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This paper presents an extension of the discrete element method using aphase-field formulation to incorporate grain shape and its evolution. Theintroduction of a phase variable enables an effective representation of graingeometry and facilitates the application of physical laws, such aschemo-mechanical couplings, for modeling shape changes. These physical laws aresolved numerically using the finite element method coupled in a staggeredscheme to the discrete element model. The efficacy of the proposed Phase-FieldDiscrete Element Model (PFDEM) is demonstrated through its ability toaccurately capture the real grain shape in a material subjected to dissolutiononly and compute the stress evolution. It is then applied to model thephenomenon of pressure solution involving dissolution and precipitation ingranular materials at the microscale and enables to reproduce the creepresponse observed experimentally. This framework contributes to the enhancedunderstanding and simulation of complex behaviors in granular materials andsedimentary rocks for many geological processes like diagenesis or earthquakenucleation.

A Phase-Field Discrete Element Method to study chemo-mechanical coupling in granular materials