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Measuring the hydraulic transmissivity of a rock joint under varying normal load
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0003-4526-4061
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0002-9586-8667
2023 (English)In: IOP Conference Series: Earth and Environmental Science, Institute of Physics , 2023, no 1Conference paper, Published paper (Refereed)
Abstract [en]

The water flow rate through a rectangular granite specimen with a tight unopened natural induced joint of dimensions 200×200 mm was measured in two perpendicular directions. The measurements were conducted at five different levels of stress corresponding to loading from 0 to 8 MPa and unloading back to 0 MPa. The flow was measured at different hydraulic gradients in the range of 10 to 25. The results showed a joint transmissivity between 0.002-0.03 mm2/s and a hydraulic aperture of 8-32 μm. It was shown that the measurements performed in the second orientation displayed smaller transmissivity and hydraulic aperture as compared to those in the first orientation, showing a residual compaction after the first load cycle. The Reynolds number was less than one in all the measurements yielding laminar flow conditions. Deviations from the linear regime relationship were observed for the lowest flow rates (Re < 0.1). A transitory regime was observed when varying the hydraulic gradient. This regime was observed to be longer at the lowest flow rates. © 2023 Institute of Physics Publishing. All rights reserved.

Place, publisher, year, edition, pages
Institute of Physics , 2023. no 1
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-65344DOI: 10.1088/1755-1315/1124/1/012050Scopus ID: 2-s2.0-85146617420OAI: oai:DiVA.org:ri-65344DiVA, id: diva2:1768421
Conference
Eurock 2022 Symposium: Rock and Fracture Mechanics in Rock Engineering and Mining, 11 September 2022 through 15 September 2022
Note

Funding details: TASK10; Funding text 1: The experimental work was funded by Swedish Nuclear Waste and Management Co, Sweden (SKB) and is a part of the international project, TASK10, on Groundwater Flow and Transport of Solutes (GWFTS) which involves several nuclear waste management companies.

Available from: 2023-06-15 Created: 2023-06-15 Last updated: 2023-06-15Bibliographically approved

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Jacobsson, LarsGodio, Michele

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