Hypoplastic Interface Model (Stutz et al., 2016)
Modelling of interfaces in geotechnical engineering is an important issue. Interfaces between structural elements (e.g. anchors, piles, tunnel-linings) and soils are widely used in geotechnical engineering. This model is an enhanced hypoplastic interface model that incorporates the in-plane stresses at the interface. To this aim, a general approach to convert the existing hypoplastic model with a predefined limit state surface for sands into an interface model was developed. This was achieved by adopting reduced stress and stretching vectors and redefining tensorial operations, which could be used in the existing continuum model with few modifications. The new enhanced model is giving improved predictions by the incorporation of in-plane stresses into the model formulation.