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A novel method for geometric quality assurance of rock joint replicas in direct shear testing : Part 2: Validation and mechanical replicability
KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-4551-5644
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden; SKB Swedish Nuclear Fuel and Waste Management Co, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0001-7182-0872
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2023 (English)In: Journal of Rock Mechanics and Geotechnical Engineering, ISSN 1674-7755Article in journal (Refereed) Epub ahead of print
Abstract [en]

Each rock joint is unique by nature which means that utilization of replicas in direct shear tests is required in experimental parameter studies. However, a method to acquire knowledge about the ability of the replicas to imitate the shear mechanical behavior of the rock joint and their dispersion in direct shear testing is lacking. In this study, a novel method is presented for geometric quality assurance of replicas. The aim is to facilitate generation of high-quality direct shear testing data as a prerequisite for reliable subsequent analyses of the results. In Part 1 of this study, two quality assurance parameters, σmf and VHp100, are derived and their usefulness for evaluation of geometric deviations, i.e. geometric reproducibility, is shown. In Part 2, the parameters are validated by showing a correlation between the parameters and the shear mechanical behavior, which qualifies the parameters for usage in the quality assurance method. Unique results from direct shear tests presenting comparisons between replicas and the rock joint show that replicas fulfilling proposed threshold values of σmf < 0.06 mm and < 0.2 mm have a narrow dispersion and imitate the shear mechanical behavior of the rock joint in all aspects apart from having a slightly lower peak shear strength. The wear in these replicas, which have similar morphology as the rock joint, is in the same areas as in the rock joint. The wear is slightly larger in the rock joint and therefore the discrepancy in peak shear strength derives from differences in material properties, possibly from differences in toughness. It is shown by application of the suggested method that the quality assured replicas manufactured following the process employed in this study phenomenologically capture the shear strength characteristics, which makes them useful in parameter studies.

Place, publisher, year, edition, pages
2023.
Keywords [en]
Three-dimensional (3D) scanning, Contact area measurements, Direct shear testing, Geometric quality assurance, Mechanical replicability, Replicas, Rock joint
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:ri:diva-64280DOI: 10.1016/j.jrmge.2022.12.012OAI: oai:DiVA.org:ri-64280DiVA, id: diva2:1747706
Note

The authors would like to acknowledge the financial contribution received from BeFo Rock Engineering Research Foundation (Grant proposal BeFo 391); Nuclear Waste Management Organization (NWMO), Toronto, Canada and Swedish Nuclear Fuel and Waste Management Co. (SKB), Solna, Sweden. 

Available from: 2023-03-30 Created: 2023-03-30 Last updated: 2023-07-03Bibliographically approved

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Larsson, JörgenJohnson, ErlandFlansbjer, MathiasWilliams Portal, Natalie

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