Application of a downward compact conical-ended borehole overcoring technique to orthotropic rock

K. Sakaguchi, J. Usami, K. Matsuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 conducted to confirm the applicability and efficiency of the proposed measurement theory. The results showed that the measurement includes a non-negligible error if we do not consider the anisotropy of rock when such anisotropy is strong. On the other hand, this measurement is both applicable and efficient if we consider the anisotropy of rock. Finally, laboratory experiments for four kinds of orthotropic rocks using a true-triaxial compressive apparatus were carried out to verify the efficiency of the proposed measurement theory. These experiments also verified that the proposed method is suitable for use in orthotropic rock.

Original languageEnglish
Title of host publicationRock Stress and Earthquakes - Proceedings of the 5th International Symposium on In-Situ Rock Stress
Pages111-117
Number of pages7
Publication statusPublished - 2010 Dec 1
Event5th International Symposium on In-Situ Rock Stress, ISRSV 2010 - Beijing, China
Duration: 2010 Aug 252010 Aug 27

Publication series

NameRock Stress and Earthquakes - Proceedings of the 5th International Symposium on In-Situ Rock Stress

Other

Other5th International Symposium on In-Situ Rock Stress, ISRSV 2010
CountryChina
CityBeijing
Period10/8/2510/8/27

ASJC Scopus subject areas

  • Geology
  • Geotechnical Engineering and Engineering Geology

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