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

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

	Debris flow impact on flexible barrier:effects of debrisbarrier stiffness and flow aspect ratio
	SONG Dongri 2; ZHOU Gordon GD 2; CHOI Clarence Edward 1; ZHENG Yun 2
刊名	山地科学学报:英文版
	2019
卷号	16.0 期号:007 页码:1629-1645
关键词	Debris flow Flexible barrier Impact Stiffness Flow aspect ratio
ISSN号	1672-6316
其他题名	Debris flow impact on flexible barrier:effects of debrisbarrier stiffness and flow aspect ratio
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.
语种	中文
CSCD记录号	CSCD:6532966
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/55306]
专题	中国科学院水利部成都山地灾害与环境研究所
作者单位	1.马来西亚理科大学 2.Key Laboratory of Mountain Hazards and Earth Surface Process/Institute of Mountain Hazards and Environment,Chinese Academy of Sciences 3.中国科学院大学 4.普林斯顿高等研究院
推荐引用方式 GB/T 7714	SONG Dongri,ZHOU Gordon GD,CHOI Clarence Edward,et al. Debris flow impact on flexible barrier:effects of debrisbarrier stiffness and flow aspect ratio[J]. 山地科学学报:英文版,2019,16.0(007):1629-1645.
APA	SONG Dongri,ZHOU Gordon GD,CHOI Clarence Edward,&ZHENG Yun.(2019).Debris flow impact on flexible barrier:effects of debrisbarrier stiffness and flow aspect ratio.山地科学学报:英文版,16.0(007),1629-1645.
MLA	SONG Dongri,et al."Debris flow impact on flexible barrier:effects of debrisbarrier stiffness and flow aspect ratio".山地科学学报:英文版 16.0.007(2019):1629-1645.