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For a single soilbag filled with a cohesionless granular material
analytical and numerical models based on a continuum approach are used
to predict the evolution of deformation and stress under monotonic
compression and plane strain conditions. Analytical models with
different assumptions for the stress ratio distribution in the filling
material, a constant volume and a frictionless interface between the
soil and the wrapping bag are studied. In order to evaluate the
simplifications assumed for the analytical model numerical simulations
are carried out with a micro-polar hypoplastic model for the soil
behavior and an elastic-ideally plastic model for the wrapping material.
Particular attention is paid to the influence of the interface behavior
between the soil and the bag material on the evolution of the state
quantities. Herein the special cases of a frictionless interface and an
interlocked interface are investigated. In contrast to the frictionless
interface, the tensile stress in the wrapping bag material in the case
of the interlocked interface is not homogeneous from the beginning of
loading. Furthermore, the assumed interface behavior influences the
evolution of the state quantities and the location of zones with intense
strain localization of the granular material. The investigation with an
initially random distribution of the void ratio of the granular
material only shows an earlier onset of strain localization.