Characteristics and failure mechanism of the 2018 Yanyuan landslide in Sichuan, China

This paper reports on a recent landslide event, which occurred in Yanyuan County at Xichang City, Sichuan Province, China, on 19 July 2018. Due to the continuous and heavy rainfall between 8 July 2018 and 18 July 2018, approximately 18 million m 3 of soil detached from an ancient landslide and burie...

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Bibliographic Details
Published in:Landslides 2019-12, Vol.16 (12), p.2433-2444
Main Authors: Zhu, Lei, Deng, Yu, He, Siming
Format: Article
Language:English
Subjects:
Aerial photography
Agriculture
Civil Engineering
Earth and Environmental Science
Earth Sciences
Failure mechanisms
Field investigations
Field tests
Geography
Heavy rainfall
Historical buildings
Illustrations
Landslides
Landslides & mudslides
Movement
Natural Hazards
Photography
Rain
Rainfall
Recent Landslides
Sliding
Slumping
Soil
Unmanned aerial vehicles
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Summary:This paper reports on a recent landslide event, which occurred in Yanyuan County at Xichang City, Sichuan Province, China, on 19 July 2018. Due to the continuous and heavy rainfall between 8 July 2018 and 18 July 2018, approximately 18 million m 3 of soil detached from an ancient landslide and buried 65 buildings, the entire sliding process lasted for several minutes. Here, based on field investigations and unmanned aerial vehicle (UAV) photography, we describe the characteristics and failure mechanism of this landslide. The results showed that the landslide was triggered by the continuous and heavy rainfall. Additionally, during the first post-failure stage, the motion of this landslide involved typical successive movement, and over time, the style of movement progressively turned flow-like, which can be classified as debris slide by using the 1978 Varnes classification scheme. The landslide event described here is an outstanding case for landslide studies. In particular, this landslide represents a good illustration of the transform mechanism of landslide movement from sliding to flow-like.
ISSN:1612-510X
1612-5118
DOI:10.1007/s10346-019-01262-z