Simulating stick‐slip failure in a sheared granular layer using a physics‐based constitutive model
| Autor: | Chris Marone, Charles K. C. Lieou, Paul A. Johnson, Eric G. Daub, Robert E. Ecke, Robert A. Guyer |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Constitutive equation Shear load Stiffness Granular layer Mechanics Slip (materials science) Physics based 01 natural sciences Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter Geophysics Rheology Shear (geology) Space and Planetary Science Geochemistry and Petrology 0103 physical sciences Earth and Planetary Sciences (miscellaneous) medicine Geotechnical engineering medicine.symptom 010306 general physics 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geophysical Research: Solid Earth. 122:295-307 |
| ISSN: | 2169-9356 2169-9313 |
| DOI: | 10.1002/2016jb013627 |
| Popis: | 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 STZ's, 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. |
| Databáze: | OpenAIRE |
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