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Article: Parametric Study of the Smooth Joint Contact Model on the Mechanical Behavior of Jointed Rock

TitleParametric Study of the Smooth Joint Contact Model on the Mechanical Behavior of Jointed Rock
Authors
Issue Date2018
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, 2018, v. 42 n. 2, p. 358-376 How to Cite?
AbstractThe smooth-joint contact model based on distinct element method has been widely used to represent discontinuity in the simulation of fractured rock mass, but there is rare efficient guidance for the selection of proper parameters of smooth-joint contact model, which is the basement for using this model properly. In this paper, the effect of smooth joint parameters on the macroscopic properties and failure mechanism of jointed rock under triaxial compression test is investigated. The numerical results reveal that the friction coefficient of smooth joint plays a dominant role in controlling mechanical behaviors. The stiffness of smooth joint has a relative small influence on the mechanical behaviors. Poisson ratio decreases with the reduction of normal stiffness but increases with the reduction of shear stiffness. The reduction of smooth joint strength, which is determined by normal strength, cohesion, and friction angle of smooth joint, contributes to the breakage of bonded smooth joint and ultimately decreases the strength of the specimen. We proposed a detailed calibration process for smooth-joint contact model according to the relationship between smooth-joint parameters and mechanical properties. By following this process, the numerical results are validated against corresponding experimental results and good agreement between them can be found in stress-strain curves and failure modes of different joint orientations. Further analyses from the microperspective are performed by looking at transmission of contact force, the nature and distribution of microcracks, and the particle displacement to show the failure process and failure modes.
Persistent Identifierhttp://hdl.handle.net/10722/249617
ISSN
2017 Impact Factor: 2.219
2015 SCImago Journal Rankings: 1.676
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHu, W-
dc.contributor.authorKwok, CY-
dc.contributor.authorDuan, K-
dc.contributor.authorWang, T-
dc.date.accessioned2017-11-21T03:04:41Z-
dc.date.available2017-11-21T03:04:41Z-
dc.date.issued2018-
dc.identifier.citationInternational Journal for Numerical and Analytical Methods in Geomechanics, 2018, v. 42 n. 2, p. 358-376-
dc.identifier.issn0363-9061-
dc.identifier.urihttp://hdl.handle.net/10722/249617-
dc.description.abstractThe smooth-joint contact model based on distinct element method has been widely used to represent discontinuity in the simulation of fractured rock mass, but there is rare efficient guidance for the selection of proper parameters of smooth-joint contact model, which is the basement for using this model properly. In this paper, the effect of smooth joint parameters on the macroscopic properties and failure mechanism of jointed rock under triaxial compression test is investigated. The numerical results reveal that the friction coefficient of smooth joint plays a dominant role in controlling mechanical behaviors. The stiffness of smooth joint has a relative small influence on the mechanical behaviors. Poisson ratio decreases with the reduction of normal stiffness but increases with the reduction of shear stiffness. The reduction of smooth joint strength, which is determined by normal strength, cohesion, and friction angle of smooth joint, contributes to the breakage of bonded smooth joint and ultimately decreases the strength of the specimen. We proposed a detailed calibration process for smooth-joint contact model according to the relationship between smooth-joint parameters and mechanical properties. By following this process, the numerical results are validated against corresponding experimental results and good agreement between them can be found in stress-strain curves and failure modes of different joint orientations. Further analyses from the microperspective are performed by looking at transmission of contact force, the nature and distribution of microcracks, and the particle displacement to show the failure process and failure modes.-
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.titleParametric Study of the Smooth Joint Contact Model on the Mechanical Behavior of Jointed Rock-
dc.typeArticle-
dc.identifier.emailKwok, CY: fkwok8@hku.hk-
dc.identifier.authorityKwok, CY=rp01344-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/nag.2751-
dc.identifier.hkuros283384-
dc.identifier.volume42-
dc.identifier.issue2-
dc.identifier.spage358-
dc.identifier.epage376-
dc.identifier.isiWOS:000419501400008-
dc.publisher.placeUnited Kingdom-

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