Simulating stick-slip failure in a sheared granular layer using a physics-based constitutive model

Charles K.C. Lieou, Eric G. Daub, Robert A. Guyer, Robert E. Ecke, Chris Marone, Paul A. Johnson

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We model laboratory earthquakes in a biaxial shear apparatus using the Shear-Transformation-Zone (STZ) theory of dense granular flow. The theory is based on the observation that slip events in a granular layer are attributed to grain rearrangement at soft spots called STZs, which can be characterized according to principles of statistical physics. We model lab data on granular shear using STZ theory and document direct connections between the STZ approach and rate-and-state friction. We discuss the stability transition from stable shear to stick-slip failure and show that stick slip is predicted by STZ when the applied shear load exceeds a threshold value that is modulated by elastic stiffness and frictional rheology. We also show that STZ theory mimics fault zone dilation during the stick phase, consistent with lab observations.

Original languageEnglish (US)
Pages (from-to)295-307
Number of pages13
JournalJournal of Geophysical Research: Solid Earth
Volume122
Issue number1
DOIs
StatePublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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