https://hal-univ-pau.archives-ouvertes.fr/hal-02153318Hu, RanRanHuLiu, Hui-HaiHui-HaiLiuESD - Earth Science Division [LBNL Berkeley] - LBNL - Lawrence Berkeley National Laboratory [Berkeley]Chen, YifengYifengChenPeking University [Beijing]State Key Laboratory of Mathematical Engineering and Advanced ComputingZhou, ChuangbingChuangbingZhouGallipoli, DomenicoDomenicoGallipoliSIAME - Laboratoire des Sciences de l'Ingénieur Appliquées à la Mécanique et au génie Electrique - UPPA - Université de Pau et des Pays de l'AdourA Constitutive Model for Unsaturated Soils with Consideration of Inter-Particle BondingHAL CCSD2014[PHYS] Physics [physics]Labo, SIAME2019-06-12 10:26:202022-09-02 11:54:052019-06-12 10:26:20enJournal articles10.1016/j.compgeo.2014.03.0071The paper presents a physically-based constitutive model for unsaturated soils that considers the bonding effect of water menisci at inter-particle contacts. A bonding factor has been used to represent the magnitude of the equivalent bonding stress, defined as the bonding force per unit cross-sectional area. The average skeleton stress is employed to represent the effect of average fluid pressures within soil pores. Based on an empirical relationship between the bonding factor ζ and the ratio e/es (where e and es are void ratios at unsaturated and saturated states, respectively, at the same average skeleton stress), we propose an elasto-plastic constitutive model for isotropic stress states, and then extend this model to triaxial stress states within the framework of critical state soil mechanics. Because only one yield surface is needed in the proposed model, a relatively small number of parameters are required. Comparisons between experimental data and model results show that, in most cases, the proposed model can reasonably capture the important features of unsaturated soil behavior. \textcopyright 2014 Elsevier Ltd.