Deformation characteristics and reactivation mechanisms of the Outang ancient landslide in the Three Gorges Reservoir, China

2020 ◽  
Vol 79 (8) ◽  
pp. 3943-3958 ◽  
Author(s):  
Shi-Lin Luo ◽  
Da Huang
Keyword(s):  
Three Gorges Reservoir ◽  
Deformation Characteristics ◽  
Three Gorges ◽  
Ancient Landslide ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

Field monitoring and deformation characteristics of a landslide with piles in the Three Gorges Reservoir area

Landslides ◽  
2018 ◽  
Vol 15 (3) ◽  
pp. 581-592 ◽  
Author(s):  
Yuming Zhang ◽  
Xinli Hu ◽  
Dwayne D. Tannant ◽  
Guangcheng Zhang ◽  
Fulin Tan
Keyword(s):  
Three Gorges Reservoir ◽  
Field Monitoring ◽  
Three Gorges Reservoir Area ◽  
Deformation Characteristics ◽  
Three Gorges ◽  
Reservoir Area ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

scholarly journals Stability Analysis of the Shiliushubao Landslide Based on Deformation Characteristics and External Trigger Factors in the Three Gorges Reservoir

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Guilin Luo ◽  
Guangming Ren ◽  
Xiaojun Bao ◽  
Xili Yang ◽  
Teng Liu
Keyword(s):  
Stability Analysis ◽  
Three Gorges Reservoir ◽  
Seasonal Fluctuation ◽  
Deformation Characteristics ◽  
Three Gorges ◽  
Trigger Factors ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Landslide Mass ◽  
The Stability

There exists the problem of landslide reactivation due to the seasonal fluctuation of rainfall and reservoir water level annually. Based on a large number of GPS monitoring data of the landslide mass after impoundment of the Three Gorges Reservoir in Shiliushubao landslide area, the relationship between the external trigger factors and slope stability could be obtained. A finite element calculation model has been established for the stability analysis of the Shiliushubao landslide after impoundment from January 2004 to October 2009. Through the deformation characteristics of the landslide, it is shown that the landslide exhibited a stepwise pattern on the whole, which developed faster after impoundment and slowed down in rainy seasons. The trend of the curve kept roughly opposite to the fluctuation of the safety factor. It suggested that the stability of the landslide mass was closely related to the seasonal fluctuation of the rainfall and the reservoir level, and the landslide deposits demonstrated to be reactive with them. The subject provides a certain reference value on the landslide stability analysis and the risk assessment within a similar engineering geological condition.

scholarly journals Formation of a multi-translational reactivated ancient landslide in the Three Gorges Reservoir, China

2019 ◽  
Author(s):  
Shilin Luo ◽  
Xiaoguang Jin ◽  
Da Huang ◽  
Tantan Zhu
Keyword(s):  
Formation Mechanism ◽  
Three Gorges Reservoir ◽  
Slip Surface ◽  
Evolutionary Process ◽  
Water Levels ◽  
Material Structure ◽  
Three Gorges ◽  
Ancient Landslide ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

Abstract. The fluctuation of water levels and seasonal rainfall in a reservoir may induce various types of slope movements. Some of these movements are new, whereas others are old but reactivated. The primary aim of this study is to investigate the formation mechanism and process, deposit characteristics, and identification signs of a giant multi-translational reactivated ancient landslide in the Three Gorges Reservoir region based on field observations, on-site surveys, and Electron Spin Resonance experiments. The Outang landslide, located at the south bank of the Yangtze River, has a total volume of approximately 90 million m3 and can been divided into three independent subzones with an apparent age of 120–130 ka (ka represents a thousand years) for subzone O1, 65–68 ka for subzone O2, and 47–49 ka for subzone O3. The features of mobilized material structure and slip surface morphology in each subzone are similar and are in the form of a spoon. A conceptual model, including sliding, bending, suspending, and accumulating, is deduced to explain the formation mechanism and evolutionary process of this instability. Three types of evidences are proposed to recognize the ancient landslide. Currently, landslide stability is obscure based on the significant landslide movement and reactivated features; more attention and long-term monitoring is necessary in the future.

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