Poroelastic Coefficients for Siliceous Rocks Distributed in the Horonobe Area, Hokkaido, Japan

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  • MIYAZAWA Daisuke
    Sedimentary Rock Research Group, Horonobe Research Inst. for the Subsurface Environment, Northern Advancement Center for Science & Technology
  • SANADA Hiroyuki
    Sedimentary Environment Engineering Group, Horonobe Underground Research Unit, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • KIYAMA Tamotsu
    Horonobe Research Inst. for the Subsurface Environment, Northern Advancement Center for Science & Technology
  • SUGITA Yutaka
    Sedimentary Environment Engineering Group, Horonobe Underground Research Unit, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • SHIJIMA Yoji
    Horonobe Research Inst. for the Subsurface Environment, Northern Advancement Center for Science & Technology

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Other Title
  • 間隙水圧・変形連成問題への最近の取り組み　　幌延地域に分布する珪質岩を対象とした間隙弾性パラメータの取得と室内試験法の提案
  • 幌延地域に分布する珪質岩を対象とした間隙弾性パラメータの取得と室内試験法の提案
  • ホロノベ チイキ ニ ブンプ スル ケイシツガン オ タイショウ ト シタ カンゲキ ダンセイ パラメータ ノ シュトク ト シツナイ シケンホウ ノ テイアン

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Abstract

Measurements of poroelastic coefficients of Horonobe siliceous rock, which constitutes the strata of the JAEA underground research facility, has been conducted using servo-controlled triaxial testing apparatus. The rock specimens were prepared from the cores obtained from the boreholes which penetrate the Koetoi formation and Wakkanai formation. Depth of cores varies from 222 to 599m. Following are the main results:<BR>1) Triaxial testing method, by which the rock test piece is axially loaded under constrained circumferential strain condition, has been developed to determine the poroelastic coefficients. <BR>2) The values of the undrained bulk modulus Ku, which were determined by two different methods, one is direct measurement and another is indirect evaluation using several coefficients, coincides each other for the rock obtained from the Koetoi formation, indicating that the measuring system is reliable.<BR>3) The relationship between poroelastic coefficient and the depth from which the testing sample is obtained has been studied and the results indicate that, the ratio Ku/K varying from 4 to 15 is inversely proportional to the depth. Skempton's coefficient B slightly decreases with depth and Biot-Willis coefficient α exceeding 0.95 is not dependent to depth.<BR>4) Skempton's coefficient B slightly decreases with increase of the confining pressure. On the other hand, undrained bulk modulus Ku increases with confining pressure.<BR>5) Although the poloelasticity theory is well applicable to the rock of Koetoi formation, its applicability is problematic to the rock of Wakkanai formation.

Journal

  • Journal of MMIJ

    Journal of MMIJ 127 (3), 132-138, 2011

    The Mining and Materials Processing Institute of Japan

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