Analysis of stiffness for anisotropic rock masses by borehole jack test

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  • KAWAKUBO Shohei
    Technical Research Institute, HAZAMA ANDO CORPORATION
  • OHNO Hirokazu
    Horonobe Underground Research Center, Japan Atomic Energy Agency
  • MATSUI Hiroya
    Horonobe Underground Research Center, Japan Atomic Energy Agency
  • TOGASHI Yota
    Graduate School of Science and Engineering, Saitama University
  • TANI Kazuo
    Department of Marine Resources and Energy, Tokyo University of Marine Science and Technology
  • KATO Takeshi
    Hokkaido Branch, Kawasaki Geological Engineering Co., Ltd.

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Other Title
  • ボアホールジャッキ試験による異方性岩盤のヤング率解析法

Abstract

<p>Plate load test and pressuremeter test are common in-situ tests to evaluate the stiffness of rock masses. However, a method to evaluate the anisotropic nature of stiffness of rock masses has not been established yet. In this paper, a method is proposed to evaluate the Young’s modulus of anisotropic rock masses by borehole jack test. The theoretical analysis is based on an orthotropic elasticity and the displacements along the borehole wall are derived from the exact solution. In the latter half, back analysis method is shown and the relevant two Young’s moduli for the orthotropic rock masses are obtained using in-situ data to validate the proposed method.</p>

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