The phenomenon exhibited by some fluids, sols, and gels in which they become more viscous or solid under pressure.
- Grain-scale brittle dilatancy would increase permeability, readily promoting the influx of CO2-rich hydrous fluids into the fault zone soon after its initiation.
- Association with vertical joints suggests that the deformation is progressively evolving towards dilatancy with increasing tectonically induced differential stress.
- It also distinguishes between two types of hardening, namely shear hardening and compression hardening and incorporates soil dilatancy and a yield cap.
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