Fluid flow within rocks is a key issue in several geo-engineering areas, such as water dam constructions, underwater constructions, petroleum engineering, nuclear waste disposal, geothermal energy production etc. The permeability evolution of brittle rocks is a dynamic process which is closely related to the micro-structural damage. With increasing load level and deformation, initial defects will grow and new ones will be initiated, later they will be connected to each other and consequently permeability will increase.
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