ora zone of more jointed rock. The measured rock permeabilities decrease steadily with an increase in depth, however, and their values correspond well with the theoretical trend of rock mass permeability estimated with the model. Typical hydraulic apertures of400 –500 μm and joint stiffness following a hyperbolic relationship with K =10V mc and mcV = hoa seem to agree well with observed field behavior for these crystalline rock masses. Fig.2.Theoretical jointed rock mass permeability relationship with depth. Although real Hydromechanical behavior of jointed rock masses is site specific and depends on geologic factors, which need tobe taken into account, the proposed approach provides a framework to estimate rock mass permeability during design stages where information isnot yet available.
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