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Development of a three-dimensional grain-based combined finite-discrete element method to model the failure process of fine-grained sandstones

Citation

Yahaghi, J and Liu, H and Chan, A and Fukuda, D, Development of a three-dimensional grain-based combined finite-discrete element method to model the failure process of fine-grained sandstones, Computers and Geotechnics, 153 Article 105065. ISSN 0266-352X (2022) [Refereed Article]


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DOI: doi:10.1016/j.compgeo.2022.105065

Abstract

This paper introduces a novel three-dimensional grain-based hybrid finite-discrete element method parallelized based on general-purpose graphic processing units (GPGPUs) and applies it to investigate the failure process of sedimentary fine-grained sandstones. The grain-based method considers the actual microstructures of rocks with Voronoi or grain-growth tessellations to model their failures, including transgranular, intergranular and intragranular crack propagations. The novel semi-adaptive contact activation approach (semi-ACAA) proposed by the authors and the efficient tetrahedron-to-point (TtoP) contact interaction algorithm developed by HOSS are implemented to speed up grain-based modelling in addition to GPGPU parallelization. Semi-ACAA and TtoP are approximately 220 times and 1.5 times faster than the brute-force contact activation approach and tetrahedronto- triangle contact interaction algorithm, respectively, which are prevalent in the FDEM community. The grainbased modelling elucidates that most intragranular cracks are observed in the medium- and high-strength grains of the sandstones, while most intergranular cracks occur at the grain boundaries between low- and high-strength grains. The transgranular cracks do not discriminate any grains on their propagating paths but propagate and coalesce with intragranular and intergranular cracks, which results in the final failure of the sandstones.

Item Details

Item Type:Refereed Article
Keywords:grain-based modelling, 3D FDEM, rock failure process, transgranular crack, fine-grained sandstone
Research Division:Engineering
Research Group:Civil engineering
Research Field:Civil geotechnical engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Yahaghi, J (Mr Javad Yahaghi)
UTAS Author:Liu, H (Dr Hong Liu)
UTAS Author:Chan, A (Professor Andrew Chan)
UTAS Author:Fukuda, D (Dr Daisuke Fukuda)
ID Code:154617
Year Published:2022
Deposited By:Engineering
Deposited On:2022-12-15
Last Modified:2023-01-10
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