In-Situ Rock Stress Measurement using Improved Downward Compact Conical-Ended Borehole Overcoring Technique

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  • 下向き円錐孔底ひずみ法による原位置応力測定
  • シタムキ エンスイコウテイヒズミ ホウ ニ ヨル ゲン イチ オウリョク ソクテイ

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Abstract

In-situ stress measurement by means of the Downward Compact Conical-ended Borehole Overcoring (DCCBO) technique, which one of the overcoring method, was carried out at Kamaishi mine to aim at practical use of this technique. Prior to in-situ stress measurement, measuring apparatus (conical bit, strain cell insertion tool and data logging equipment built-in tilt-azimuth meter) for HQ-size borehole were developed by improving apparatus for PQ-size borehole. Then, the measurement method based on the determination of strain coefficients depending on the estimation of the elastic properties of the adhesive under in-situ measured temperature was proposed.<BR>Performing in-situ tests, we verified that improved measuring apparatus for HQ-size borehole works well in a water-filled vertical borehole. Moreover, it was confirmed that the proposed measurement method could estimate the in-situ stresses relatively consistent with those by other measurement method near this test site. It was concluded that in-situ stresses measured by the proposed measurement method have sufficient reliability.

Journal

  • Journal of MMIJ

    Journal of MMIJ 126 (7), 418-424, 2010

    The Mining and Materials Processing Institute of Japan

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