EPJ Web Conf.
Volume 249, 2021Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
|Number of page(s)||4|
|Published online||07 June 2021|
Shear bands in dense fault gouge
Univ Lyon, INSA-Lyon, CNRS UMR5259, LaMCoS, 69621, France.
2 Univ. Lyon, INSA-Lyon, GEOMAS, EA7495, 69621, France.
* Corresponding author: email@example.com
Published online: 7 June 2021
Earthquakes happen with frictional sliding, by releasing all the stresses accumulated in the prestressed surrounding medium. The geological fault gouge, coming from the wear of previous slips, acts on friction stability and plays a key role in this sudden energy release. A large part of slip mechanisms are influenced, if not controlled, by the characteristics and environment of this tribological “third body”. A 2D granular fault (mm scale) is implemented with Discrete Element Modelling (DEM). A displacement-driven model with dry contact is studied to observe kinematics and properties of the slipping zone. Increasing the length of the granular media increases the slip needed to weaken the friction from friction peak to steadystate. Low-angle Riedel shear bands are mostly observed. Their number increases with the inter-particle friction coefficient, which also influences shear bands formation in their orientation angle (higher friction leads to higher angle with the main slip direction).
A video is available at https://doi.org/10.48448/nm1s-hw69
© The Authors, published by EDP Sciences, 2021
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