Reexamination of fault angles predicted by shear localization theory

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This paper reexamines orientations of shear bands (fault angles) predicted by a theory of shear localization as a bifurcation from homogeneous deformation. In contrast to the Coulomb prediction, which does not depend on deviatoric stress state, the angle between the band normal and the least (most compressive) principal stress increases as the deviatoric stress state varies from axisymmetric compression to axisymmetric extension. This variation is consistent with the data of Mogi (1967) on Dunham dolomite for axisymmetric compression, extension and biaxial compression, but the predicted angles are generally less than observed. This discrepancy may be due to anisotropy that develops ... continued below

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12 p.

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Rudnicki, J.W. & Olsson, W.A. February 1, 1998.

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  • Rudnicki, J.W. Northwestern Univ., Evanston, IL (United States). Dept. of Civil Engineering
  • Olsson, W.A. Sandia National Labs., Albuquerque, NM (United States). Geomechanics Dept.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

This paper reexamines orientations of shear bands (fault angles) predicted by a theory of shear localization as a bifurcation from homogeneous deformation. In contrast to the Coulomb prediction, which does not depend on deviatoric stress state, the angle between the band normal and the least (most compressive) principal stress increases as the deviatoric stress state varies from axisymmetric compression to axisymmetric extension. This variation is consistent with the data of Mogi (1967) on Dunham dolomite for axisymmetric compression, extension and biaxial compression, but the predicted angles are generally less than observed. This discrepancy may be due to anisotropy that develops due to crack growth in preferred orientations. Results from specialized constitutive relations for axisymmetric compression and plane strain that include this anisotropy indicate that it tends to increase the predicted angles. Measurements for a weak, porous sandstone (Castlegate) indicate that the band angle decreases with increasing inelastic compaction that accompanies increasing mean stress. This trend is consistent with the predictions of the theory but, for this rock, the observed angles are less than predicted.

Physical Description

12 p.

Notes

OSTI as DE98004223

Source

  • 3. North American Rock Mechanics Society conference, Cancun (Mexico), 3-5 Jun 1998

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  • Other: DE98004223
  • Report No.: SAND--98-0519C
  • Report No.: CONF-980620--
  • Grant Number: AC04-94AL85000;FG02-93ER14344
  • Office of Scientific & Technical Information Report Number: 650166
  • Archival Resource Key: ark:/67531/metadc706474

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  • February 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 14, 2016, 9:16 p.m.

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Rudnicki, J.W. & Olsson, W.A. Reexamination of fault angles predicted by shear localization theory, article, February 1, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc706474/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.