Material instabilities of anisotropic saturated multiphase porous media |
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| Institution: | 1. State Key Laboratory of Structural Analysis and Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, PR China;2. Department of Constructions and Transportations, University of Padua, Via Marzolo, 9-35131 Padova, Italy;1. Department of Computer Sciences, Vahap Kucuk Vocational School, Malatya Turgut Ozal University, Malatya, Turkey;2. Department of Digital Forensics Engineering, Technology Faculty, Firat University, Elazig, Turkey;3. Department of Computer Engineering, Engineering Faculty, Inonu University, Malatya, Turkey;1. Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway;2. Cátedra UNESCO/UNITWIN WiCop, Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Polígono Río San Pedro s/n, Puerto Real, Cádiz 11510, Spain;3. Department of Earth Sciences & Research Center on Natural Resources, Health and the Environment (RENSMA), Faculty of Experimental Sciences, University of Huelva, Campus ‘El Carmen’ s/n, 21071 Huelva, Spain;4. SINTEF Materials and Chemistry, Marine Environmental Technology, 7465 Trondheim, Norway;5. Norwegian University of Science and Technology, Department of Biology, 7491 Trondheim, Norway;1. Department of Geotechnical Engineering, Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, College of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China;2. Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL, USA |
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| Abstract: | This paper analyses the material instability of fully saturated multiphase porous media. On account of the fact that anisotropic mechanical behaviours are widely observed in saturated and partially saturated geomaterials, the anisotropic constitutive model developed by Rudnicki for geomaterials is used to model the anisotropic mechanical behaviour of the solid skeleton of saturated porous geomaterials in axisymmetric compression test. The inertial coupling effect between solid skeleton and pore fluid is also taken into account in dynamic cases. Conditions for static instability (strain localisation) and dynamic instability (stationary discontinuity and flutter instability) of fully saturated porous media are derived. The critical modulus, shear band angle for strain localisation, and the bound within which flutter instability may occur are given in explicit forms. The effects of material parameters on material instability are investigated in detail by numerical computations. |
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