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Three-dimensional Cosserat continuum modeling of fractured rock masses

Ioannis Stefanou 1, 2, * Jean Sulem 3 
* Auteur correspondant
2 msa - Matériaux et Structures Architecturés
navier umr 8205 - Laboratoire Navier
3 cermes - Géotechnique
navier umr 8205 - Laboratoire Navier
Abstract : The behavior of rock masses is influenced by the existence of discontinuities, which divide the rock in joint blocks making it an inhomogeneous anisotropic material. From the mechanical point of view, the geometrical and mechanical properties of the rock discontinuities define the mechanical properties of the rock structure. In the present paper we consider a rock mass with three joint sets of different dip angle, dip direction, spacing and mechanical properties. The dynamic behavior of the discrete system is then described by a continuum model, which is derived by homogenization. The homogenization technique applied here is called generalized differential expansion homogenization technique and has its roots in Germain's (1973) formulation for micromorphic continua. The main advantage of the method is the avoidance of the averaging of the kinematic quotients and the derivation of a continuum that maps exactly the degrees of freedom of the discrete system through a one-to-one correspondence of the kinematic measures. The derivation of the equivalent continuum is based on the identification for any virtual kinematic field of the power of the internal forces and of the kinetic energy of the continuum with the corresponding quantities of the discrete system. The result is an anisotropic three-dimensional Cosserat continuum. © 2010 Imperial College Press.
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Soumis le : mardi 17 avril 2012 - 13:09:20
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Ioannis Stefanou, Jean Sulem. Three-dimensional Cosserat continuum modeling of fractured rock masses. Journal of Multiscale Modeling, 2010, 2 (3-4), pp.217-234. ⟨10.1142/S1756973710000424⟩. ⟨hal-00688316⟩



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