Permeability change near instrumentation holes in jointed rock: implications for the tuff radionuclide-migration field experiment | Zendy

R.P. Rechard | Zendy; Kevin Schuler | Zendy

Open Access

Permeability change near instrumentation holes in jointed rock: implications for the tuff radionuclide-migration field experiment

Author(s) -

R.P. Rechard,

Kevin Schuler

Publication year - 1982

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/59468

Subject(s) - joint (building) , permeability (electromagnetism) , geology , drill , geotechnical engineering , aperture (computer memory) , instrumentation (computer programming) , materials science , structural engineering , engineering , chemistry , computer science , metallurgy , operating system , biochemistry , membrane

In order to assess in situ joint permeability near waste repositories, it has been proposed that instrumentation holes with axes parallel to the joint plane be drilled. However, the drill holes after the normal stress across the joint. The resultant stress concentration decreases the joint aperture and can significantly affect the joint permeability. Different intersections of the hold axis relative to the joint plane were examined utilizing a plane-strain, elastic analysis. It was found that a tangential joint intersection minimized the normal stress change. Stress along the joint increased by 10 to 15 percent and the permeability-aperture product decreased to 65 to 70 percent of its original flow

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