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Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact
Song, D.1,2,3; Choi, C. E.3,4; Ng, C. W. W.3; Zhou, Gordon G. D.1,2; Kwan, J. S. H.5; Sze, H. Y.5; Zheng, Y.6
2019-12-01
Source PublicationLANDSLIDES
ISSN1612-510X
EISSN1612-5118
Volume16Issue:12Pages:2321-2334
SubtypeArticle
Contribution Rank1
AbstractThe impulse load of boulders at the front of debris flows is critical to the design of structural defense measures, which are commonly constructed on hillsides to mitigate landslide risk. Field evidences have demonstrated the capability of some steel flexible barriers in intercepting debris flows with bouldery inclusions. However, there is still a lack of fundamental understanding of the load-attenuation mechanisms of flexible barriers, especially under bouldery debris flow impact. In this study, systematic tests of mono-disperse and bi-disperse bouldery flows impacting an instrumented flexible barrier were conducted using a geotechnical centrifuge. The impact kinematics and barrier responses, such as mobilized structural forces and elongation of cables, were recorded synchronously. The results reveal that the load-attenuation mechanism of flexible barriers for the frontal impact originates from the barrier deflections and extended interaction duration. Only 30% of the frontal momentum is transferred to the flexible barrier. The performance of the flexible barrier is compared with that of a rigid barrier model under identical testing conditions. It is found that the boulder impulse loads on flexible barrier are significantly attenuated, resulting in a "plateau" pattern of the impact time history. The practical implication is that the design of flexible barriers may not demand separate considerations of the bulk debris and individual boulder impact loads. Detailed examination of the state of debris deposited behind the flexible barrier indicates that the static dry debris is close to the active failure state due to the large barrier deflection.
KeywordDebris flow Boulder Flexible barrier Load-attenuation mechanism Impact load
DOI10.1007/s10346-019-01243-2
Indexed BySCI
Language英语
Quartile2区
TOP
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000509669500003
PublisherSPRINGER HEIDELBERG
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/33766
Collection山地灾害与地表过程重点实验室
Corresponding AuthorZhou, Gordon G. D.
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Peoples R China;
2.Univ Chinese Acad Sci, Beijing, Peoples R China;
3.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China;
4.HKUST Jockey Club Inst Adv Study, Kowloon, Hong Kong, Peoples R China;
5.Govt HKSAR, Civil Engn & Dev Dept, Geotech Engn Off, Hong Kong, Peoples R China;
6.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, 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
Corresponding 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. Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact[J]. LANDSLIDES,2019,16(12):2321-2334.
APA Song, D..,Choi, C. E..,Ng, C. W. W..,Zhou, Gordon G. D..,Kwan, J. S. H..,...&Zheng, Y..(2019).Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact.LANDSLIDES,16(12),2321-2334.
MLA Song, D.,et al."Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact".LANDSLIDES 16.12(2019):2321-2334.
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