The formation and properties of fault zones in brittle rock

John M Kemeny; Jane C.S. Long

The formation and properties of fault zones in brittle rock

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Seismic and radar tomography of the SCV underground test area in Stripa, Sweden have detected two major sets of fracture zones. Slickenside striations in these zones indicate that they have undergone shear deformation. Utilizing a database consisting of 3100 logged fractures from borehole core and 900 fractures mapped on the walls of underground drifts, the character of these fracture zones have been analyzed. This data along with numerical modelling suggest that the higher fluid conductivities in the zones compared with the surrounding rock may be due to a combination of higher fracture densities, and stresses in the zones that promote dilatancy in fractures with certain orientations. This would also result in anisotropic flow in the zones, with the primary flow direction in the direction of the dilatant fractures.

Original language	English (US)
Title of host publication	30th U.S. Symposium on Rock Mechanics, USRMS 1989
Editors	Khair
Publisher	American Rock Mechanics Association (ARMA)
Pages	115-122
Number of pages	8
ISBN (Print)	9061918715, 9789061918714
State	Published - Jan 1 1989
Externally published	Yes
Event	30th U.S. Symposium on Rock Mechanics, USRMS 1989 - Morgantown, United States Duration: Jun 19 1989 → Jun 22 1989

Other

Other	30th U.S. Symposium on Rock Mechanics, USRMS 1989
Country	United States
City	Morgantown
Period	6/19/89 → 6/22/89

ASJC Scopus subject areas

Geophysics
Geotechnical Engineering and Engineering Geology
Geology

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title = "The formation and properties of fault zones in brittle rock",

abstract = "Seismic and radar tomography of the SCV underground test area in Stripa, Sweden have detected two major sets of fracture zones. Slickenside striations in these zones indicate that they have undergone shear deformation. Utilizing a database consisting of 3100 logged fractures from borehole core and 900 fractures mapped on the walls of underground drifts, the character of these fracture zones have been analyzed. This data along with numerical modelling suggest that the higher fluid conductivities in the zones compared with the surrounding rock may be due to a combination of higher fracture densities, and stresses in the zones that promote dilatancy in fractures with certain orientations. This would also result in anisotropic flow in the zones, with the primary flow direction in the direction of the dilatant fractures.",

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AU - Long, Jane C.S.

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N2 - Seismic and radar tomography of the SCV underground test area in Stripa, Sweden have detected two major sets of fracture zones. Slickenside striations in these zones indicate that they have undergone shear deformation. Utilizing a database consisting of 3100 logged fractures from borehole core and 900 fractures mapped on the walls of underground drifts, the character of these fracture zones have been analyzed. This data along with numerical modelling suggest that the higher fluid conductivities in the zones compared with the surrounding rock may be due to a combination of higher fracture densities, and stresses in the zones that promote dilatancy in fractures with certain orientations. This would also result in anisotropic flow in the zones, with the primary flow direction in the direction of the dilatant fractures.

AB - Seismic and radar tomography of the SCV underground test area in Stripa, Sweden have detected two major sets of fracture zones. Slickenside striations in these zones indicate that they have undergone shear deformation. Utilizing a database consisting of 3100 logged fractures from borehole core and 900 fractures mapped on the walls of underground drifts, the character of these fracture zones have been analyzed. This data along with numerical modelling suggest that the higher fluid conductivities in the zones compared with the surrounding rock may be due to a combination of higher fracture densities, and stresses in the zones that promote dilatancy in fractures with certain orientations. This would also result in anisotropic flow in the zones, with the primary flow direction in the direction of the dilatant fractures.

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