It is well known that classical continuum models for softening materials suffer from stability issues that lead to mesh dependent numerical solutions and their regularisation is needed for the analysis of boundary value problems. In this work, a Perzyna's type viscous regularisation was applied to a plasticity model for use with the Smoothed Particle Hydrodynamics (SPH) to analyse strain localisation in porous geomaterials. The proposed approach was first verified against an analytical solution for a plane strain compression test and then employed for the investigation of size dependent effects in localised failure of geomaterials. It is found that the proposed SPH-based approach, combined with visco-plastic constitutive relation, is an effective and simple way to capture both the onset and post-localisation behaviour.
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