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Rock fracture spacings, openings and porosities

Snow, D.T.

Method for determining fracture porosity resulting from presence of openings produced by breaking or shattering of otherwise less pervious rock from permeability measurements in drill holes; it applies only to rocks in which intergranular permeability is very small compared to fracture permeability measured by field tests of large rock masses; studies of water pressure-test results from 35 dam sites indicate that maximum fracture porosities are about 0.05% near surface, decreasing to about 0.005% at 200-ft depth; fracture openings decrease to about 100 to 50 μ in same depth interval; minimum spacing of open fractures increases from 4 to 14 ft. (See also ASCE Structural Eng Conference -- Preprint 515 v 94 n SM1 May 8-12 1967 42 p)

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Rock fracture spacings, openings and porosities

Snow, D.T.

Method for determining fracture porosity resulting from presence of openings produced by breaking or shattering of otherwise less pervious rock from permeability measurements in drill holes; it applies only to rocks in which intergranular permeability is very small compared to fracture permeability measured by field tests of large rock masses; studies of water pressure-test results from 35 dam sites indicate that maximum fracture porosities are about 0.05% near surface, decreasing to about 0.005% at 200-ft depth; fracture openings decrease to about 100 to 50 μ in same depth interval; minimum spacing of open fractures increases from 4 to 14 ft. (See also ASCE Structural Eng Conference -- Preprint 515 v 94 n SM1 May 8-12 1967 42 p)

Rock fracture spacings, openings and porosities

Snow, D.T.

Method for determining fracture porosity resulting from presence of openings produced by breaking or shattering of otherwise less pervious rock from permeability measurements in drill holes; it applies only to rocks in which intergranular permeability is very small compared to fracture permeability measured by field tests of large rock masses; studies of water pressure-test results from 35 dam sites indicate that maximum fracture porosities are about 0.05% near surface, decreasing to about 0.005% at 200-ft depth; fracture openings decrease to about 100 to 50 μ in same depth interval; minimum spacing of open fractures increases from 4 to 14 ft. (See also ASCE Structural Eng Conference -- Preprint 515 v 94 n SM1 May 8-12 1967 42 p)

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Title:

Rock fracture spacings, openings and porosities

Additional title:

ASCE -- Proc (J Soil Mechanics Foundations Div)

Contributors:

Snow, D.T. (author)

Published in:

American Society of Civil Engineers Proceedings, Journal of the Soil Mechanics and Foundations Division

Publication date:

1968

Size:

19 pages

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

© Metadata Copyright Elsevier B. V. All rights reserved.

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