Formation mechanism of a rainfall triggered complex landslide in southwest China

doi:10.1016/j.jhydrol.2020.125124

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.5

	Formation mechanism of a rainfall triggered complex landslide in southwest China
	Huang, Qiu-xiang; Xu, Xiang-tao; Kulatilake, P. H. S. W.; Lin, Feng
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2020
卷号	17 期号:5 页码:125124
关键词	Complex landslide Man-made fill Shale formation Lateral shear failure Conceptual model
ISSN号	1672-6316
DOI	10.1016/j.jhydrol.2020.125124
文献子类	Article
英文摘要	This case study is about a landslide that occurred after 4 days of heavy rainfall, in the morning of June 29, 2012, in Cengong County, Guizhou Province of China, geographical coordinated 108 degrees 20 '-109 degrees 03 ' E, 27 degrees 09 '-27 degrees 32 ' N, with an estimated volume of 3.3x10(6) m(3). To fully investigate the landslide process and formation mechanism, detailed geotechnical and geophysical investigations were performed including borehole drilling, sampling, and laboratory tests coupled with monitoring of displacement. Also, a combined seepage-slope stability modeling was performed to study the behavior of the landslide. After the heavy rainfall event, the sliding process started in this area. The landslide development can be divided into different parts. The man-made fill area, spatially distributed in the south side of the landslide area with low elevations, slid first along the interface between the slope debris and the strongly weathered bedrock roughly in the EW direction. Consequently, due to severe lateral shear disturbance, the slope in the main sliding zone slid next towards the SW direction, along the sliding surface developed within the strongly weathered calcareous shale formation located at a depth of 25-35 m. This means it was a rainfall triggered deep-seated landslide. Finally, retrogressive failure of a number of upstream blocks occurred, which moved in more than one direction. The initial failure of the man-made fill area was the 'engine' of the whole instability framework. This artificial material with low permeability, piled up in the accumulation area of surface and sub-surface and destroyed the drainage capacity of the groundwater. The numerical modeling results agreed with the analysis results obtained from the laboratory and field investigations. A conceptual model is given to illustrate the formation mechanism and development process of the landslide.
电子版国际标准刊号	1879-2707
语种	英语
WOS记录号	WOS:000568830400012
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/46820]
专题	Journal of Mountain Science_Journal of Mountain Science-2020_Vol17 No.5
推荐引用方式 GB/T 7714	Huang, Qiu-xiang,Xu, Xiang-tao,Kulatilake, P. H. S. W.,et al. Formation mechanism of a rainfall triggered complex landslide in southwest China[J]. JOURNAL OF MOUNTAIN SCIENCE,2020,17(5):125124.
APA	Huang, Qiu-xiang,Xu, Xiang-tao,Kulatilake, P. H. S. W.,&Lin, Feng.(2020).Formation mechanism of a rainfall triggered complex landslide in southwest China.JOURNAL OF MOUNTAIN SCIENCE,17(5),125124.
MLA	Huang, Qiu-xiang,et al."Formation mechanism of a rainfall triggered complex landslide in southwest China".JOURNAL OF MOUNTAIN SCIENCE 17.5(2020):125124.