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Article: Crack initiation, propagation and coalescence in rock-like material containing two flaws: A numerical study based on bonded-particle model approach

TitleCrack initiation, propagation and coalescence in rock-like material containing two flaws: A numerical study based on bonded-particle model approach
Authors
KeywordsMicro-cracking zone
Bonded-particle model (BPM)
Crack coalescence category
Crack type
Issue Date2013
Citation
Rock Mechanics and Rock Engineering, 2013, v. 46, n. 5, p. 1001-1021 How to Cite?
AbstractCracking and coalescence behavior in a rectangular rock-like specimen containing two parallel (stepped and coplanar) pre-existing open flaws under uniaxial compression load has been numerically studied by a parallel bonded-particle model, which is a type of bonded-particle model. Crack initiation and propagation from two flaws replicate most of the phenomena observed in prior physical experiments, such as the type (tensile/shear) and the initiation stress of the first crack, as well as the coalescence pattern. Eight crack coalescence categories representing different crack types and trajectories are identified. New coalescence categories namely "New 1" and "New 2", which are first observed in the present simulation, are incorporated into categories 3 and 4, and category 5 previously proposed by the MIT Rock Mechanics Research Group, respectively. The flaw inclination angle (β), the ligament length (L) (spacing between two flaws) and the bridging angle (α) (inclination of a line linking up the inner flaw tips, between two flaws) have different effects on the coalescence patterns, coalescence stresses (before, at or post the peak stress) as well as peak strength of specimens. Some insights on the coalescence processes, such as the initiation of cracks in the intact part of specimens at a distance away from the flaw tips, and coalescence due to the development and linkage of a number of steeply inclined to vertical macro-tensile cracks are revealed by the present numerical study. © 2012 Springer-Verlag Wien.
Persistent Identifierhttp://hdl.handle.net/10722/214012
ISSN
2015 Impact Factor: 2.386
2015 SCImago Journal Rankings: 1.939

 

DC FieldValueLanguage
dc.contributor.authorZhang, Xiao Ping-
dc.contributor.authorWong, Louis Ngai Yuen-
dc.date.accessioned2015-08-19T13:41:32Z-
dc.date.available2015-08-19T13:41:32Z-
dc.date.issued2013-
dc.identifier.citationRock Mechanics and Rock Engineering, 2013, v. 46, n. 5, p. 1001-1021-
dc.identifier.issn0723-2632-
dc.identifier.urihttp://hdl.handle.net/10722/214012-
dc.description.abstractCracking and coalescence behavior in a rectangular rock-like specimen containing two parallel (stepped and coplanar) pre-existing open flaws under uniaxial compression load has been numerically studied by a parallel bonded-particle model, which is a type of bonded-particle model. Crack initiation and propagation from two flaws replicate most of the phenomena observed in prior physical experiments, such as the type (tensile/shear) and the initiation stress of the first crack, as well as the coalescence pattern. Eight crack coalescence categories representing different crack types and trajectories are identified. New coalescence categories namely "New 1" and "New 2", which are first observed in the present simulation, are incorporated into categories 3 and 4, and category 5 previously proposed by the MIT Rock Mechanics Research Group, respectively. The flaw inclination angle (β), the ligament length (L) (spacing between two flaws) and the bridging angle (α) (inclination of a line linking up the inner flaw tips, between two flaws) have different effects on the coalescence patterns, coalescence stresses (before, at or post the peak stress) as well as peak strength of specimens. Some insights on the coalescence processes, such as the initiation of cracks in the intact part of specimens at a distance away from the flaw tips, and coalescence due to the development and linkage of a number of steeply inclined to vertical macro-tensile cracks are revealed by the present numerical study. © 2012 Springer-Verlag Wien.-
dc.languageeng-
dc.relation.ispartofRock Mechanics and Rock Engineering-
dc.subjectMicro-cracking zone-
dc.subjectBonded-particle model (BPM)-
dc.subjectCrack coalescence category-
dc.subjectCrack type-
dc.titleCrack initiation, propagation and coalescence in rock-like material containing two flaws: A numerical study based on bonded-particle model approach-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s00603-012-0323-1-
dc.identifier.scopuseid_2-s2.0-84883456020-
dc.identifier.hkuros259276-
dc.identifier.volume46-
dc.identifier.issue5-
dc.identifier.spage1001-
dc.identifier.epage1021-

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