Leforta, Vincent (LFC-R, UMR5150, University Pau & Pays Adour) | Gr&$233;goirea, David (LFC-R, UMR5150, University Pau & Pays Adour) | Grasslb, Peter (University of Glasgow) | Pijaudier-Cabota, Gilles (LFC-R, UMR5150, University Pau & Pays Adour)
Characterizing the change of the transport properties during the propagation of macrocracks in a quasi-brittle material (rocks, hard soils,…) is one of the challenges of current research on hydraulic fracturing. Analyzing such change of properties is a way to determine the extent of the Stimulated Reservoir Volume (SRV). The degradation of quasi-brittle materials encompasses micro-crack propagation, interaction and coalescence in order to form a macro-crack. These phenomena are located progressively within the so-called Fracture Process Zone (FPZ). The shape and growth of the FPZ, and its interaction with boundaries, lead to typical phenomena such as size effects, boundary effects and shielding effects. In this paper, we consider synthetic quasi-brittle materials (mortar or concrete) that mimic the mechanical behavior of natural rock, and develop analysis tools based on mesoscale simulations that enable the study of characteristic lengths during damage and failure of such materials.