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A Reconsideration of the Extension Strain Criterion for Fracture and Failure of Rock

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Abstract

The complex behaviours of rocks and rock masses have presented paradoxes to the rock engineer, including the fracturing of seemingly strong rock under low stress conditions, which often occurs near excavation boundaries. The extension strain criterion was presented as a fracture initiation criterion under these conditions (Stacey in Int J Rock Mech Min Sci 18:469–474, 1981). This criterion has been used successfully by some and criticised by others. In this paper, we review the literature on the extension strain criterion and present a case for the correct interpretation of the criterion and the conditions suitable for its use. We argue that the extension strain criterion can also be used to provide an indication of damage level under conditions of relatively low confining stress. We also present an augmentation of the criterion, the ultimate extension strain, which is applicable under extensional loading conditions when σ 2 is similar in magnitude to σ 1.

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Authors and Affiliations

  1. Australian Centre for Geomechanics, The University of Western Australia, Perth, Australia

    J. Wesseloo

  2. University of the Witwatersrand, Johannesburg, South Africa

    T. R. Stacey

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  1. J. Wesseloo
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  2. T. R. Stacey
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Correspondence to J. Wesseloo.

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Wesseloo, J., Stacey, T.R. A Reconsideration of the Extension Strain Criterion for Fracture and Failure of Rock. Rock Mech Rock Eng 49, 4667–4679 (2016). https://doi.org/10.1007/s00603-016-1059-0

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