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

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% talcmore » 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1532983
Alternate Identifier(s):
OSTI ID: 1389882
Grant/Contract Number:  
[FE0023354]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
[ Journal Volume: 122; Journal Issue: 9]; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geochemistry & Geophysics

Citation Formats

Wang, Chaoyi, Elsworth, Derek, and Fang, Yi. Influence of weakening minerals on ensemble strength and slip stability of faults: Influence of Weakening Minerals on Fault. United States: N. p., 2017. Web. doi:10.1002/2016jb013687.
Wang, Chaoyi, Elsworth, Derek, & Fang, Yi. Influence of weakening minerals on ensemble strength and slip stability of faults: Influence of Weakening Minerals on Fault. United States. doi:10.1002/2016jb013687.
Wang, Chaoyi, Elsworth, Derek, and Fang, Yi. Tue . "Influence of weakening minerals on ensemble strength and slip stability of faults: Influence of Weakening Minerals on Fault". United States. doi:10.1002/2016jb013687. https://www.osti.gov/servlets/purl/1532983.
@article{osti_1532983,
title = {Influence of weakening minerals on ensemble strength and slip stability of faults: Influence of Weakening Minerals on Fault},
author = {Wang, Chaoyi and Elsworth, Derek and Fang, Yi},
abstractNote = {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.},
doi = {10.1002/2016jb013687},
journal = {Journal of Geophysical Research. Solid Earth},
number = [9],
volume = [122],
place = {United States},
year = {2017},
month = {8}
}

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