Impact and erosion dynamics of inclusion-enriched dry granular flows on rigid barriers with basal clearance

Numerical insights from hybrid MP-DEM simulations

verfasst von: Yupeng Jiang, Chenyang Zhang, Clarence Edward Choi
Abstract: Rigid barriers with basal openings are often installed along predicted flow paths to protect downstream facilities from dry granular flows containing large boulders. However, current design practices do not consider the effects of these inclusions during impact, discharge, overflow, and bed erosion. We conducted hybrid MP-DEM simulations to study the dynamics of dry sand flow with inclusions impacting a rigid barrier with a basal opening. Our findings show that accounting for large inclusions is crucial for barrier design, as they alter dry granular flow regimes, delay dead zone formation, and affect overflow dynamics. Current analytical solutions may overestimate velocity attenuation by up to 60% if inclusions are not considered. A 10% increase in inclusion volume fraction leads to 6%-28% increases in internal energy dissipation during overflow, resulting in an overflow distance 20% lower than existing predictions. Additionally, channel bed erosion due to landing flow with inclusions creates a flow depth up to 3.5 times thicker than at the first barrier location. This suggests that using the initial flow depth for impact force assessment on a second barrier may not be conservative for erodible channel beds and inclusion-enriched flows.
Organisationseinheit(en): Institut für Baumechanik und Numerische Mechanik
Externe Organisation(en): The University of Hong Kong
Typ: Artikel
Journal: Computers and geotechnics
Band: 176
Anzahl der Seiten: 15
ISSN: 0266-352X
Publikationsdatum: 12.2024
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Geotechnik und Ingenieurgeologie, Angewandte Informatik
Elektronische Version(en): https://doi.org/10.1016/j.compgeo.2024.106767 (Zugang: Geschlossen)

BibTeX

@article{a03a5b2e27c046c58ee4d352ab1c0a65,
title = "Impact and erosion dynamics of inclusion-enriched dry granular flows on rigid barriers with basal clearance: Numerical insights from hybrid MP-DEM simulations",
abstract = "Rigid barriers with basal openings are often installed along predicted flow paths to protect downstream facilities from dry granular flows containing large boulders. However, current design practices do not consider the effects of these inclusions during impact, discharge, overflow, and bed erosion. We conducted hybrid MP-DEM simulations to study the dynamics of dry sand flow with inclusions impacting a rigid barrier with a basal opening. Our findings show that accounting for large inclusions is crucial for barrier design, as they alter dry granular flow regimes, delay dead zone formation, and affect overflow dynamics. Current analytical solutions may overestimate velocity attenuation by up to 60% if inclusions are not considered. A 10% increase in inclusion volume fraction leads to 6%-28% increases in internal energy dissipation during overflow, resulting in an overflow distance 20% lower than existing predictions. Additionally, channel bed erosion due to landing flow with inclusions creates a flow depth up to 3.5 times thicker than at the first barrier location. This suggests that using the initial flow depth for impact force assessment on a second barrier may not be conservative for erodible channel beds and inclusion-enriched flows.",
keywords = "Basal opening, Dry granular flow, Erosion, Inclusions, Rigid barrier",
author = "Yupeng Jiang and Chenyang Zhang and {Edward Choi}, Clarence",
note = "Publisher Copyright: {\textcopyright} 2024",
year = "2024",
month = dec,
doi = "10.1016/j.compgeo.2024.106767",
language = "English",
volume = "176",
journal = "Computers and geotechnics",
issn = "0266-352X",
publisher = "Elsevier BV",
}