Experimental Investigation of Fracture Process Zone in Rocks Damaged Under Cyclic Loadings

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dc.authoridGhamgosar, Morteza/0000-0003-3176-6220
dc.authoridWilliams, David/0000-0002-4311-0678
dc.contributor.authorGhamgosar, M.
dc.contributor.authorErarslan, N.
dc.contributor.authorWilliams, D. J.
dc.date.accessioned2025-01-06T17:37:20Z
dc.date.available2025-01-06T17:37:20Z
dc.date.issued2017
dc.description.abstractCompared with other materials, most rocks generally fail in a brittle fashion rather than exhibiting yielding or purely plastic deformation. However, the initiation and coalescence of micro-cracks in the nonlinear region, known as the 'fracture process zone' (FPZ), are the primary reason for fracture propagation in rocks. Different elasticity-related models proposed for determining the features of the FPZ have not achieved an adequate understanding of its various fracture patterns. Based on previous experiments and numerical models, micro-crack density has been shown to be a function of loading history and to vary depending on whether the loading is monotonic or cyclic. The aim of the study reported here was to examine the different patterns of the FPZ under various types of cyclic loading and to quantitatively define damage and fracture patterns through the grains or rock matrix. Considerable laboratory testing was conducted, and fractured samples were investigated by computerised tomography scanning, supported by thin-section analysis. In the study, two different types of cyclic loading were tested: stepped and continuous. A diametral compressive loading was applied at predetermined amplitude and frequency with the continuous cyclic loading. The applied cyclic diametral compressive load was returned to the original level after each step, and at the next step, the amplitude started from zero, with stepped cyclic loading (SCL). An average 30 % strength reduction was found due to the SCL and emergence of high micro-fracture density in the FPZ. We presume that hard rock breakage techniques will be improved, especially for rock-cutting technologies, such as drag bits and oscillating disc cutting, by understanding the effects of cyclic loading on rock strength.
dc.description.sponsorshipNewcrest Mining Limited
dc.description.sponsorshipNewcrest Mining Limited is acknowledged for a scholarship to the first author during the course of the research on which this paper was in part based. Joy Global is likewise acknowledged for providing the monzonite core samples from Cadia Valley that were used for testing purposes. Golder Associates is acknowledged for providing Brisbane tuff core samples from the Clem7 tunnel project in Brisbane that were used for testing purposes. Professor Arcady Dyskin, Winthrop Professor from The University of Western Australia; Professor Eduardo Marques; Dr Penny Stuart; and Emily Douglas are also acknowledged for their valuable efforts. Authors also would like to thank the Scientific and Technological Research Council of Turkey (TUBITAK) BIDEB 2232 program.
dc.identifier.doi10.1007/s11340-016-0216-4
dc.identifier.endpage113
dc.identifier.issn0014-4851
dc.identifier.issn1741-2765
dc.identifier.issue1
dc.identifier.scopus2-s2.0-84989863824
dc.identifier.scopusqualityQ2
dc.identifier.startpage97
dc.identifier.urihttps://doi.org/10.1007/s11340-016-0216-4
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2197
dc.identifier.volume57
dc.identifier.wosWOS:000392290400008
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofExperimental Mechanics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectCyclic loading
dc.subjectComputerised tomography (CT) scans
dc.subjectDynamic rock cutting
dc.subjectFracture process zone (FPZ)
dc.subjectMicro-fracture
dc.subjectRock fracture mechanics
dc.titleExperimental Investigation of Fracture Process Zone in Rocks Damaged Under Cyclic Loadings
dc.typeArticle

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