Diametrical Core Deformation Analysis (DCDA) Developed for In-situ Rock Stress Measurements

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  • 岩盤応力評価のためのコア変形法(DCDA)
  • ガンバン オウリョク ヒョウカ ノ タメ ノ コア ヘンケイホウ(DCDA)

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Abstract

DCDA is a new method for evaluating the in-situ stress of rocks based on the elliptical deformation of boring cores with stress relief. When a rock core sample is carved out by drilling, it becomes free from in-situ stress, and the expansion should occur elastically. If the condition of in-situ stress is anisotropic, the core must deform in an asymmetric manner. With the precise measurement of core diameters in each directions, the deviatoric stress SHmax <tt>－</tt>Shmin and azimuths of SHmax and Shmin could be determined from the circumferential variation of the measured diameter. In order to confirm the reliability of DCDA, laboratory verifications were conducted. The estimated stresses by DCDA agreed well with the applied stresses, and the directions of dmax coincide to the directions of the applied stresses. From these results, the effectiveness of DCDA was confirmed.

Journal

  • Journal of MMIJ

    Journal of MMIJ 129 (8_9), 577-584, 2013

    The Mining and Materials Processing Institute of Japan

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