A new anisotropic poroelasticity model to describe damage accumulation during cyclic triaxial loading of rock

SUMMARY Crustal rocks undergo repeated cycles of stress over time. In complex tectonic environments where stresses may evolve both spatially and temporally, such as volcanoes or active fault zones, these experience not only cyclic loading unloading, but also rotation and/or reorientation stresses. situations, any resulting crack distributions form sequentially therefore be highly anisotropic. Thus, the history crust recorded in deformed include evidence for paths, encompassing different magnitudes orientations. Despite this, ways which variations principal influence evolution anisotropic remain poorly constrained. this work, we build on previous non-linear damage rheology model by presenting a newly developed poroelastic rheological accounts coupled porosity evolution. The new shares main features previously scalar models, including ability to simulate entire yield curve through single formulation. model, condition is defined terms invariants strain tensor, so formulation operates with directional conditions (different values each direction) depending tensor triaxial conditions. This allows us discern evolving direction fit measured amounts accumulated from cycles. Coupling between compaction along damage-dependent produces reasonable experimentally obtained stress–strain curves. Furthermore, simulated time-dependent cumulative well correlated observed acoustic emissions during directions. As such, are able recreate many 3-D Kaiser ‘damage memory’ effect.