Effect of element configuration on Brazilian tensile failure by DEM

S. Nakashima, K. Taguchi, N. Shimizu, T. Funatsu

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    1 被引用数 (Scopus)

    抄録

    The Particle Flow Code (PFC), a numerical simulation code based on the distinct element method, is a useful tool for simulating the failure behavior of hard rocks. The introduction of clump logic (Cho et al., 2007) into the PFC modeling has made it possible for us to better reproduce the brittleness characteristic of hard rocks, namely, the large difference between compressive strength and tensile strength. However, there is a problem in the PFC simulation with the clumped particle model, namely, when we simulate Brazilian tensile tests on hard rocks, the results do not fully express the rapid decrease in tensile stress after the peak stress. One reason for this problem is the existence of clumps that block the rapid propagation and the connection of the micro-cracks in the model by their interlocking effect. Focusing on the effect of clump configuration on the Brazilian tensile failure behavior of hard rocks, this paper carried out simulations by varying clump size and ball size. The experimental mechanical properties of Lac du Bonnet granite (Potyondy and Cundall, 2004) were targeted in the simulations. From the simulation results, we confirmed that brittleness can be controlled by changing the ratio of clump size to minimum ball size and that under a constant ratio of clump size to minimum ball size, the local peak stress does not change with the minimum ball size.

    本文言語英語
    ホスト出版物のタイトルISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
    編集者 Kaneko, Kodama, Shimizu
    出版社International Society for Rock Mechanics
    ページ582-590
    ページ数9
    ISBN(電子版)9784907430030
    出版ステータス出版済み - 1 1 2014
    イベント8th Asian Rock Mechanics Symposium, ARMS 2014 - Sapporo, 日本
    継続期間: 10 14 201410 16 2014

    出版物シリーズ

    名前ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014

    その他

    その他8th Asian Rock Mechanics Symposium, ARMS 2014
    Country日本
    CitySapporo
    Period10/14/1410/16/14

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Geochemistry and Petrology

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