Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact

doi:10.1007/s10346-019-01243-2

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Load-attenuation mechanisms of flexible barrier subjected to bouldery debris flow impact
	Song, D.3,4,5; Choi, C. E.1,5; Ng, C. W. W.5; Zhou, Gordon G. D.3,4; Kwan, J. S. H.6; Sze, H. Y.6; Zheng, Y.2
刊名	LANDSLIDES
	2019-12-01
卷号	16 期号:12 页码:2321-2334
关键词	Debris flow Boulder Flexible barrier Load-attenuation mechanism Impact load
ISSN号	1612-510X
DOI	10.1007/s10346-019-01243-2
产权排序	1
文献子类	Article
英文摘要	The 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.
电子版国际标准刊号	1612-5118
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000509669500003
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/33766]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Zhou, Gordon G. D.
作者单位	1.HKUST Jockey Club Inst Adv Study, Kowloon, Hong Kong, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China 3.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Peoples R China; 4.Univ Chinese Acad Sci, Beijing, Peoples R China; 5.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China; 6.Govt HKSAR, Civil Engn & Dev Dept, Geotech Engn Off, Hong Kong, Peoples R China;
推荐引用方式 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.