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- Title
Centrifuge and DEM investigation of dry granular impacts: Effect of granular volume under high-speed impact conditions.
- Authors
Zhang, Bei; Li, Wenyang; Pu, Jian; Bi, Yandong; Huang, Yu
- Abstract
Large-scale high-speed granular avalanches can be catastrophic; however, small-scale model tests cannot reproduce the high-speed impact effect, resulting in barrier designs lacking detailed knowledge considering the prototypical dynamic conditions of granular avalanches (e.g., high moving velocities and varied material volumes). In this paper, a well-designed centrifuge model is adopted to reproduce high-speed granular avalanches with variable flow velocities and material volumes, and a calibrated DEM model is also used to offer further insights. The results indicate that under high-speed impact conditions, the effect of granular volume on the pressure distribution pattern dominates, but its influence on the impact loading rate is less obvious. To estimate the high-speed impact force, a constant pressure coefficient of 1 can provide a reasonable estimation for the dynamic component if boulder impacts are excluded, and the static component can be calculated using the weight of the dead zone based on the assumption of a static state of the dead zone. In addition, considering the transition of the impact pressure distribution model caused by different granular volumes and flow velocities, a rectangular pressure profile is suggested for barrier design against high-speed dry granular avalanches when the peak total impact force is adopted as the design load.
- Subjects
GRANULAR flow; CENTRIFUGES; FLOW velocity; IMPACT loads; IMPACT (Mechanics)
- Publication
Landslides, 2024, Vol 21, Issue 6, p1439
- ISSN
1612-510X
- Publication type
Article
- DOI
10.1007/s10346-024-02219-7