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Transient Hydraulic Tests in Granite: Fissured Porous Medium Analysis and Results

Published online by Cambridge University Press:  15 February 2011

John H. Black  and
John A. Barker
John H. Black
Affiliation:
Institute of Geological Sciences, Harwell Laboratory, Oxfordshire, England
John A. Barker
Affiliation:
Institute of Geological Sciences, Harwell Laboratory, Oxfordshire, England
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Abstract

Slug and pulse tests have been used extensively to measure the hydraulic conductivity and specific storage of granitic rocks. After several hundred tests using an I.G.S. design of straddle packer test equipment, it became clear that the conventional methods of test analysis were inadequate. The straddle packer equipment developed by IGS allows the time scale of a test to be altered without repositioning the packers so that a range of tests can be carried out on the same test interval. The new analysis procedure presented here uses a model of fissured rock which incorporates water movement in both the fissures and the rock matrix. A new variable is introduced which includes the parameters matrix hydraulic conductivity, matrix specific storage fissure specific storage and fissure hydraulic conductivity together with the controllable variables, effective casing radius and packer interval length. Examples of analysis using multiple tests in the same interval are presented together with the apparent relationship between measured hydraulic conductivity and specific storage. It would appear that a small number of fissures endow the rock mass with the bulk of its hydraulic conductivity and that many of the higher hydraulic conductivity tests are probably associated with localised “pipe flow”.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 6: Symposium D – Scientific Basis for Nuclear Waste Management IV , 1981 , 223
Copyright
Copyright © Materials Research Society 1982

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References

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