Channelized and unchannelized collapses of granular columns on a horizontal surface

doi:10.1007/s11629-020-6021-7

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-2020 > Vol17 No.12

	Channelized and unchannelized collapses of granular columns on a horizontal surface
	Zhang Quan; Huang Bo-lin; Zhao Hai-lin; Chen Xiao-ting; Luo Chao-lin
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2020
卷号	17 期号:12 页码:2982-2996
关键词	Granular column Unchannelized collapses flows Energy conversion Energy dissipation Deposition prediction Gravity height Deposition angle
ISSN号	1672-6316
DOI	10.1007/s11629-020-6021-7
英文摘要	Columnar dangerous rock mass is widely developed in many high and steep mountain areas around the world. It often collapses, disintegrates and produces debris flow, which is disastrous. The collapse process of the columnar dangerous rock mass is very similar to the collapse of granular column. In this paper, we report the results of an experimental investigation of the flow induced by the collapse of a column of granular material over a horizontal surface. Two different setups are used, namely, a channelized granular column collapse (i.e., two-dimensional) and an unchannelized granular column collapse (i.e., three-dimensional), allowing us to compare channelized and unchannelized collapses flows. The experimental data suggest that our experimental findings were markedly different from those reported by previous authors (i.e., include the channelized and unchannelized collapse flows showed differences in energy conversion and dissipation). In channelized collapse flows, the maximum vertical speed appears in the free fall regime, while, the maximum speed in the vertical direction of unchannelized collapse flows appears in the spreading regime. During the whole collapse process, i.e., in channelized and unchannelized collapse flows, the conversion of potential energy and kinetic energy does not occur uniformly, and the maximum kinetic energy of the channelized collapse flows is higher than that of the unchannelized collapse flows, and compared with the unchannelized collapse flows, the dissipation energy in the channelized collapse flows is lower. A series of experiments was performed to predict the behaviour of different granular columns (characterized by different initial aspect ratio (a), varying from 1 to 4). The data obtained from 2D experimental model and 3D experimental model have certain amount of difference, such as the particle runout distance (d(1)), the maximum central height (h(2)), and the deposition angle (i.e., beta(1), beta(2)). These differences show that the 2D experimental model does not fully represent the 3D conditions (i.e., the role of side-walls on the channelized collapse flows characteristic is non-negligible). Accordingly, care must be taken when validating 3D models with 2D experimental data. The movement of the tower dangerous rock masses with collapse failure mode could be evaluated using this channelized and unchannelized granular column experimental results.
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/57074]
专题	Journal of Mountain Science_Journal of Mountain Science-2020_Vol17 No.12
推荐引用方式 GB/T 7714	Zhang Quan,Huang Bo-lin,Zhao Hai-lin,et al. Channelized and unchannelized collapses of granular columns on a horizontal surface[J]. JOURNAL OF MOUNTAIN SCIENCE,2020,17(12):2982-2996.
APA	Zhang Quan,Huang Bo-lin,Zhao Hai-lin,Chen Xiao-ting,&Luo Chao-lin.(2020).Channelized and unchannelized collapses of granular columns on a horizontal surface.JOURNAL OF MOUNTAIN SCIENCE,17(12),2982-2996.
MLA	Zhang Quan,et al."Channelized and unchannelized collapses of granular columns on a horizontal surface".JOURNAL OF MOUNTAIN SCIENCE 17.12(2020):2982-2996.