0508425 - ÚCHP 2020 DE eng C - Konferenční příspěvek (zahraniční konf.)
Pařez, Stanislav - Trávníčková, Tereza - Goren, L. - Aharonov, E.
Localization of Shear in Water-Saturated Granular Media.
Book of Abstracts. Vol. Session 6. Postdam: Helmholtz Centre Potsdam German Research Centre for Geosciences - GFZ, 2019 - (Hofmann, H.; Spalek, A.), s. 78
[EURO-Conference on Rock Physics and Geomechanics /13./. Potsdam (DE), 02.09.2019-06.09.2019]
Grant CEP: GA ČR(CZ) GJ19-21114Y
Institucionální podpora: RVO:67985858
Klíčová slova: granular media * pore fluid * fault
Obor OECD: Geology

Slip on geological faults is localized within narrow shear bands in the gauge zone. Often, the shear bands are located at the boundary between the gauge and the damage zone. Using a recently developed multi-scale model to couple grain + fluid evolution, we study the location of shear bands within a well-drained gauge. While in dry granular lay- ers there is no preferred position of shear bands, we show that water-saturated systems tend to localize shear on their boundary under some conditions. The conditions favoring boundary localization are high shear velocity, gauge thickness and low gauge permeability and confining stress. We propose a scaling argument to describe the pressure deviations in a shear band, and use that to predict the conditions for shear localizations on the boundary.
Trvalý link: http://hdl.handle.net/11104/0304175