Development of downward compact conical-ended borehole overcoring technique for in situ rock stress determination in deep borehole and its application examples

Kiyotoshi Sakaguchi, H. Takeda, K. Matsuki, M. Minami, M. Hara, Y. Suzuki

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

1 Citation (Scopus)

Abstract

To determine the complete three-dimensional in situ stress in a deep borehole, the downward compact conical-ended borehole overcoring (DCCBO) technique, which is a type of stress-relief method, was developed. The DCCBO technique can be applied to a water-filled vertical/sub-vertical borehole. In a shallow in situ test at a gallery for an underground power station, a measuring system consisting of a bonding device, a system for cleaning the bottom of the borehole and a multi-channel data-logger were verified to work well in a water-filled borehole with cuttings at the bottom of the borehole. With regard to the direction of principal stress, reasonable results were obtained by an in situ test. Thus, we confirmed the practicality of this DCCBO technique.

Original languageEnglish
Title of host publicationProceedings of the International Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application
Pages87-93
Number of pages7
Publication statusPublished - 2006 Dec 1
EventInternational Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application - Trondheim, Norway
Duration: 2006 Jun 192006 Jun 21

Publication series

NameProceedings of the International Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application

Other

OtherInternational Symposium on In-situ Rock Stress - In-situ Rock Stress Measurement, Interpretation and Application
CountryNorway
CityTrondheim
Period06/6/1906/6/21

ASJC Scopus subject areas

  • Geophysics

Fingerprint Dive into the research topics of 'Development of downward compact conical-ended borehole overcoring technique for in situ rock stress determination in deep borehole and its application examples'. Together they form a unique fingerprint.

Cite this