Journal
Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.proeps.2014.06.018
Keywords
Preferential flow; Dual-permeability model; local factor of safety; slope stability analysis; COMSOL Multiphysics
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Preferential flow paths, such as cracks, macropores, fissures, pipes etc. are common features of highly heterogeneous slopes. During intense rainstorms, preferential flow has a significant influence on subsurface flow and slope stability. Dual-permeability models are widely used to simulate preferential flow, but have not been incorporated into hydro-mechanical models. In this study, the COMSOL Multiphysics software was used to couple a dual-permeability model with a soil mechanics model for landslide stability evaluation on a hillslope scale with examples of up to 100m spatial scale. Detailed information is provided on how to incorporate current hydrological and soil mechanics theories into COMSOL. The model is benchmarked against two existing solutions and is applied to evaluate the effect of preferential flow on slope stability as an example. (C) 2014 Elsevier B.V.
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