Kadivar, MehdiManahiloh, Kalehiwot NegaKaliakin, Victor N.2024-06-032024-06-032024-05-30Kadivar, Mehdi, Kalehiwot Nega Manahiloh, and Victor N. Kaliakin. 2024. "A Hyperelastic Bounding Surface Plasticity Model for Unsaturated Granular Soils" Geosciences 14, no. 6: 148. https://doi.org/10.3390/geosciences140601482076-3263https://udspace.udel.edu/handle/19716/34440This article was originally published in Geosciences. The version of record is available at: https://doi.org/10.3390/geosciences14060148. © 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).In this paper, a state-dependent, bounding surface plasticity model that simulates the behavior of unsaturated granular soils is presented. An unsaturated, soil mechanics-compatible elastoplastic response is adopted in which no part of the response occurs in a purely elastic fashion. To create an appropriate hydro-mechanical coupling, a newer generation stress framework, consisting of the Bishop-type effective stress and a second stress variable, is used in conjunction with a soil-water characteristic curve function. Details regarding the model development, parameter estimation, and assessment of the model’s predictive capabilities are outlined. With a single set of parameter values, the model realistically simulates the main features that characterize the shear and volumetric behavior of unsaturated granular soils over a wide range of matric suction, density, and net confining pressure.en-USAttribution 4.0 Internationalunsaturated granular soilconstitutive modelingbounding surface plasticitymatric suctionaxis translationhyperelasticitysoil water characteristic curveArticle