The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses
Darley Dale and Pennant sandstones were tested under conditions of both axisymmetric shortening and extension normal to bedding. These are the two extremes of loading under polyaxial stress conditions. Failure under generalized stress conditions can be predicted from the Mohr–Coulomb failure criteri...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-04-01
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| Series: | Solid Earth |
| Online Access: | http://www.solid-earth.net/7/493/2016/se-7-493-2016.pdf |
| _version_ | 1819044346791460864 |
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| author | A. Hackston E. Rutter |
| author_facet | A. Hackston E. Rutter |
| author_sort | A. Hackston |
| collection | DOAJ |
| description | Darley Dale and Pennant sandstones were tested under
conditions of both axisymmetric shortening and extension normal to bedding.
These are the two extremes of loading under polyaxial stress conditions.
Failure under generalized stress conditions can be predicted from the
Mohr–Coulomb failure criterion under axisymmetric shortening conditions,
provided the best form of polyaxial failure criterion is known. The sandstone
data are best reconciled using the Mogi (1967) empirical criterion. Fault
plane orientations produced vary greatly with respect to the maximum
compressive stress direction in the two loading configurations. The normals
to the Mohr–Coulomb failure envelopes do not predict the orientations of the
fault planes eventually produced. Frictional sliding on variously inclined
saw cuts and failure surfaces produced in intact rock samples was also
investigated. Friction coefficient is not affected by fault plane orientation
in a given loading configuration, but friction coefficients in extension were
systematically lower than in compression for both rock types. Friction data
for these and other porous sandstones accord well with the Byerlee (1978)
generalization about rock friction being largely independent of rock type.
For engineering and geodynamic modelling purposes, the stress-state-dependent
friction coefficient should be used for sandstones, but it is not known to
what extent this might apply to other rock types. |
| first_indexed | 2024-12-21T10:11:13Z |
| format | Article |
| id | doaj.art-26b14ad9e52f42e38d8e9c255e0d7052 |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-12-21T10:11:13Z |
| publishDate | 2016-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-26b14ad9e52f42e38d8e9c255e0d70522022-12-21T19:07:42ZengCopernicus PublicationsSolid Earth1869-95101869-95292016-04-017249350810.5194/se-7-493-2016The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stressesA. Hackston0E. Rutter1Rock Deformation Laboratory, School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UKRock Deformation Laboratory, School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UKDarley Dale and Pennant sandstones were tested under conditions of both axisymmetric shortening and extension normal to bedding. These are the two extremes of loading under polyaxial stress conditions. Failure under generalized stress conditions can be predicted from the Mohr–Coulomb failure criterion under axisymmetric shortening conditions, provided the best form of polyaxial failure criterion is known. The sandstone data are best reconciled using the Mogi (1967) empirical criterion. Fault plane orientations produced vary greatly with respect to the maximum compressive stress direction in the two loading configurations. The normals to the Mohr–Coulomb failure envelopes do not predict the orientations of the fault planes eventually produced. Frictional sliding on variously inclined saw cuts and failure surfaces produced in intact rock samples was also investigated. Friction coefficient is not affected by fault plane orientation in a given loading configuration, but friction coefficients in extension were systematically lower than in compression for both rock types. Friction data for these and other porous sandstones accord well with the Byerlee (1978) generalization about rock friction being largely independent of rock type. For engineering and geodynamic modelling purposes, the stress-state-dependent friction coefficient should be used for sandstones, but it is not known to what extent this might apply to other rock types.http://www.solid-earth.net/7/493/2016/se-7-493-2016.pdf |
| spellingShingle | A. Hackston E. Rutter The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses Solid Earth |
| title | The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses |
| title_full | The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses |
| title_fullStr | The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses |
| title_full_unstemmed | The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses |
| title_short | The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses |
| title_sort | mohr coulomb criterion for intact rock strength and friction a re evaluation and consideration of failure under polyaxial stresses |
| url | http://www.solid-earth.net/7/493/2016/se-7-493-2016.pdf |
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