Frictional slip weakening and shear-enhanced crystallinity in simulated coal fault gouges at slow slip rates

Fan, Caiyuan; Liu, Jinfeng; Hunfeld, Luuk B.; Spiers, Christopher J.

doi:https://doi.org/10.5194/se-11-1399-2020

Articles | Volume 11, issue 4

https://doi.org/10.5194/se-11-1399-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Thermo-hydro-mechanical–chemical (THMC) processes in natural...

https://doi.org/10.5194/se-11-1399-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 11, issue 4

Research article

|

26 Jul 2020

Research article |

| 26 Jul 2020

Frictional slip weakening and shear-enhanced crystallinity in simulated coal fault gouges at slow slip rates

Caiyuan Fan, Jinfeng Liu, Luuk B. Hunfeld, and Christopher J. Spiers

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Final revised paper (published on 26 Jul 2020)
Preprint (discussion started on 09 Apr 2020)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Review Comment', Anonymous Referee #1, 09 Apr 2020
- AC1: 'Reply to the comments from the Reviewer 1', Jinfeng Liu, 19 Jun 2020
RC2: 'Review result', Oohashi Kiyokazu, 04 May 2020
- AC2: 'Reply to the comments from Oohashi Kiyokazu and Jianye Chen', Jinfeng Liu, 19 Jun 2020
EC1: 'Remarks to the authors', Jianye Chen, 22 May 2020
- AC2: 'Reply to the comments from Oohashi Kiyokazu and Jianye Chen', Jinfeng Liu, 19 Jun 2020
- AC1: 'Reply to the comments from the Reviewer 1', Jinfeng Liu, 19 Jun 2020
AC2: 'Reply to the comments from Oohashi Kiyokazu and Jianye Chen', Jinfeng Liu, 19 Jun 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Jinfeng Liu on behalf of the Authors (20 Jun 2020) Author's response Manuscript

ED: Publish as is (23 Jun 2020) by Jianye Chen

ED: Publish as is (26 Jun 2020) by Susanne Buiter (Executive editor)

AR by Jinfeng Liu on behalf of the Authors (30 Jun 2020)

Short summary

Coal is an important source rock for natural gas recovery, and its frictional properties play a role in induced seismicity. We performed experiments to investigate the frictional properties of bituminous coal, and our results show that the frictional strength of coal became significantly weakened with slip displacement, from a peak value of 0.5 to a steady-state value of 0.3. This may be caused by the development of shear bands with internal shear-enhanced molecular structure.