Assessment of cyclic deformation and critical stress amplitude of jointed rocks via cyclic triaxial testing

Peellage, WH; Fatahi, B; Rasekh, H

Assessment of cyclic deformation and critical stress amplitude of jointed rocks via cyclic triaxial testing

Peellage, WH Fatahi, B

Rasekh, H

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Rock Mechanics and Geotechnical Engineering, 2023
Issue Date:: 2023-01-01

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Field	Value	Language
dc.contributor.author	Peellage, WH
dc.contributor.author	Fatahi, B https://orcid.org/0000-0002-7920-6946
dc.contributor.author	Rasekh, H https://orcid.org/0000-0003-2064-0753
dc.date.accessioned	2023-05-04T08:16:16Z
dc.date.available	2023-05-04T08:16:16Z
dc.date.issued	2023-01-01
dc.identifier.citation	Journal of Rock Mechanics and Geotechnical Engineering, 2023
dc.identifier.issn	1674-7755
dc.identifier.uri	http://hdl.handle.net/10453/170196
dc.description.abstract	Jointed rock specimens with a natural replicated joint surface oriented at a mean dip angle of 60° were prepared, and a series of cyclic triaxial tests was performed at different confining pressures and cyclic deviatoric stress amplitudes. The samples were subjected to 10,000 loading-unloading cycles with a frequency of 8 Hz. At each level of confining pressure, the applied cyclic deviatoric stress amplitude was increased incrementally until excessive deformation of the jointed rock specimen was observed. Analysis of the test results indicated that there existed a critical cyclic deviatoric stress amplitude (i.e. critical dynamic deviatoric stress) beyond which the jointed rock specimens yielded. The measured critical dynamic deviatoric stress was less than the corresponding static deviatoric stress. At cyclic deviatoric stress amplitudes less than the critical dynamic deviatoric stress, minor cumulative residual axial strains were observed, resulting in hysteretic damping. However, for cyclic deviatoric stresses beyond the critical dynamic deviatoric stress, the plastic strains increased promptly, and the resilient moduli degraded rapidly during the initial loading cycles. Cyclic triaxial test results showed that at higher confining pressures, the ultimate residual axial strain attained by the jointed rock specimen decreased, the steady-state dissipated energy density and steady-state damping ratio per load cycle decreased, while steady-state resilient moduli increased.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Rock Mechanics and Geotechnical Engineering
dc.relation.isbasedon	10.1016/j.jrmge.2023.02.001
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.rights	This is an open access article under the CC BY- NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
dc.subject	0905 Civil Engineering
dc.title	Assessment of cyclic deformation and critical stress amplitude of jointed rocks via cyclic triaxial testing
dc.type	Journal Article
utslib.for	0905 Civil Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
pubs.organisational-group	/University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
utslib.copyright.status	recently_added	*
dc.date.updated	2023-05-04T08:16:14Z
pubs.publication-status	Published

Abstract:

Jointed rock specimens with a natural replicated joint surface oriented at a mean dip angle of 60° were prepared, and a series of cyclic triaxial tests was performed at different confining pressures and cyclic deviatoric stress amplitudes. The samples were subjected to 10,000 loading-unloading cycles with a frequency of 8 Hz. At each level of confining pressure, the applied cyclic deviatoric stress amplitude was increased incrementally until excessive deformation of the jointed rock specimen was observed. Analysis of the test results indicated that there existed a critical cyclic deviatoric stress amplitude (i.e. critical dynamic deviatoric stress) beyond which the jointed rock specimens yielded. The measured critical dynamic deviatoric stress was less than the corresponding static deviatoric stress. At cyclic deviatoric stress amplitudes less than the critical dynamic deviatoric stress, minor cumulative residual axial strains were observed, resulting in hysteretic damping. However, for cyclic deviatoric stresses beyond the critical dynamic deviatoric stress, the plastic strains increased promptly, and the resilient moduli degraded rapidly during the initial loading cycles. Cyclic triaxial test results showed that at higher confining pressures, the ultimate residual axial strain attained by the jointed rock specimen decreased, the steady-state dissipated energy density and steady-state damping ratio per load cycle decreased, while steady-state resilient moduli increased.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/170196