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A conceptual model for the peak shear strength of fresh and unweathered rock joints
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0002-8152-6092
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
2014 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 69, 31-38 p.Article in journal (Refereed) Published
Abstract [en]

Several criteria have been proposed over the years in order to predict the peak shear strength of rock joints.The most widely used criterion is the JRC-JCS criterion by Barton. It says that changes in the peak shear strength originate from surface roughness, joint wall compressive strength and normal stress. A limitation with this criterion is that the contribution from roughness could be overestimated for natural and mismatched joints if the joint roughness coefficient, JRC, is estimated based on the direct profiling method. To account for this effect, Zhao introduced the joint matching coefficient, JMC, which accounts for the matedness of the joint. In addition to this, it is known that the scale of the sheared joint could affect the peak shear strength. However, no criterion exists that describes how roughness, matedness and scale interact. In this paper, a conceptual model is proposed. The model is based on adhesion and fractal theory, measurements of surface roughness and the anticipated variation of the number and size of the contact points. The model proposes how the compressive strength and the roughness of the joint surface together with the matedness of the joint interact in order to form the shear strength of the joint under constant normal load conditions. The model also suggests an explanation for the scale effect of rock joints with respect to the surface roughness.

Place, publisher, year, edition, pages
2014. Vol. 69, 31-38 p.
Keyword [en]
Rock joints, Peak shear strength, Roughness, Matedness, Scale
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-144324DOI: 10.1016/j.ijrmms.2014.03.005ISI: 000335918200004Scopus ID: 2-s2.0-84898881142OAI: oai:DiVA.org:kth-144324DiVA: diva2:713054
Note

QC 20140612

Available from: 2014-04-17 Created: 2014-04-17 Last updated: 2017-12-05Bibliographically approved

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Johansson, Fredrik

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