H.F. Schweiger, V. Galavi
Computational Geotechnics Group, Institute for Soil Mechanics and Foundation Engineering, Graz University of
Technology, Austria:
F. Scharinger
GDP Consulting Engineers, Graz, Austria
Keywords: constitutive modelling, finite element method, anisotropy, small strain stiffness
ABSTRACT:
Constitutive models based on the multilaminate framework provide an alternative framework to more common formulations in terms of stress invariants. The basic feature of multilaminate models, namely the consideration of various integration planes to formulate the stress-strain relationship has the advantage that yield criteria, flow and hardening rules are formulated on planes rather than in three-dimensional stress space making the mathematics simpler. Stress or strain induced anisotropy is an intrinsic feature of these models and inherent anisotropy can be introduced by means of a structural tensor which allows the input of orientation dependent
strength properties. A number of different constitutive equations for modelling clays and sands based on the multilaminate framework have been presented in the literature and more recently advanced formulations including small strain stiffness effects or non-local softening behaviour have been developed. In this paper only a very brief summary of the multilaminate model used for the analyses presented in this paper is given. The emphasis is then put on practical applications. First results for slope stability analyses are shown where the consequences of
anisotropic strength are highlighted and secondly the influence of considering small strain stiffness effects when simulating a tunnel excavation is discussed.
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