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Geophysical flows impacting a flexible barrier: effects of solid-fluid interaction
Song, D.1,2,3; Choi, C. E.3,4; Ng, C. W. W.3; Zhou, G. G. D.1,2
Source PublicationLANDSLIDES
AbstractFlexible barriers undergo large deformation to extend the impact duration, and thereby reduce the impact load of geophysical flows. The performance of flexible barriers remains a crucial challenge because there currently lacks a comprehensive criterion for estimating impact load. In this study, a series of centrifuge tests were carried out to investigate different geophysical flow types impacting an instrumented flexible barrier. The geophysical flows modelled include covered in this study include flood, hyperconcentrated flow, debris flow, and dry debris avalanche. Results reveal that the relationship between the Froude number, Fr, and the pressure coefficient alpha strongly depends on the formation of static deposits called dead zones which induce static loads and whether a run-up or pile-up impact mechanism develops. Test results demonstrate that flexible barriers can attenuate peak impact loads of flood, hyperconcentrated flow, and debris flow by up to 50% compared to rigid barriers. Furthermore, flexible barriers attenuate the impact load of dry debris avalanche by enabling the dry debris to reach an active failure state through large deformation. Examination of the state of static debris deposits behind the barriers indicates that hyperconcentrated and debris flows are strongly influenced by whether excessive pore water pressures regulate the depositional process of particles during the impact process. This results in significant particle rearrangement and similar state of static debris behind rigid barrier and the deformed full-retention flexible barrier, and thus the static loads on both barriers converge.
KeywordGeophysical Flows Solid-fluid Interaction Impact Flexible Barrier Centrifuge Modelling
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
WOS Subject ExtendedEngineering ; Geology
Indexed BySCI
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000419461100008
Funding OrganizationResearch Grants Council of the Government of Hong Kong SAR, China(T22-603/15-N) ; HKUST Jockey Club Institute for Advanced Study ; Chinese Academy of Sciences (CAS) Pioneer Hundred Talents Program ; Youth Innovation Promotion Association, CAS ; National Natural Science Foundation of China(11672318) ; International partnership program of Chinese Academy of Sciences(131551KYSB20160002)
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Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChoi, C. E.
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu, Sichuan, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
4.Hong Kong Univ Sci & Technol, HKUST Jockey Club Inst Adv Study, Kowloon, Hong Kong, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Song, D.,Choi, C. E.,Ng, C. W. W.,et al. Geophysical flows impacting a flexible barrier: effects of solid-fluid interaction[J]. LANDSLIDES,2018,15(1):99-110.
APA Song, D.,Choi, C. E.,Ng, C. W. W.,&Zhou, G. G. D..(2018).Geophysical flows impacting a flexible barrier: effects of solid-fluid interaction.LANDSLIDES,15(1),99-110.
MLA Song, D.,et al."Geophysical flows impacting a flexible barrier: effects of solid-fluid interaction".LANDSLIDES 15.1(2018):99-110.
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