花崗岩の圧縮強度と変形特性に及ぼすひずみ速度の影響 Effect of Strain Rate on Compressive Strength and Deformability of Granite

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著者

    • 林 為人 LIN Weiren
    • 産業技術総合研究所深部地質環境研究センター Research Center for Deep Geological Environments, National Institute of Advanced Industrial Science and Technology
    • 高橋 学 [他] TAKAHASHI Manabu
    • 産業技術総合研究所深部地質環境研究センター Research Center for Deep Geological Environments, National Institute of Advanced Industrial Science and Technology

抄録

Triaxial compression tests at 50 MPa confining pressure and room temperature have been conducted under various constant axial strain rates ranging between 10<sup>-7</sup> s<sup>-1</sup> and 10<sup>-3</sup> s<sup>-1</sup> by using dried specimens of Inada granite. The experimental results showed that the ultimate strength, axial strain at failure, Poisson's ratio and anelastic energy which may be considered as the energy required to generate new cracks or to propagate pre-existing cracks in the compression process, increased with increasing strain rate. In addition, Young's modulus and fracture angle which is the angle contained by fracture plane and lateral section of specimen, decreased with increasing strain rate.<BR>By comparing the strain rate dependence of the compressive strength and elastic constants of granites determined experimentally in the present study and the previous works, it can be decided that the strain rate dependence of the different rocks showed different features although the rocks were same granites in petrologic classification. First, the compressive strength increased linearly as the logarithm of the strain rate increase at intermediate strain rate range (considered as from 10<sup>-8</sup> s<sup>-1</sup> to 10<sup>-1</sup> s<sup>-1</sup>, approximately) in any granite. At high confining pressure, the strain rate dependence of the strength is enhanced in fine-grained granites; in contrast, the dependence is enfeebled in medium-grained granites. Secondly, the strain rate dependence of Young's modulus had more complex behaviors than that of the strength. At the intermediate strain rate range, there are three types of granites which were (1) their Young's modulus did not depend on the strain rate, (2) their modulus increased with the increase of the strain rate, and (3) their modulus decreased with the increase.

収録刊行物

  • 資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan

    資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 118(5), 377-384, 2002-06-25

    The Mining and Materials Processing Institute of Japan

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各種コード

  • NII論文ID(NAID)
    10008852196
  • NII書誌ID(NCID)
    AN10062646
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09161740
  • NDL 記事登録ID
    6191279
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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