Browning, J;
Meredith, PG;
Stuart, C;
Harland, S;
Healy, D;
Mitchell, TM;
(2018)
A Directional Crack Damage Memory Effect in Sandstone Under True Triaxial Loading.
Geophysical Research Letters
, 45
(14)
pp. 6878-6886.
10.1029/2018GL078207.
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Abstract
Crack damage leading to failure in rocks can be accumulated through cyclic stressing in the crust. However, the vast majority of experimental studies to investigate cyclic stressing apply conventional triaxial stress states (σ1 > σ2 = σ3), while in nature the state of stress in the crust is generally truly triaxial (σ1 > σ2 > σ3). Furthermore, the magnitude of these crustal stresses can vary over time and their orientations can also rotate over time, generating multiple crack populations and bulk anisotropic crack damage. We investigate the evolution of crack damage under both conventional and true triaxial stress conditions by sequentially and cyclically varying stresses in all three principal directions on cubic samples of dry sandstone using independently controlled stress paths. We have measured, simultaneously with stress, the bulk acoustic emission output, as a proxy for crack damage. We report a directionally controlled crack damage memory effect which has implications for the approach to failure in complex tectonic stress environments.
| Type: | Article |
|---|---|
| Title: | A Directional Crack Damage Memory Effect in Sandstone Under True Triaxial Loading |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2018GL078207 |
| Publisher version: | https://doi.org/10.1029/2018GL078207 |
| Language: | English |
| Additional information: | © 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Geology, ELASTIC-MODULI, STRESS, EVOLUTION, FAILURE, ROCKS, VOLCANO, FIELDS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10055770 |
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