10.5880/GFZ.4.1.2022.002 eng dataset GFZ German Research Centre for Geosciences datapub@gfz-potsdam.de http://www.gfz-potsdam.de Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences pointOfContact 2022-12-19 urn:ogc:def:crs:EPSG:4326 Ring-shear test data of glass beads 200-300 µm used for analogue experiments in the tectonic modelling labs at GFZ Potsdam and the Institute of Geophysics of the Czech Academy of Science, Prague 2022-12-19 revision doi:10.5880/GFZ.4.1.2022.002 Rosenau, Matthias GFZ German Research Centre for Geosciences, Potsdam, Germany author Kemnitz, Helga GFZ German Research Centre for Geosciences, Potsdam, Germany author Pohlenz, Andre GFZ German Research Centre for Geosciences, Potsdam, Germany author Warsitzka, Michael Institute of Geophysics, Czech Academy of Sciences, Prague, Czech Republic author Zavada, Prokop Institute of Geophysics, Czech Academy of Sciences, Prague, Czech Republic author Rosenau, Matthias GFZ German Research Centre for Geosciences, Potsdam, Germany originator HelTec - Helmholtz Laboratory for Tectonic Modelling (GFZ German Research Centre for Geosciences, Germany) GFZ German Research Centre for Geosciences, Potsdam, Germany originator GFZ Data Services publisher This dataset provides friction data from ring-shear tests on glass beads with a diameter of 200-300 µm used in analogue modelling of tectonic processes as a rock analogue for “weak” layers in the earth’s upper crust (e.g. Klinkmüller et al., 2016; Ritter et al., 2016; Lohrmann et al., 2003) or as “seismogenic” crust (Rudolf et al., 2022). The glass beads are characterized by means of internal friction coefficients µ and cohesion C. According to our analysis the materials show a Mohr-Coulomb behaviour characterized by a linear failure envelope. Peak, dynamic and reactivation friction coefficients of the glass beads are µP = 0.51 , µD = 0.40, and µR = 0.44, respectively (Table 5). Cohesion of the material ranges between 40 Pa and 70 Pa. The material shows a minor rate-weakening of ~1% per ten-fold change in shear velocity v and a stick-slip behaviour at low shear velocities and at high loads. Rosenau GFZ German Research Centre for Geosciences, Potsdam, Germany Matthias rosen@potsdam.de http://https://www.gfz-potsdam.de/staff/matthias.rosenau informtion pointOfContact EPOS TCS MSL analogue models of geologic processes multi-scale laboratories property data of analogue modelling materials analogue modelling results software tools Cohesion Friction coefficient EPOS WP16 Analogue Measured Property publication deformation > shearing EPOS WP16 Analogue Process/Hazard publication fault EPOS WP16 Analogue Geologic Structure publication Microspheres > Glassy EPOS WP16 Analogue Material publication Ring-shear tester EPOS WP16 Analogue Apparatus publication CC BY 4.0 CC BY 4.0 10.1016/j.tecto.2016.01.017 DOI Cites 10.1016/S0191-8141(03)00005-1 DOI Cites 10.1002/2016JB012915 DOI Cites 10.1029/2021GC009825 DOI Cites https://gitext.gfz-potsdam.de/analab-code/rst-evaluation/ URL Cites 10.1002/ceat.200303112 DOI Cites eng geoscientificInformation http://doi.org/10.5880/GFZ.4.1.2022.002 WWW:LINK-1.0-http--link Data Access - DOI Data Access - DOI information The data presented here are derived by ring shear testing using a SCHULZE RST-01.pc (Schulze, 1994, 2003, 2008) at the Helmholtz Laboratory for Tectonic Modelling (HelTec) of the GFZ German Research Centre for Geosciences in Potsdam. The RST is specially designed to measure friction coefficients µ and cohesions C in loose granular material accurately at low confining pressures (<20 kPa) and shear velocities (<1 mm/sec) similar to sandbox experiments. In this tester, a granular bulk material layer is sheared internally at constant normal stress σN and shear velocity v while shear force and lid displacement (corresponding to density and volume change ΔV) are measured continuously. For more details see Klinkmüller et al. (2016) and Ritter et al. (2016).