Anisotropic features of geometry and permeability in fractured rock masses
Anisotropic features of geometry and permeability in fractured rock masses
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.
65-75
Zhang, Xing
e92abcc2-6163-40b0-9b53-0a61bdf864d7
Sanderson, David J.
5653bc11-b905-4985-8c16-c655b2170ba9
November 1995
Zhang, Xing
e92abcc2-6163-40b0-9b53-0a61bdf864d7
Sanderson, David J.
5653bc11-b905-4985-8c16-c655b2170ba9
Zhang, Xing and Sanderson, David J.
(1995)
Anisotropic features of geometry and permeability in fractured rock masses.
Engineering Geology, 40 (1-2), .
(doi:10.1016/0013-7952(95)00040-2).
Abstract
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
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Local EPrints ID: 76138
URI: http://eprints.soton.ac.uk/id/eprint/76138
ISSN: 0013-7952
PURE UUID: db3af1c5-9670-4ab9-af29-4d0a6d9baca6
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:53
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Author:
Xing Zhang
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