Joint surface matching and shear strength. Part B: JRC-JMC shear strength criterion

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The JRC-JCS model tends to overpredict the shear strength for those natural joints with less matched surfaces. To overcome this shortcoming, a new JRC-JMC shear strength criterion is proposed in order to include the effects of both joint surface roughness and joint matching, in the form of τ = σn.tan[JRC.JMC.log10 (JCS/σn) + φr]. The JMC should be set at 0.3 for any measured JMC <0.3. It is a modification of the existing JRC-JCS criterion. The new JRC-JMC model provides appropriate fitting of the shear test results on various joints with different degrees of surface, roughness and matching, and gives a better interpretation and prediction, particularly for natural joints that do not have perfectly matched surfaces.

Original languageEnglish
Pages (from-to)179-185
Number of pages7
JournalInternational Journal of Rock Mechanics and Mining Sciences
Issue number2
Publication statusPublished - 1 Feb 1997

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