A CASM-X constitutive model for unsaturated soils and its application to model wetting-induced slope collapse using SPH

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dc.contributor.authorNguyen, D.T.
dc.contributor.authorBui, H.H.
dc.contributor.authorLian, Y.
dc.contributor.authorNguyen, T.T.
dc.contributor.authorNguyen, G.D.
dc.contributor.authorBouazza, A.
dc.date.issued2025
dc.description.abstractMesh-free methods, such as the Smooth Particle Hydrodynamics (SPH) method, have recently been successfully developed to model the entire wetting-induced slope collapse process, such as rainfall-induced landslides, from the onset to complete failure. However, the latest SPH developments still lack an advanced unsaturated constitutive model capable of capturing complex soil behaviour responses to wetting. This limitation reduces their ability to provide detailed insights into the failure processes and to correctly capture the complex behaviours of unsaturated soils. This paper addresses this research gap by incorporating an advanced unsaturated constitutive model for clay and sand (CASM-X) into a recently proposed fully coupled seepage flow-deformation SPH framework to simulate a field-scale wetting-induced slope collapse test. The CASM-X model is based on the unified critical state constitutive model for clay and sand (CASM) and incorporates a void-dependent water retention curve and a modified suction-dependent compression index law, enabling the accurate prediction of various unsaturated soil behaviours. The integration of the proposed CASM-X model in the fully coupled flowdeformation SPH framework enables the successful prediction of a field-scale wetting-induced slope collapse test, providing insights into slope failure mechanisms from initiation to post-failure responses.
dc.description.statementofresponsibilityDinh-Tai Nguyen, Ha H. Bui, Yanjian Lian, Thang T. Nguyen, Giang D. Nguyen, Abdelmalek Bouazza
dc.identifier.citationComputers and Geotechnics, 2025; 186:107353-1-107353-29
dc.identifier.doi10.1016/j.compgeo.2025.107353
dc.identifier.issn0266-352X
dc.identifier.issn1873-7633
dc.identifier.urihttps://hdl.handle.net/2440/147963
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/DP190102779
dc.relation.granthttp://purl.org/au-research/grants/arc/FT200100884
dc.relation.granthttp://purl.org/au-research/grants/arc/DP240102765
dc.relation.granthttp://purl.org/au-research/grants/arc/LP220200792
dc.rights© 2025 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/bync/4.0/).
dc.source.urihttps://doi.org/10.1016/j.compgeo.2025.107353
dc.subjectWetting-induced slope collapse; Unsaturated soil constitutive model; CASM-X; Smoothed Particle Hydrodynamics (SPH); Coupled flow-deformation; Large deformation
dc.titleA CASM-X constitutive model for unsaturated soils and its application to model wetting-induced slope collapse using SPH
dc.typeJournal article
pubs.publication-statusPublished

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