Debris flow impact on flexible barrier: effects of debris-barrier stiffness and flow aspect ratio

doi:10.1007/s11629-018-5314-6

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

	Debris flow impact on flexible barrier: effects of debris-barrier stiffness and flow aspect ratio
	Song, Dong-ri1,2 ; Zhou, Gordon G. D.1,2 ; Choi, Clarence Edward 3,4; Zheng, Yun 5
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2019-07-01
卷号	16 期号:7 页码:1629-1645
关键词	Debris flow Flexible barrier Impact Stiffness Flow aspect ratio
ISSN号	1672-6316
DOI	10.1007/s11629-018-5314-6
通讯作者	Zhou, Gordon G. D.(gordon@imde.ac.cn)
英文摘要	Conventionally, flexible barriers are rated based on their ability to resist a free-falling boulder with a particular input energy. However, there is still no well-accepted approach for evaluating performance of flexible barrier under debris flow impact. In this study, a large-nonlinear finite-element model was used to back-analyze centrifuge tests to discern the effects of impact material type, barrier stiffness, and flow aspect ratio (flow height to flow length) on the reaction force between the impacting medium and flexible barrier. Results show that, in contrast to flexible barriers for resisting rockfall, the normal impact force induced by the highly frictional and viscous debris is insensitive to barrier stiffness. This is because the elongated distributions of kinetic energy are mainly dissipated by the internal and boundary shearing, and only a small portion is forwarded to the barrier. Furthermore, a new stiffness number is proposed to characterize the equivalent stiffness between a debris flow or a boulder, and a flexible barrier. Under the circumstance of an extremely elongated debris flow event, i.e., low aspect ratio, the load on a barrier is dominated by the static component and thus not sensitive to the barrier stiffness.
资助项目	National Natural Science Foundation of China[51809261] ; National Natural Science Foundation of China[11672318] ; National Natural Science Foundation of China[51709052] ; Research Grants Council of the Government of Hong Kong SAR, China[T22-603/15N] ; Research Grants Council of the Government of Hong Kong SAR, China[16209717] ; Hong Kong Jockey Club Disaster Preparedness and Response Institute[HKJCDPRI18EG01]
WOS关键词	EXPERIMENTAL TESTS ; LANDSLIDE ; DESIGN ; SLIDES ; MESH
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000474574600012
资助机构	National Natural Science Foundation of China ; Research Grants Council of the Government of Hong Kong SAR, China ; Hong Kong Jockey Club Disaster Preparedness and Response Institute
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26497]
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.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, 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, Hong Kong, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Song, Dong-ri,Zhou, Gordon G. D.,Choi, Clarence Edward,et al. Debris flow impact on flexible barrier: effects of debris-barrier stiffness and flow aspect ratio[J]. JOURNAL OF MOUNTAIN SCIENCE,2019,16(7):1629-1645.
APA	Song, Dong-ri,Zhou, Gordon G. D.,Choi, Clarence Edward,&Zheng, Yun.(2019).Debris flow impact on flexible barrier: effects of debris-barrier stiffness and flow aspect ratio.JOURNAL OF MOUNTAIN SCIENCE,16(7),1629-1645.
MLA	Song, Dong-ri,et al."Debris flow impact on flexible barrier: effects of debris-barrier stiffness and flow aspect ratio".JOURNAL OF MOUNTAIN SCIENCE 16.7(2019):1629-1645.