Influence of weakening minerals on ensemble strength and slip stability of faults: Influence of Weakening Minerals on Fault

Wang, Chaoyi; Elsworth, Derek; Fang, Yi

doi:10.1002/2016jb013687

Title: Influence of weakening minerals on ensemble strength and slip stability of faults: Influence of Weakening Minerals on Fault

Journal Article · Tue Aug 29 00:00:00 EDT 2017 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2016jb013687· OSTI ID:1532983

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Pennsylvania State Univ., University Park, PA (United States)

Abstract We explore the impact of phyllosilicate (weak but velocity strengthening) in a majority tectosilicate (strong but velocity weakening) matrix on bulk shear strength and slip stability of faults. Numerical simple shear experiments using a distinct element model (DEM) are conducted on both uniform mixtures of quartz and talc analogs and on textured mixtures consisting of a talc layer embedded in a quartz matrix. The mechanical response of particles is represented by a linear elastic contact model with a slip‐weakening constitutive relation representing the essence of rate‐state friction. The weight percentage of the talc in the uniform mixtures and the relative thickness of the talc layer in the textured mixtures are varied to investigate the transitional behavior of shear strength and slip stability. Specifically, for uniform mixtures, ~50% reduction on bulk shear strength is observed with 25% talc present, and a dominant influence of talc occurs at 50%; for textured mixtures, a noticeable weakening effect is shown at a relative layer thickness of 1 particle, ~50% shear strength reduction is observed with 3‐particles, and a dominant influence occurs at 5 particles. In terms of slip stability, a transition from velocity weakening to velocity strengthening is observed with 10% to 25% talc present in the uniform mixtures or with 3 particles to 5 particles in the textured mixtures. In addition, further analysis suggests that quartz has a high tendency toward dilation, potentially promoting permeability; while talc dilates with increased slip rate but compacts rapidly when slip rate is reduced, potentially destroying permeability. The simulation results match well with previous laboratory observations.

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Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE

Grant/Contract Number:: FE0023354; DE‐FE0023354

OSTI ID:: 1532983

Alternate ID(s):: OSTI ID: 1389882

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 122, Issue 9; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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