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 > Journal of Mountain Science > Journal of Mountain Science-2019 > Vol16 No.7

	Debris flow impact on flexible barrier: effects of debris-barrier stiffness and flow aspect ratio
	Song, Dong-ri; Zhou, Gordon G. D.; Choi, Clarence Edward; Zheng, Yun
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2019
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
文献子类	Article
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.
电子版国际标准刊号	1993-0321
语种	英语
WOS记录号	WOS:000474574600012
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/46538]
专题	Journal of Mountain Science_Journal of Mountain Science-2019_Vol16 No.7
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.