Computational Mechanics of Discontinua

Munjiza, Antonio; Knight, Earl E.; Rougier, Esteban

doi:10.1002/9781119971160

Cited by 156 publications

(144 citation statements)

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“…Extensive developments and applications of the FEMDEM method have been conducted in the past decade or so with different versions having emerged such as the code collaboratively developed by Queen Mary University of London (UK) and Los Alamos National Laboratory in the USA (Munjiza et al 2011(Munjiza et al , 2013Rougier et al 2014), the YGeo and Irazu by the University of Toronto, Canada (Mahabadi et al 2012;Lisjak and Grasselli 2014;Lisjak et al 2017), and the Solidity platform by Imperial College London (Xiang et al 2009a, b;Guo et al 2016;Lei 2016;Lei et al 2016). The FEMDEM model that accommodates the finite strain elasticity coupled with a smeared crack model is able to capture the complex behaviour of fractured rocks involving deformation, displacement, rotation, interaction, fracturing and fragmentation.…”

Section: Finite-discrete Element Methods (Femdem)mentioning

confidence: 99%

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

et al. 2017

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A study about the influence of polyaxial (true-triaxial) stresses on the permeability of a three-dimensional (3D) fractured rock layer is presented. The 3D fracture system is constructed by extruding a two-dimensional (2D) outcrop pattern of a limestone bed that exhibits a ladder structure consisting of a Bthrough-going^joint set abutted by later-stage short fractures. Geomechanical behaviour of the 3D fractured rock in response to in-situ stresses is modelled by the finite-discrete element method, which can capture the deformation of matrix blocks, variation of stress fields, reactivation of pre-existing rough fractures and propagation of new cracks. A series of numerical simulations is designed to load the fractured rock using various polyaxial in-situ stresses and the stress-dependent flow properties are further calculated. The fractured layer tends to exhibit stronger flow localisation and higher equivalent permeability as the far-field stress ratio is increased and the stress field is rotated such that fractures are preferentially oriented for shearing. The shear dilation of pre-existing fractures has dominant effects on flow localisation in the system, while the propagation of new fractures has minor impacts. The role of the overburden stress suggests that the conventional 2D analysis that neglects the effect of the out-of-plane stress (perpendicular to the bedding interface) may provide indicative approximations but not fully capture the polyaxial stress-dependent fracture network behaviour. The results of this study have important implications for understanding the heterogeneous flow of geological fluids (e.g. groundwater, petroleum) in subsurface and upscaling permeability for largescale assessments.

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Section: Finite-discrete Element Methods (Femdem)mentioning

confidence: 99%

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

et al. 2017

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“…U novije vrijeme postojalo je dosta pokušaja da se iskoriste prednosti metode konačnih i diskretnih elemenata [11][12][13]. Jedna od takvih metoda je i kombinirana metoda konačno-diskretnih elemenata koju je razvio Ante Munjiza [14,15]. Ta se metoda zasniva na simulaciji ponašanja velikog broja diskretnih elemenata koji se mogu naći u međusobnoj interakciji.…”

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Analiza stabilnosti suho zidanih kamenih nadvoja kombiniranom metodom konačno-diskretnih elemenata

2015

JCE

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Analiza stabilnosti suho zidanih kamenih nadvoja kombiniranom metodom konačno-diskretnih elemenata U ovom radu prikazana je primjena kombinirane metode konačno-diskretnih elemenata (FEM/DEM) u analizi potresne otpornosti suho zidanih kamenih nadvoja. Sedam kamenih suhozida s različitim tipovima kamenih nadvoja izloženo je djelovanju linearno rastućeg horizontalnog ubrzanja podloge, te potresnom opterećenju. Na temelju dobivenih rezultata analizirana je potresna otpornost te mehanizmi sloma pojedinog tipa nadvoja. Također su komentirane i predložene preporuke za oblikovanje kamenih nadvoja s ciljem postizanja što veće potresne otpornosti. Stability analysis of dry stone lintels using combined finite-discrete element methodThe use of the combined finite-discrete element method (FEM/DEM) in the analysis of seismic resistance of dry stone lintels is presented in this paper. Seven dry stone masonry walls with different types of stone lintels were exposed to linearly increasing horizontal base acceleration and to seismic excitation. Based on the analysis results, the seismic resistance and failure mechanisms were analysed for each type of lintel. Recommendations for the design of stone lintels, aimed at achieving the greatest possible seismic resistance, were also discussed and presented.

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“…The combined finite-discrete element method (FDEM), presented by Munjiza [11][12][13], merges finite element tools and technics with discrete element algorithms. Finite element-based analysis of continua is merged with discrete element-based transient dynamics, contact detection, and contact interaction solutions.…”

Section: Fdem Numerical Algorithmmentioning

confidence: 99%

“…The main feature of these numerical models is that, for the type of load from which their basic functions have been derived, they show correspondence with analytical solution with very few or even only one final element, while requiring a much larger number of finite elements for a different type of load. The combined finite discrete element method (FDEM) proposed by Munjiza [11][12][13] constitutes one of the methods that are currently widely applied in the analysis of engineering structures.…”

Section: State Of the Artmentioning

confidence: 99%

GPU based parallel FDEM for analysis of cable structures

2018

JCE

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GPU based parallel FDEM for analysis of cable structuresA combined finite-discrete element method, adapted for the analysis of a parallel cable element model using graphic cards, is presented in the paper. The basic objective is to speed up sequential computation time by one or two orders of magnitude. Paralelni model kabela za grafičke kartice baziran na metodi konačno diskretnih elemenata U radu je prikazana adaptacija kombinirane metode konačno diskretnih elemenata za paralelni model kabelskog elementa pomoću grafičkih kartica. Osnovni cilj je ubrzanje proračunskog vremena serijskog koda za jedan ili dva reda veličine. Razvijeno rješenje je implementirano unutar slobodno dostupnog FDEM Y koda. Mjerenje performansi razvijenog rješenja kao i diskusija o tome prikazani su na jednostavnim primjerima. In der Arbeit wird die Anpassung der kombinierten Methode der finiten diskreten Elemente für ein paralleles Kabelmodell anhand von Grafikkarten dargestellt. Der Schwerpunkt lag dabei auf der Beschleunigung der Berechnungszeit des Seriencodes um eine oder zwei Größenordnungen. Die entwickelte Lösung wurde innerhalb der frei zugänglichen FDEM Y Codes integriert. An einfachen Beispielen wurden die Messung der Leistungen der entwickelten Lösung sowie entsprechende Diskussionen dargestellt.

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Computational Mechanics of Discontinua

Cited by 156 publications

References 0 publications

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

Analiza stabilnosti suho zidanih kamenih nadvoja kombiniranom metodom konačno-diskretnih elemenata

GPU based parallel FDEM for analysis of cable structures

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