On the constitutive modeling of partially saturated interfaces |
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| Institution: | 1. Pisarenko Institute for Problems of Strength, Timiryazevska Street 2, 01014 Kiev, Ukraine;2. Frantsevich Institute for Problems of Materials Science, Krzhizhanovsky Street 3, 03680 Kiev-142, Ukraine;1. University of Cagliari, DICAAR — Dept. of Civil and Environmental Engineering and Architecture, 2, via Marengo, I-09123 Cagliari, Italy;2. Technische Universität Dresden, Institut Statik und Dynamik der Tragwerke, D-01062 Dresden, Germany;1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China;2. Institute of Applied Mechanics, Graz University of Technology, Graz, 8010, Austria;1. University of Cambridge, Cambridge, United Kingdom;2. University of California, Berkeley, United States |
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| Abstract: | Generalization of soil–structure interface models from dry/saturated states to consider partially saturated states is studied in this paper. For this purpose, basic constitutive equations of a conventional elasto-plastic interface model are firstly presented. Then, consideration is given to the effect of partial saturation on definition of effective stress, location of the critical state line as well as the impact of interface state on plastic hardening modulus and dilatancy. For each concern, proper independent approaches together with associated constitutive equations are discussed to be included in the basic model as complementary ingredients. Among many different possibilities to combine complementary constitutive equations for effective stress, relocation of the critical state line with degree of saturation, and impact of the interface state on plastic hardening modulus and dilatancy, six essential cases are selected. Evaluations show that all six cases can realistically consider the impact of partial degree of saturation on the peak and residual shear strengths as well as the volume change behavior of unsaturated interfaces. |
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| Keywords: | Soil–structure interface Degree of saturation Effective stress Critical state Suction |
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