Energy evolution of gravitational-granular flows

  • Quach Viet Anh Faculty of Hydraulic Engineering, Hanoi University of Civil Engineering, 55 Giai Phong Road, Hanoi, Vietnam
  • Nguyen Duc Manh Faculty of Hydraulic Engineering, Hanoi University of Civil Engineering, 55 Giai Phong Road, Hanoi, Vietnam
  • Le Van Thao Faculty of Water Resources Engineering, University of Science and Technology - The University of Danang; 54 Nguyen Luong Bang Street, Lien Chieu District, Da Nang City, Vietnam
  • Vo Thanh Trung School of Transportation Engineering, Danang Architecture University, 566 Nui Thanh Street, Da Nang City, Vietnam https://orcid.org/0000-0003-0259-7165
DOI: https://doi.org/10.31814/https://doi.org/10.31814/stce.huce2024-18(1)-11
Keywords: Cohesive stress, Discrete element method, Flow mobility, Kinetic energy, Plunging length

Abstract

The catastrophe of natural disasters such as landslides, is a prevalent phenomenon in natural terrain conditions in high mountainous areas; however, the mobility of such landslides has not yet well understood due to the discrete nature of material and the coming to play of water. In this paper, we numerically study the mobility of an unsaturated gravitational-granular flow, occurring on a slope-break system that contains two regions: inclined-upstream and horizontal-downstream areas, by using three-dimensional discrete element simulations. A sliding volume composed of spherical grains collapses on the first region, then plunges and deposits on the second one. The upstream-plunging length and the cohesive stress exerted on grains affect differently on the energy evolution not only in the whole process but also in different regions and directions depending on the inclination angle. These findings provide a deep understanding of the mechanism and mobility of landslides, leading to good predictions about the potential impacts of the catastrophic landslides on buildings and human lives.

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Published
25-03-2024
How to Cite
Anh, Q. V., Manh, N. D., Thao, L. V., & Trung, V. T. (2024). Energy evolution of gravitational-granular flows. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, 18(1), 143-152. https://doi.org/10.31814/https://doi.org/10.31814/stce.huce2024-18(1)-11
Issue
Vol 18 No 1 (2024)
Section
Research Papers

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