Modeling Unsaturated Soil Column Collapse through Stabilized Updated Lagrangian Periporomechanics
Publication: Geo-Congress 2023
ABSTRACT
Soil column collapse has been widely studied in the dry condition due to its applicability to natural phenomena such as landslides, avalanches, and debris flows. Given the prevalence of unsaturated soils in nature, in this study, we apply a recently proposed nonlocal poromechanics formulation to study three-dimensional unsaturated soil column collapse. For accuracy and robustness in modeling large deformation and plasticity, an updated Lagrangian framework is adopted in which the equation of motion is formulated in the current/deformed configuration. Numerical simulations are conducted to explore the influence of aspect ratio of the column on the flow characteristics of unsaturated soil. The results are validated using experimental data of collapsed deposit morphology and final height. We also study the influence of initial matric suction in the soil on the final deposit shape.
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Geo-Congress 2023
Pages: 572 - 580
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Published online: Mar 23, 2023
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