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Anisotropic features of geometry and permeability in fractured rock masses

Zhang, Xing and Sanderson, David J. (1995) Anisotropic features of geometry and permeability in fractured rock masses Engineering Geology, 40, (1-2), pp. 65-75. (doi:10.1016/0013-7952(95)00040-2).

Record type: Article


A geometric anisotropy factor (A f) of two-dimensional, natural fracture systems has been defined according to fracture spacing and orientation in a given direction. Geometric anisotropy of fracture systems has a major effect on the percolation threshold (the critical fracture density) of fracture systems below which the overall permeability is zero.

A two-dimensional distinct element code (UDEC) has been used to calculate directional flow-rates of fracture systems. Simulated and natural fracture patterns, sampled on outcrops in the Lake District (England), have been tested to examine the relation between geometric anisotropy and permeability anisotropy, which is demonstrated to have a power-law form. Also, the differential anisotropy factor (A f) results in different universal exponents which govern the relation between fracture density and flow rates.

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Published date: November 1995


Local EPrints ID: 76138
ISSN: 0013-7952
PURE UUID: db3af1c5-9670-4ab9-af29-4d0a6d9baca6
ORCID for David J. Sanderson: ORCID iD

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:41

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