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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

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?

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Identification info

Metadata Language
English (en)
Dataset Reference Date ()
2022-04-22
Identifier

http://data.bgs.ac.uk/id/dataHolding/13607932

 

University of Edinburgh

-

Professor Ian Main

(

School of Geosciences

)

Grant Institute, The King's Buildings, James Hutton Road

,

Edinburgh

,

EH9 3FE

,
 

University of Edinburgh

-

Professor Ian Main

(

School of Geosciences

)

Grant Institute, The King's Buildings, James Hutton Road

,

Edinburgh

,

EH9 3FE

,
 

University of Edinburgh

-

Alexis Cartwright-Taylor

(

School of GeoSciences

)

Grant Institute, The King's Buildings, James Hutton Road

,

Edinburgh

,

EH9 3FE

,
 

University of Edinburgh

-

Ian B. Butler

(

School of Geosciences

)

Grant Institute, The King's Buildings, James Hutton Road

,

Edinburgh

,

EH9 3FE

,
 

University of Edinburgh

-

Florian Fusseis

(

School of GeoSciences

)

Grant Institute, The King's Buildings, James Hutton Road

,

Edinburgh

,

EH9 3FE

,
 

Edinburgh Hacklab

-

Martin Ling


 

École Polytechnique Fédérale de Lausanne

-

Edward Andò


 

University of Edinburgh

-

Maria-Daphne Mangriotis


 

University of Edinburgh

-

Roberto E. Rizzo


 

University of Edinburgh

-

Sina Marti


 

University of Edinburgh

-

Derek D. Leung


 

Diamond Light Source

-

Oxana V. Magdysyuk


 

British Geological Survey

-

Enquiries


 

British Geological Survey

-

Enquiries


Maintenance and update frequency
notApplicable
GEMET - INSPIRE themes
  • Geology
BGS Thesaurus of Geosciences
  • Sandstone

  • Rock deformation

  • Faulting

  • Compression tests

  • Acoustic emission

Keywords
  • NERC_DDC

Limitations on Public Access
otherRestrictions
Other constraints
licenceOGL
Other constraints
Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
Use constraints
otherRestrictions
Other constraints

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints

Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Topic category
  • Geoscientific information
Begin date
2019-09-11
End date
2019-09-16
 

Spatial Reference System

No information provided.

Distribution Information

Data format
  • image (TIF)

    ()

  • text files (CSV)

    ()

  • text files (ASCII)

    ()

Resource Locator
Data
Resource Locator
Digital Object Identifier (DOI)
Resource Locator
Published Paper
Resource Locator
Data
Resource Locator
Digital Object Identifier (DOI)
Resource Locator
Published Paper
 
Quality Scope
nonGeographicDataset
Other

non geographic dataset

Report

Dataset Reference Date ()
2011
Explanation

See the referenced specification

Degree

Report

Dataset Reference Date ()
2010-12-08
Explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Degree
Statement

The samples underwent triaxial deformation at 25 MPa confining pressure and 5 MPa pore pressure in Stór Mjölnir, our x-ray transparent rock deformation rig with integrated acoustic monitoring (Cartwright-Taylor et al., in prep.). The samples were both loaded initially at a constant strain rate of 10⁻⁵ s⁻¹. CL04 continued to be loaded at a constant strain rate of 10⁻⁵ s⁻¹ until it experienced abrupt shear failure. CL10 was loaded in this way until detection of sufficient acoustic emissions to maintain a constant AE event rate of 1 AE s⁻¹, whereupon the sample experienced yield and slow shear failure. In each case, tomographic volumes of the whole sample, comprising overlapping scans of the top and bottom, were acquired every 85 s. At each end of the sample 0.3 mm was not captured due to limits on the x-ray field of view .

Metadata

File identifier
decc7c0a-c257-47e2-e053-0937940a8fe8 XML
Metadata Language
English (en)
Resource type
nonGeographicDataset
Hierarchy level name

non geographic dataset

Metadata Date
2023-03-21
Metadata standard name
UK GEMINI
Metadata standard version

2.3

 

British Geological Survey


Environmental Science Centre,Keyworth

,

NOTTINGHAM

,

NOTTINGHAMSHIRE

,

NG12 5GG

,

United Kingdom

+44 115 936 3100
 
 

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