Rock Mechanics and Rock Engineering

, Volume 51, Issue 6, pp 1637–1656 | Cite as

Crack Damage Parameters and Dilatancy of Artificially Jointed Granite Samples Under Triaxial Compression

Original Paper


A database of post-peak triaxial test results was created for artificially jointed planes introduced in cylindrical compression samples of a Blanco Mera granite. Aside from examining the artificial jointing effect on major rock and rock mass parameters such as stiffness, peak strength and residual strength, other strength parameters related to brittle cracking and post-yield dilatancy were analyzed. Crack initiation and crack damage values for both the intact and artificially jointed samples were determined, and these damage envelopes were found to be notably impacted by the presence of jointing. The data suggest that with increased density of jointing, the samples transition from a combined matrix damage and joint slip yielding mechanism to yield dominated by joint slip. Additionally, post-yield dilation data were analyzed in the context of a mobilized dilation angle model, and the peak dilation angle was found to decrease significantly when there were joints in the samples. These dilatancy results are consistent with hypotheses in the literature on rock mass dilatancy.


Triaxial testing Artificially jointed samples Dilation Progressive damage Rock mass behavior 



The authors thank the Spanish Ministry of Economy and Competitiveness for partial financial support of this study, awarded under Contract Reference No. BIA2014-53368P. This contract is partially financed by means of ERDF funds of the EU.


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • G. Walton
    • 1
  • L. R. Alejano
    • 2
  • J. Arzua
    • 2
  • T. Markley
    • 1
  1. 1.Colorado School of MinesGoldenUSA
  2. 2.Universidad de VigoVigoSpain

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