Ring-shear experiments with strain markers

Experiment overview

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

Apparatus and material

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.

Data files and format

Sensor data during shear

These data files are named in the style "-stress-shear.tsv", where
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.

Strain marker data

These data files are named in the style "-shear-disp.tsv".  The values are tab-separated, with the following columns and units:

Marker position along shear direction [mm]

Marker depth [mm]

Author and funding

Anders Damsgaard , 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.