A Block-Scale Stress-Permeability Relationship of a Fractured Rock Determined by Numerical Experiments

摘要: We present the stress induced permeability change in a fractured rock with special focuses on 1) fracture closure/opening process, 2) anisotropic conditions, and 3) dilation. In order to overcome limitations from experimental study single or analytical orthogonal and/or persistent models, realistic Discrete Fracture Network (DFN) models were used as geometrical basis. A series of numerical experiments fluid flow are conducted under different boundary conditions for calculation equivalent permeability. From analysis DFN model, this paper demonstrates decrease normal closure, increased anisotropy increase significant channelling effect due It is shown that block-scale depends not only magnitude but also orientation differential stresses.