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

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 quantitative...

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Bibliographic Details
Published in:Quarterly journal of engineering geology and hydrogeology 2021-05, Vol.54 (2)
Main Authors: Zhou Jiawen, Zhou Jiawen, Li Haibo, Li Haibo, Lu Gongda, Lu Gongda, Zhou Yue, Zhou Yue, Zhang Jieyuan, Zhang Jieyuan, Fan Gang, Fan Gang
Format: Article
Language:English
Subjects:
Asia
Avalanches
catastrophes
Catastrophic failure analysis
China
debris flows
Deformation
Engineering geology
Entrainment
erosion features
Far East
Field investigations
Field tests
Fluidizing
geologic hazards
Geomorphology
Guizhou China
hydrology
Hydrostatic pressure
Laboratory tests
Landslides
Lasers
Mass movement
mass movements
Mathematical models
moisture
natural hazards
numerical models
Numerical simulations
Pingdi China
Pore pressure
Pore water
Pore water pressure
Rain
Rainfall
Safety factors
Saturation
Shear strength
shear stress
shear tests
Shuicheng landslide
simulation
site exploration
slope stability
Slopes
soil mechanics
Soil water
Stability
Terrestrial environments
unconsolidated materials
Unmanned aerial vehicles
Water pressure
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Summary: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 (ru) 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 4.7×105 m3 at source area based on unmanned aerial vehicle (UAV) and terrestrial laser scanning (TLS) modeling techniques almost quadrupled eventually to more than 2.0×106 m3.
ISSN:1470-9236
2041-4803
DOI:10.1144/qjegh2020-052