Effects of dilatant hardening on the development of concentrated shear deformation in fissured rock masses.

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Abstract

Specifically, this analysis considers the shear of an inelastically deforming rock mass containing a weakened layer of thickness h. The presence of the weakened layer causes localization instability, characterized by an unbounded ratio of a strain increment in the weakened layer to that in the far field, to occur earlier than it would be predicted from the response of the material surrounding the embedded layer. The development of instability in time depends on the ratio of the rate of imposed shear strain to that for fluid mass exchange between the layers. The time delay between final instability and the time at which the weakened layer passes the peak of its drained stress-strain curve is called the precursor time because rapid straining of the weakened layer occurs during this period. For a wide range of numerical values the precursor times are very short: less than a few hours for tectonic strain rates and less than a few tens of seconds for typical laboratory strain rates.-from Author

Original languageEnglish (US)
Pages (from-to)9259-9270
Number of pages12
JournalJournal of Geophysical Research
Volume89
Issue numberB11
DOIs
StatePublished - Jan 1 1984

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ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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