Exploring the role of sample size on fracture growth mechanisms in intact rock: Insights from 3D DEM-DFN analysis

dc.affiliation.institutionShanghai Jiao Tong University
dc.affiliation.institutionMcGill University
dc.affiliation.institutionShanghai Jiao Tong University
dc.contributor.authorGao, Ge
dc.contributor.authorMeguid, M.A.
dc.contributor.authorZhang, Lulu
dc.date.accepted2024-11-11
dc.date.accessioned2025-02-03T19:00:21Z
dc.date.available2025-02-03T19:00:21Z
dc.date.issued2024-11-11
dc.date.revised2024-11-01
dc.date.submitted2023-12-11
dc.description.abstractThe effect of sample size on the deformation characteristic and fracture growth mechanism of intact rock subjected to unconfined compressive stress state is examined in this study via discrete element method coupled with discrete fracture network. Three-dimensional numerical models are first developed based on reported laboratory experiments and verified to realistically replicate the effect of sample size on the macro-mechanical response of the intact rock. This includes strength behavior, fracturing activities and energy budgets. Micromechanical analyses are then performed to understand the role of sample size on the deformational behavior and damage progression in intact rock. Emphasis is placed on the distributions of coordination number, evolutions of crack density and the degree of crack anisotropy with regard to invariants of crack tensors. Results reveal that deformability and strength of intact rock are vastly reliant on the sample size. Increasing sample size facilitate the accumulation of induced microcracks due to the increased probability of interparticle bond failure. It is found that the increase in sample size can result in more tensile openings with strong dilatancy. Finally, the monotonical increase in seismic b-values with the increase in sample size suggests an acceleration in the number of small-magnitude AE events.
dc.description.disclaimerThe presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author.
dc.identifier.doi10.1139/cgj-2023-0707
dc.identifier.issn0008-3674
dc.identifier.urihttps://hdl.handle.net/1807/141994
dc.publication.journalCanadian Geotechnical Journal
dc.publisherCanadian Science Publishing
dc.titleExploring the role of sample size on fracture growth mechanisms in intact rock: Insights from 3D DEM-DFN analysis
dc.typeResearch Article
dc.typeArticle Post-Print

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