Abstract
A constitutive model formulated within the framework of the multilaminate concept for soils is presented. It is shown that anisotropic material behaviour is easily accounted for with these types of models. The potential of the formulation to predict plastic volumetric strains purely caused by rotation of principal stress axes is demonstrated. Furthermore the model is able to capture the formation of shear bands due to an enhanced strain softening formulation including both frictional and cohesive softening behaviour. Due to a simple regularisation technique mesh independent results are obtained with sufficient accuracy for practical purposes. The latter feature will be highlighted by solving the practical problem of a shallow tunnel excavation constructed using the principles of the NATM. It is shown that the development of plastic shear strains leading to a failure mechanism that involves shear banding is realistically predicted by the proposed formulation.
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Schweiger, H.F., Schuller, H. (2003). A multilaminate model for finite element analysis of tunnel excavation. In: Beer, G. (eds) Numerical Simulation in Tunnelling. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6099-2_13
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DOI: https://doi.org/10.1007/978-3-7091-6099-2_13
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