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Initiation mechanism and quantitative mass movement analysis of the 2019 Shuicheng catastrophic landslide

Zhou Jiawen, Li Haibo, Lu Gongda, Zhou Yue, Zhang Jieyuan and Fan Gang
Initiation mechanism and quantitative mass movement analysis of the 2019 Shuicheng catastrophic landslide
Quarterly Journal of Engineering Geology and Hydrogeology (September 2020) 54 (2)

Abstract

The Shuicheng landslide is a typical failure occurred in the slope deposits that has a close correlation with the antecedent rainfall. By using field investigation, laboratory tests and numerical simulations, the initiation mechanism was analyzed and the mass movement characteristic was quantitatively assessed. The numerical results indicated that the rainfall infiltration decreased the shear resistance of the slope and increased pore water pressure and soil weight, resulting in large deformation of the slope and gradual deterioration of its stability. After saturated, as the pore water pressure coefficient (r (sub u) ) approached to 0.3, the overall safety factor dropped down to 1, and the failure eventually occurred. Quantitative mass assessment demonstrated that the unique terrain aggravated the erosion and entrainment effect, the inclusion of loose material and water promoted the moving state of the debris avalanche by transiting it into a fluidized state, resulting in a much larger landslide volume with a long runout distance. As a result, the volume of the failed mass which was calculated to be about 4.7X10 (super 5) m (super 3) at source area based on unmanned aerial vehicle (UAV) and terrestrial laser scanning (TLS) modeling techniques almost quadrupled eventually to more than 2.0X10 (super 6) m (super 3) .


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 54
Serial Issue: 2
Title: Initiation mechanism and quantitative mass movement analysis of the 2019 Shuicheng catastrophic landslide
Affiliation: Sichuan University, Laboratory of Hydraulics and Mountain River Engineering, Chengdu, China
Published: 20200916
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 42
Accession Number: 2020-079531
Categories: Engineering geologyGeomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N26°24'55" - N26°24'55", E104°52'14" - E104°52'14"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202048
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