High mobility of rock-ice avalanches: Insights from small flume tests of gravel-ice mixtures

doi:10.1016/j.enggeo.2019.105260

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

	High mobility of rock-ice avalanches: Insights from small flume tests of gravel-ice mixtures
	Yang Qingqing 1,2; Su Zhiman 3; Cheng Qiangong 1,2; Ren Yuhao 1; Cai Fei 4
刊名	ENGINEERING GEOLOGY
	2019
卷号	260 页码:UNSP 105260
关键词	Rock-ice avalanche Run-out distance Ice content Flume test
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2019.105260
通讯作者	Cheng, Qiangong(chengqiangong@home.swjtu.edu.cn)
产权排序	3
文献子类	Article
英文摘要	Rock-ice avalanches in cold high-mountain regions have extremely high mobility and enormous destructive potential. As a special material component, ice is supposed to play a crucial role in enhancing the mobility of rock-ice avalanches. A series of small flume tests was performed to quantify the influence of the ice content, initial arrangement, and released mass on the behavior and mobility of gravel-ice mixtures, and to provide insights into the propagation mechanisms of rock-ice avalanches in their initial phase. Test results show that the run-out distance and abrupt-stopping distance increased significantly when the ice content reached 30%. This implies that a certain amount of ice was helpful in enhancing the mobility of rock-ice avalanches. With an ice content higher than 80%, the run-out distances decreased slightly. The run-out distance in the well-mixed case was greater than that in the layered-arrangement cases. Segregation, the phenomenon of ice cubes to tend toward the surface and front of the deposit, was vital for the mobility of gravel-ice mixtures. Segmentation was much more evident with an increase in ice content, which indicates that the deposit was highly dispersed and spreading. This was a key difference in the deposition morphology between cases of gravel-ice mixture and cases of pure gravel or pure ice. Although little meltwater was generated in this study, the development of intergranular water film and suction-induced cohesion caused the particles to pack more closely together and to act as clusters rather than individual particles. This study provides insights into the propagation mechanisms and deposition characteristics of rock-ice avalanches.
电子版国际标准刊号	1872-6917
资助项目	National Natural Science Foundation of China[41761144080] ; National Natural Science Foundation of China[41530639] ; National Natural Science Foundation of China[41402244] ; National Natural Science Foundation of China[2019QZKK0906]
WOS关键词	MONT-BLANC MASSIF ; GRANULAR AVALANCHES ; RUNOUT ; LANDSLIDE ; GLACIER ; VELOCITY ; FLOW ; MECHANISMS ; MOUNTAINS ; HUASCARAN
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000495469800033
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/33570]
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	Cheng Qiangong
作者单位	1.Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 610031, Sichuan, Peoples R China; 2.Southwest Jiaotong Univ, MOE Key Lab High Speed Railway Engn, Chengdu 610031, Sichuan, Peoples R China; 3.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China; 4.Gunma Univ, Dept Civil & Environm Engn, Kiryu, Gumma 3768515, Japan
推荐引用方式 GB/T 7714	Yang Qingqing,Su Zhiman,Cheng Qiangong,et al. High mobility of rock-ice avalanches: Insights from small flume tests of gravel-ice mixtures[J]. ENGINEERING GEOLOGY,2019,260:UNSP 105260.
APA	Yang Qingqing,Su Zhiman,Cheng Qiangong,Ren Yuhao,&Cai Fei.(2019).High mobility of rock-ice avalanches: Insights from small flume tests of gravel-ice mixtures.ENGINEERING GEOLOGY,260,UNSP 105260.
MLA	Yang Qingqing,et al."High mobility of rock-ice avalanches: Insights from small flume tests of gravel-ice mixtures".ENGINEERING GEOLOGY 260(2019):UNSP 105260.