energy evolution of debris flow in landslide based on DEM: A case study of Sanxicun landslide

TAO Wei; HU Xiaobo; JIANG Yuanjun; XIAO Kun; TANG Junjie

doi:10.12097/j.issn.1671-2552.2023.09.015

2023 Vol. 42, No. 9

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TAO Wei, HU Xiaobo, JIANG Yuanjun, XIAO Kun, TANG Junjie. 2023. Influence of particle size on energy evolution of debris flow in landslide based on DEM: A case study of Sanxicun landslide. Geological Bulletin of China, 42(9): 1610-1619. doi: 10.12097/j.issn.1671-2552.2023.09.015

Citation:

TAO Wei, HU Xiaobo, JIANG Yuanjun, XIAO Kun, TANG Junjie. 2023. Influence of particle size on energy evolution of debris flow in landslide based on DEM: A case study of Sanxicun landslide. Geological Bulletin of China, 42(9): 1610-1619. doi: 10.12097/j.issn.1671-2552.2023.09.015

Influence of particle size on energy evolution of debris flow in landslide based on DEM: A case study of Sanxicun landslide

1.
Sichuan Ya-Kang Expressway Co., Ltd., Chengdu 610047, Sichuan, China
2.
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Shanghai 20 Metallurgical Construction Co. Ltd., Shanghai 201900, China
5.
Southwest University of Science and Technology, Mianyang 621010, Sichuan, China

More Information

Corresponding author: HU Xiaobo, 576808270@qq.com

Received Date: 23 September 2021

Revised Date: 29 October 2021

Publish Date: 15 September 2023

Abstract

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.
- energy curve /
- discrete element method /
- impact force /
- particle size /
- landslide /
- debris flow

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References

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