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Impact of scale on rock strength
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6851-4839
Division of Production and Mechanical Engineering, University of Lund.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
2016 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660Article in journal (Refereed) Accepted
Abstract [en]

The scale dependence of the strength of virtually homogeneous rock is caused by the spectrum of discontinuities of different size and nature. This makes small samples significantly stronger and less deformable than larger ones. The strength reduction for larger volumes is defined and found to apply to rock volumes 500 times larger than standard samples tested in the laboratory. Recording of the creep strain in large-scale load tests show the strain rate to be strongly retarded and negligible for stresses lower than about 1/3 of the failure load. For higher stresses creep took place according to a log time law representing secondary creep that ultimately changed to tertiary creep and failure.

Place, publisher, year, edition, pages
2016.
Keywords [en]
creep, rock, strength, stress, Civil engineering and architecture - Geoengineering and mining engineering
Keywords [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-15269Local ID: ec59e25d-c2a7-40fa-92d6-88fa1bb0bde0OAI: oai:DiVA.org:ltu-15269DiVA, id: diva2:988243
Note

Upprättat; 2014; 20120530 (svek)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-06-26

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