An energy-based anisotropic damage model and its engineering application

In this paper, an anisotropic elasto-plastic damage model in strain space has been established to describe the behaviour of geomaterials under compression dominated stress fields and seepage fields. The research work focuses on rate-independent and small-deformation behaviour during isothermal processes. The salient features of geomaterials is fully defined in the starting points :(1) a second-order "fabric tensor" as the damage internal variable. (2) an equivalent state based on while the formulation is symmetric with respect to the sign of the stress/strain and (3) a general free energy function including the mechanisms of damage, plasticity, hydraulic fracturing and damage residual effects. The constitutive relations are developed in the well-established continuum mechanics, An one-parameter damage dependent elasticity tensor deduced based on tensorial algebra and thermodynamic requirements. Finally, the analyses of Kolnbrein arch dam, are presented.