Abstract
To explore the nature of stress states at failure, published data are analyzed for three rock types - Dunnville sandstone, Red Wildmoor sandstone, and Taiwan siltstone - within the framework of three stress invariants. Data include a series of axisymmetric (conventional triaxial) compression, axisymmetric (conventional triaxial) extension, and multiaxial strength tests. The data are fitted to linear and nonlinear failure criteria: Paul-Mohr-Coulomb (PMC), a generalized linear criterion containing all three principal stresses; Hoek-Brown, a popular nonlinear criterion containing major and minor principal stresses; and a simplified version of PMC, where the friction angle in extension is assumed to be equal to the friction angle in compression. The results show that both versions of PMC provide a better approximation of the test data and successfully capture, in a piecewise-linear manner, the well-known nonlinear nature of the failure surface in the meridian and equipressure planes.
Original language | English (US) |
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Title of host publication | 56th U.S. Rock Mechanics/Geomechanics Symposium |
Publisher | American Rock Mechanics Association (ARMA) |
ISBN (Electronic) | 9780979497575 |
State | Published - 2022 |
Event | 56th U.S. Rock Mechanics/Geomechanics Symposium - Santa Fe, United States Duration: Jun 26 2022 → Jun 29 2022 |
Publication series
Name | 56th U.S. Rock Mechanics/Geomechanics Symposium |
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Conference
Conference | 56th U.S. Rock Mechanics/Geomechanics Symposium |
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Country/Territory | United States |
City | Santa Fe |
Period | 6/26/22 → 6/29/22 |
Bibliographical note
Funding Information:Partial support for Dr. Pouyan Asem was provided by the J.S. Braun/Braun Intertec Visiting Chair at the Department of Civil, Environmental, and Geo-Engineering, University of Minnesota.
Publisher Copyright:
© 2022 ARMA, American Rock Mechanics Association.