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Keywords: compact conical-ended borehole
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Proceedings Papers
Toshinori Nayuki, Tatsuya Tanaka, Kenichi Ando, Koji Oka, Naoki Nishizaka, Yuichiro Shimoguchi, Hiroshi Ogawa, Kazu Saito, Kiyotoshi Sakaguchi, Masaharu ltamoto
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-056
... can vary widely. Validation and engineering judgement with respect to the measured results is therefore necessary. This study focusses on the Compact Conical-ended Borehole Overcoring (CCBO) technique (Sakaguchi at al., 1994, 1995 and 1999), which is a stress relief method. With the CCBO technique...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, May 10–12, 2016
Paper Number: ISRM-ISRS-2016-048
... Abstract In-situ rock stress measurement was carried out in the Kamaishi mine of lwate prefecture to quantify the variation of the shallow crustal stress field associated with the 2011 Tohoku-oki earthquake. Stress measurement was conducted by the Compact Conical-ended Borehole Overcoring...
Proceedings Papers
Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-014
... ABSTRACT: The Downward Compact Conical-ended Borehole Overcoring (DCCBO) technique is one of the overcoring methods. In this study, a measurement theory for application of the DCCBO technique to orthotropic rock is proposed. Numerical experiments with the use of a 3D-FEM analysis were...
