Modeling porous rock fracturing induced by fluid injection

摘要: Abstract In this paper, we describe and implement a theoretical model that captures the physical processes occurring during hydraulic fracturing of saturated unsaturated, porous rock. The is based on poro-elastic–plastic rheology with Mohr–Coulomb yield function unassociated flow rule, includes frictional hardening, cohesion weakening, damage mobilized dilatancy effects. addition, fluid injection described using Richard׳s approximation. We numerically finite difference scheme staggered grid, compare results laboratory experiments published in Stanchits et al. (2011) [ 16 ]. From various performed by al., use three different configurations for comparing our observations: (a) triaxial compression drained rock sample, (b) low pressure into drained, critically stressed rock, (c) high sample. find good agreement between observations all cases, indicating proper formulation implementation dominant mechanisms acting. reproduces experimental macroscopic fracture, front localization, stress–strain response curves. Matching from scale establishes benchmark calibrated simulating at larger, field scale.