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An Elasto‐Plastic Formulation of a Soil‐Foundation Interface

In this paper, a special interface formulation for the continuum mechanical description of the contact zone between soil and geotechnical foundation is presented. The proposed model is based on the Theory of Porous Media (TPM), a consistent approach to describe geomaterials in a macroscopic frame [1]. Assuming quasi‐static conditions, strains in the porous soil body are due to an elasto‐plastic work‐hardening model, whereas the constitutive properties of the interface are based on the continuous elasto‐plastic behaviour of the soil body and on the failure kinematics of the contact zone. Using the FE method, a 3‐d initial‐boundary‐value problem of a soil‐foundation interaction is discussed with a close look on the occurring localization phenomenon.