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Article: Micromechanical analysis of the failure process of brittle rock

TitleMicromechanical analysis of the failure process of brittle rock
Authors
Issue Date2015
PublisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/3312
Citation
International Journal for Numerical and Analytical Methods in Geomechanics, 2015, v. 39 n. 6, p. 618–634 How to Cite?
AbstractThe failure process of brittle rock submitted to a compression state of stress with different confining pressures is investigated in this paper based on discrete element method (DEM) simulations. In the DEM model, the rock sample is represented by bonding rigid particles at their contact points. The numerical model is first calibrated by comparing the macroscopic response with the macroscopic response of Beishan granite obtained from laboratory tests. After the validation of numerical model in terms of macroscopic responses, the failure process of the DEM model under unconfined and confined compression is studied in micro-scale in detail. The contact force network and its relation to the development of micro-cracks and evolution of major fractures are studied. Confining pressure will prohibit the development of tensile cracks and hence alter the failure patterns. An in-depth analysis of micro-scale response is carried out, including the orientation distribution and probability density of stress acting on parallel bonds, the effect of particle size heterogeneity on bond breakage and the evolution of fabric tensor and coordination number of parallel bond. The proposed micromechanical analysis will allow us to extract innovative features emerged from the stresses and crack evolution in brittle rock failure process. Copyright © 2014 John Wiley & Sons, Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/202660
ISSN
2015 Impact Factor: 1.758
2015 SCImago Journal Rankings: 1.676

 

DC FieldValueLanguage
dc.contributor.authorDuan, K-
dc.contributor.authorKwok, CY-
dc.contributor.authorTham, LG-
dc.date.accessioned2014-09-19T09:14:13Z-
dc.date.available2014-09-19T09:14:13Z-
dc.date.issued2015-
dc.identifier.citationInternational Journal for Numerical and Analytical Methods in Geomechanics, 2015, v. 39 n. 6, p. 618–634-
dc.identifier.issn0363-9061-
dc.identifier.urihttp://hdl.handle.net/10722/202660-
dc.description.abstractThe failure process of brittle rock submitted to a compression state of stress with different confining pressures is investigated in this paper based on discrete element method (DEM) simulations. In the DEM model, the rock sample is represented by bonding rigid particles at their contact points. The numerical model is first calibrated by comparing the macroscopic response with the macroscopic response of Beishan granite obtained from laboratory tests. After the validation of numerical model in terms of macroscopic responses, the failure process of the DEM model under unconfined and confined compression is studied in micro-scale in detail. The contact force network and its relation to the development of micro-cracks and evolution of major fractures are studied. Confining pressure will prohibit the development of tensile cracks and hence alter the failure patterns. An in-depth analysis of micro-scale response is carried out, including the orientation distribution and probability density of stress acting on parallel bonds, the effect of particle size heterogeneity on bond breakage and the evolution of fabric tensor and coordination number of parallel bond. The proposed micromechanical analysis will allow us to extract innovative features emerged from the stresses and crack evolution in brittle rock failure process. Copyright © 2014 John Wiley & Sons, Ltd.-
dc.languageeng-
dc.publisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/3312-
dc.relation.ispartofInternational Journal for Numerical and Analytical Methods in Geomechanics-
dc.rightsInternational Journal for Numerical and Analytical Methods in Geomechanics. Copyright © John Wiley & Sons Ltd.-
dc.titleMicromechanical analysis of the failure process of brittle rock-
dc.typeArticle-
dc.identifier.emailKwok, CY: fkwok8@hku.hk-
dc.identifier.emailTham, LG: hrectlg@hku.hk-
dc.identifier.authorityKwok, CY=rp01344-
dc.identifier.authorityTham, LG=rp00176-
dc.identifier.doi10.1002/nag.2329-
dc.identifier.hkuros236153-
dc.identifier.volume39-
dc.identifier.issue6-
dc.identifier.spage618-
dc.identifier.epage634-
dc.publisher.placeUnited Kingdom-

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