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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

journal contribution
posted on 2023-05-21, 15:24 authored by Javad Yahaghi, Hongyuan LiuHongyuan Liu, Andrew ChanAndrew Chan, Fukuda, D
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 2–20 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.

Funding

CSIRO-Commonwealth Scientific & Industrial Research Organisation

History

Publication title

Computers and Geotechnics

Volume

153

Article number

105065

Number

105065

Pagination

1-20

ISSN

0266-352X

Department/School

School of Engineering

Publisher

Elsevier Sci Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Oxon, Ox5 1Gb

Rights statement

© 2022 Elsevier Ltd. All rights reserved.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in engineering

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