MPM Coseismic Slope Runout Prediction Using the Intergranular Strain Anisotropy Hypoplastic Model
Publication: Geo-Congress 2024
ABSTRACT
The material point method (MPM) is an advanced particle-based numerical tool capable of modeling large deformations. However, its abilities to predict seismic site response, ground failure initiation, and post-failure consequences, including undrained conditions, have not been fully realized. This research aims to use recent MPM developments to simulate earthquake-triggered slope failures. As a novelty, an advanced constitutive model such as the intergranular strain anisotropy hypoplastic model is implemented in an effective-stress undrained MPM framework to simulate the hydromechanical response of dense and loose sand. First, an MPM simulation of a level-ground sand column is used to understand the system-level undrained response under simple sinusoidal excitation. Loose sand tends to liquefy under an increase in pore pressure, while dense sand exhibits a decrease in pore pressure. Second, a small-scale slope geometry is adopted whereby the runout investigation is conducted using void ratios ranging from 0.45 to 0.95. The framework shows promising system-level results, needing further validation using centrifuge experiments.
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Published online: Feb 22, 2024
ASCE Technical Topics:
- Analysis (by type)
- Anisotropy
- Business management
- Continuum mechanics
- Decision making
- Decision support systems
- Deformation (mechanics)
- Engineering fundamentals
- Engineering mechanics
- Failure analysis
- Geomechanics
- Geotechnical engineering
- Material mechanics
- Materials engineering
- Methodology (by type)
- Models (by type)
- Numerical methods
- Numerical models
- Practice and Profession
- Slopes
- Soil dynamics
- Soil mechanics
- Soil pressure
- Solid mechanics
- Strain
- Structural mechanics
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