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Rock Mechanics and Rock Engineering

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14.02.2018 | Original Paper

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

verfasst von: G. Walton, L. R. Alejano, J. Arzua, T. Markley

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 6/2018

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Abstract

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.

Nächster Artikel Effects of Thermal Damage on Strain Burst Mechanism for Brittle Rocks Under True-Triaxial Loading Conditions

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Titel: Crack Damage Parameters and Dilatancy of Artificially Jointed Granite Samples Under Triaxial Compression
verfasst von: G. Walton
L. R. Alejano
J. Arzua
T. Markley
Publikationsdatum: 14.02.2018
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 6/2018
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-018-1433-1

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