Computational multiphase periporomechanics for unguided cracking in unsaturated porous media

In this article, we formulate and implement a computational multiphase periporomechanics paradigm for unguided fracturing in unsaturated porous media assuming passive pore air pressure. The same governing equation the solid phase applies on off cracks. Crack formation framework is autonomous, requiring no prior estimates of crack topology. As new contribution, an energy-based criterion arbitrary formulated using peridynamic effective force state media. Unsaturated fluid flow fracture space modeled simplified way line with nonlocal formulation bulk. numerically implemented through implicit fractional step algorithm time two-phase mixed meshless method space. two-stage operator split converts coupled problem into undrained deformation deformed skeleton configuration. Numerical simulations in-plane open shear cracking are conducted to validate accuracy robustness model. Then numerical examples wing nonplanar soil specimens presented demonstrate efficacy proposed