Postfailure Characterization of Shallow Landslides Using the Material Point Method

Although the mechanisms of slope failure caused by rising groundwater have been widely investigated, the kinematic behavior of landslides in the postfailure stage, which contains essential information for hazard mitigation and risk assessment, has not yet been fully studied. Thus, in this study, a s...

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Bibliographic Details
Published in:Geofluids 2021, Vol.2021, p.1-25
Main Authors: Nguyen, Thanh Son, Yang, Kuo-Hsin, Ho, Chia-Chun, Huang, Feng-Chi
Format: Article
Language:English
Subjects:
Compression
Deformation
Distance
Edge dislocations
Flumes
Groundwater
Groundwater levels
Groundwater table
Hazard mitigation
Hydrology
Kinematics
Landslides
Landslides & mudslides
Mechanical properties
Methods
Mitigation
Numerical analysis
Numerical simulations
Parameters
Permeability
Risk assessment
Saturated soils
Shear
Shear bands
Shearing
Simulation
Slopes
Soil
Soil conditions
Soil dynamics
Soil mechanics
Soil permeability
Velocity
Viscosity
Water table
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Summary:Although the mechanisms of slope failure caused by rising groundwater have been widely investigated, the kinematic behavior of landslides in the postfailure stage, which contains essential information for hazard mitigation and risk assessment, has not yet been fully studied. Thus, in this study, a series of numerical simulations using the material point method (MPM) were conducted to analyze the kinematic behavior and soil movement of shallow landslides (infinite slope problems). First, the proposed MPM formulation was validated in a full-scale landslide flume test. The simulated results of final slope profile, runout distance, deposit height, shear band development, slope displacement, and velocity accorded with the experimental results, suggesting that the MPM can quantitatively simulate large deformations. A parametric study of shallow slopes with various hydrological conditions and soil hydraulic and soil mechanical parameters was then performed to assess the influence of the aforementioned factors on landslide kinematics. The simulation results indicated that mechanical behavior at the slope toe is complex; the multiple plastic shear bands generated at the slope toe were due to a combination of shearing and compression. The deposition profile of the slopes was significantly influenced by all input parameters. Among the aforementioned parameters, soil cohesion, location of the groundwater table, and saturated soil permeability most greatly affected runout distance in the sensitivity assessment. Soil friction angle had a minor influence on the kinematic behavior of the slope.
ISSN:1468-8115
1468-8123
DOI:10.1155/2021/8860517