On evaluating the stability of the Baiyian ancient landslide in the Three Gorges Reservoir area,Yangtze River: a geological history analysis |
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Authors: | Xiao Li Qiulin Liao Sijing Wang Jishan Liu Souting Lee |
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Institution: | (1) Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;(2) School of Oil and Gas Engineering, The University of Western Australia, Crawley, Australia |
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Abstract: | Numerous landslides have occurred during the construction of the Three Gorges Reservoir of the Yangtze River. Although the
underlying causal factor of these landslides was heavy rainfall, the construction process was the trigger of some of them.
We report here a systematic study aimed at reconstructing the geological history of an ancient landslide and, based on our
results, an evaluation of the role of the history on current landslide stability. Data from detailed field surveys and the
studies on geological dating revealed that the Baiyian landslide was composed of five structural parts of different geological
ages, such as a sliding belt, disturbed rocks, ancient colluvium, alluvium of the Yangtze River and slope wash. The succession
of ancient climates, terraces and tectonic processes in the study area were examined from 300 ka ago. The evolutionary history
of the Baiyian ancient landslide can be divided into five distinct stages: development, occurrence, deposition, collapse and
disintegration. Some parts of the ancient landslide are currently prone to instability due to the combination effects of heavy
rainfall and construction of the reservoir. |
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Keywords: | Ancient landslide Evolution Geology dating Geological history Stability Three Gorges |
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