A constitutive model for unsaturated soils with consideration of inter-particle bonding |
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| Institution: | 1. School of Civil Engineering, University of Leeds, UK;2. Mechanical Engineering Department, Universiti Teknologi PETRONAS, Block 17.03.10, Bandar Seri Iskandar, 31750 Tronoh, Perak Darul Ridzuan, Malaysia\n;3. Groundwater Protection and Restoration Group, Department of Civil and Structural Engineering, The University of Sheffield, UK;4. National Nuclear Laboratory, Chadwick House, Birchwood Park, Warrington WA3 6AS, UK |
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| Abstract: | The 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. |
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| Keywords: | Constitutive model Unsaturated soils Bonding effect Water menisci Plasticity Critical state |
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