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Indexed by:期刊论文

Date of Publication:2005-09-01

Journal:EUROPEAN JOURNAL OF MECHANICS A-SOLIDS

Included Journals:SCIE、EI、Scopus

Volume:24

Issue:5

Page Number:713-727

ISSN No.:0997-7538

Key Words:porous medium; anisotropy; strain localisation; stationary discontinuity; flutter instability

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. (c) 2005 Elsevier SAS. All rights reserved.