| Title: | Numerical simulation of intact rock behaviour via the continuum and Voronoi tesselletion models : a sensitivity analysis |
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| Authors: | ID Fabjan, Teja (Author)
ID Mas Ivars, Diego (Author)
ID Vukadin, Vladimir (Author)
ID Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Copyright holder) |
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| Files: |  Acta_geotechnica_Slovenica_2015_Fabjan,_Mas_Ivars,_Vukadin_Numerical_simulation_of_intact_rock_behaviour_via_the_continuum_and_Voronoi_t.pdf (1,57 MB)
MD5: C5EF1F85C1D5087BD212FFD85ABB7C55
PID: 20.500.12556/dkum/2aaa48f4-8444-495c-bb4b-f086a6916059
 http://fgserver3.fg.um.si/journal-ags/2015-2/article-1.asp
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
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| Abstract: | The numerical simulation of intact rock microstructure and its influence on macro-scale behaviour has received a lot of attention in the research community in recent years. Generating a grain-like structure with polygonal area contacts is one of the avenues explored for describing the rock’s microstructure. A Voronoi tessellation implemented in the Universal Distinct-Element Code (UDEC) is used to generate models with a polygonal microstructure that represent intact rock. The mechanical behaviour of the Voronoi polygons is defined by micro-properties, which cannot be measured directly in the laboratory. A numerical calibration procedure is needed to produce the macroscopic response of a model that corresponds to the material behaviour measured during a laboratory experiment. In this research, Brazilian, direct tensile, uniaxial compressive and biaxial test models are constructed to simulate the intact rock behaviour under a standard laboratory stress. An extensive series of parametric sensitivity analyses are executed in order to understand the influence of the input micro-properties on every model test behaviour and predict the relation between the micro-properties and the model’s macro response. The results can be treated as general guidelines for a complete and efficient intact rock calibration procedure. In parallel, a continuum-based model using the Mohr-Coulomb constitutive relationship is running as a benchmark. It has been shown that the Voronoi-based models through their microstructure approach better reproduce the Brazilian to direct tensile strength ratio, and show a better representation of the dilation, crack pattern and post-peak behaviour in comparison to continuum models. |
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| Keywords: | distinct-element method, parametric sensitivity analysis, intact rock, Voronoi tessellation, micromechanical properties, standard laboratory test |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Year of publishing: | 2015 |
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| Number of pages: | str. 5-23 |
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| Numbering: | Letn. 12, št. 2 |
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| PID: | 20.500.12556/DKUM-70849  |
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| ISSN: | 1854-0171 |
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| UDC: | 552.086 |
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| ISSN on article: | 1854-0171 |
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| COBISS.SI-ID: | 1253726 |
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| NUK URN: | URN:SI:UM:DK:VOFWH51S |
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| Copyright: | Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru |
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| Publication date in DKUM: | 15.06.2018 |
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| Views: | 1787 |
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| Downloads: | 141 |
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| Metadata: |    |
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| Categories: | Misc.
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