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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Cited articles

Ahamed, M. A. A., Perera, M. S. A., Matthai, S. K., Ranjith, P. G., and Dong-yin, L.: Coal composition and structural variation with rank and its influence on the coal-moisture interactions under coal seam temperature conditions – A review article, J. Petrol. Sci. Eng., 180, 901–917,, 2019. 
Aharonov, E. and Scholz, C. H.: A Physics-Based Rock Friction Constitutive Law: Steady State Friction, J. Geophys. Res.-Sol. Ea., 123, 1591–1614,, 2018. 
Baysal, M., Yürüm, A., Yıldız, B., and Yürüm, Y.: Structure of some western Anatolia coals investigated by FTIR, Raman, 13C solid state NMR spectroscopy and X-ray diffraction, Int. J. Coal Geol., 163, 166–176,, 2016. 
Beyssac, O., Rouzaud, J.-N., Goffé, B., Brunet, F., and Chopin, C.: Graphitization in a high-pressure, low-temperature metamorphic gradient: a Raman microspectroscopy and HRTEM study, Contrib. Mineral. Petr., 143, 19–31,, 2002. 
Beyssac, O., Goffé, B., Petitet, J.-P., Froigneux, E., Moreau, M., and Rouzaud, J.-N.: On the characterization of disordered and heterogeneous carbonaceous materials by Raman spectroscopy, Spectrochim. Acta A, 59, 2267–2276,, 2003. 
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.