Ring-shear experiments with strain markers

<strong>Experiment overview</strong> ID Shearing velocity [mm/min] Effective normal stress [kPa] mdt4 7.00 6 mdt5 0.70 6 mdt6 0.07 6 mdt7 7.00 50 mdt8 0.70 50 mdt9 0.07 50 <br> <strong>Apparatus and material</strong> These experiments were conducted in a ring-shear apparatus at the Department of Geoscience, Aarhus University, with a sample chamber volume of 14,48 l. The till was Mid-Danish Till deposited at the Last Glacial Maximum, and sampled at Knud Strand, Denmark. All shearing commenced under water-saturated conditions, and I used BB-gun pellets as strain markers. Please see the following publication for more technical details on the ring-shear apparaturs: Damsgaard, A., D. L. Egholm, J. A. Piotrowski, S. Tulaczyk, N. K. Larsen, and K. Tylmann (2013), Discrete element modeling of subglacial sediment deformation, J. Geophys. Res. Earth Surf., 118, 2230–2242, doi:10.1002/2013JF002830. <br> <strong>Data files and format</strong> <em>Sensor data during shear</em> These data files are named in the style "&lt;ID&gt;-stress-shear.tsv", where<br> ID refers to the experiment ID seen in the table above. The values are tab-separated, with the following columns and units: Shearing distance [mm] Normal stress [kPa] Shear stress [kPa] Dilation [mm] Important!: The shear stress readings are unreliable due to sensor failure. <em>Strain marker data</em> These data files are named in the style "&lt;ID&gt;-shear-disp.tsv". The values are tab-separated, with the following columns and units: Marker position along shear direction [mm] Marker depth [mm] <br> <strong>Author and funding</strong> Anders Damsgaard &lt;[e-mail]&gt;, Department of Geoscience, Aarhus University This dataset is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 897967.