Failure data from compression and extension testing of Dunnville sandstone and Webatuck dolomite were analyzed using three different criteria: Mohr-Coulomb, Hoek-Brown, and Paul-Mohr-Coulomb. An emphasis was placed on the details of the failure criteria under tensile-compressive loading conditions, which was possible due to a dog-bone specimen geometry. Tension cut-offs were implemented when using Mohr-Coulomb and Paul-Mohr-Coulomb due to unrealistic predictions of (theoretical) tensile strength. It was determined that under tensile-compressive loading conditions, a tension cut-off provided a better match than Hoek-Brown to the data for the two rock types examined. Hoek-Brown overestimates the uniaxial tensile strength by a factor between 2-3 and has the greatest overall least absolute residual error in the low mean stress region.
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Failure of Rock Under Tensile-Compressive Loading
Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, San Francisco, California, USA, June 2017.
Paper Number: ARMA-2017-0929
Published: June 25 2017
Sharpe, J. D., and J. F. Labuz. "Failure of Rock Under Tensile-Compressive Loading." Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, San Francisco, California, USA, June 2017.
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