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Micromechanics of shear failure in a porous rock: a combined dataset of high-resolution time-resolved 3D x-ray micro-tomography volumes and local 3D strain fields with contemporaneous acoustic emissions and ultrasonic velocity survey waveforms

Dataset title Micromechanics of shear failure in a porous rock: a combined dataset of high-resolution time-resolved 3D x-ray micro-tomography volumes and local 3D strain fields with contemporaneous acoustic emissions and ultrasonic velocity survey waveforms
Dataset creators Alexis Cartwright-Taylor, University of Edinburgh
Ian B. Butler, University of Edinburgh
Florian Fusseis, University of Edinburgh
Martin Ling, Edinburgh Hacklab
Edward Andò, École Polytechnique Fédérale de Lausanne
Maria-Daphne Mangriotis, University of Edinburgh
Ian G. Main, University of Edinburgh (PI)
Roberto E. Rizzo, University of Edinburgh
Sina Marti, University of Edinburgh
Derek D. Leung, University of Edinburgh
Oxana V. Magdysyuk, Diamond Light Source
Dataset theme Geoscientific Information
Dataset abstract

This dataset shows both the micro-scale mechanisms and acoustic response involved in shear failure of a deforming porous rock. To our knowledge, this is the first such dataset to combine simultaneous acoustic measurements and x-ray tomography imaging.

It comprises a time-series of 3D in-situ synchrotron x-ray microtomography (μCT) volumes showing a Clashach sandstone sample (CL10) undergoing triaxial deformation to failure under a constant acoustic emissions (AE) event rate. Use of a constant AE event rate slowed down the failure process after peak stress, enabling shear failure to be captured in unprecedented spatio-temporal detail by the μCT volumes. These volumes are accompanied by the local incremental 3D strain fields and simultaneously acquired waveforms from acoustic emissions and ultrasonic velocity surveys, as well as mechanical bulk stress and strain. These data are fully explained in Cartwright-Taylor et al. Seismic events miss important grain-scale mechanisms governed by kinematics during shear failure of porous rock, in review at Nature Communications. We also include an equivalent time-series of the same data types showing a second Clashach sandstone sample (CL04) undergoing triaxial deformation to failure, this time under a constant strain rate where failure happened abruptly, shortly after peak stress. Both collections were acquired in-situ on the beamline I12-JEEP at the Diamond Light Source, Didcot, UK, in September 2019.

Each 3D μCT volume of the sample is contained in a .zip file labelled with the sequential scan number. Each volume comprises reconstructed 16-bit grey-scale data in a sequence of 2D image files (.tif), each numbered according to the depth at which it lies within the sample volume. The file dimensions are pixels, with an edge length of 7.91 μm. Two further .zip files contain the incremental 3D volumetric and deviatoric strain fields, obtained from digital volume correlation between neighbouring μCT volumes. Each strain field consists of a 32-bit 3D image file (.tif) in pixels with an edge length of 316.4 μm, labelled with its scan increment. Also included are (i) .csv files, containing the mechanical stress and strain time-series, the time and mechanical data at which each μCT volume was scanned, and the acoustic emissions event rate data, and (ii) .zip files containing times and waveforms for the acoustic emissions and ultrasonic velocity surveys as .ascii files. The .zip and .xlsx files are labelled with the sample name, the data type (grey-scale, strain-volumetric, strain-deviatoric, seismic, mechanical, mechCT, eventrateAE) and the sequential scan number (grey-scale only) according to the following convention: sample_datatype_scan#.

We acknowledge Diamond Light Source for time on beamline I12-JEEP under proposal MG22517. This work is supported by the UK's Natural Environment Research Council (NERC) through the CATFAIL project NE/R001693/1 Catastrophic failure: what controls precursory localisation in rocks?

Dataset content dates 11/09/2019 to 16/09/2019
Dataset spatial coverage Not Applicable
Dataset supply format Images (TIF)
Text files (ASCII, CSV)
Dataset language English-United Kingdom
Dataset discovery metadata record Discovery Link to the dataset's BGS Discovery Metadata record
Dataset publisher NERC EDS National Geoscience Data Centre
Dataset publication date 12/05/2022
Dataset digital object identifier(DOI) 10.5285/56c7802c-93db-4f0f-8b89-e18e10215633
Dataset citation text Cartwright-Taylor, A., Butler, I.B., Fusseis, F., Ling, M., Andò, E., Mangriotis, MD., Main, I.G., Rizzo, R.E., Marti, S., Leung, D.D., Magdysyuk, O.V. (2022). Micromechanics of shear failure in a porous rock: a combined dataset of high-resolution time-resolved 3D x-ray micro-tomography volumes and local 3D strain fields with contemporaneous acoustic emissions and ultrasonic velocity survey waveforms. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/56c7802c-93db-4f0f-8b89-e18e10215633
Constraints and terms of use This data set is available under Open Government Licence, subject to the following acknowledgement accompanying any reproduced materials: "Contains data supplied by permission of the Natural Environment Research Council [YEAR]".
Access the dataset https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item173296
Further information https://blogs.ed.ac.uk/alexiscartwrighttaylor