Long-term experience with stress state determination using CCBO probe in various rock mass

0519208 - ÚGN 2020 RIV NL eng C - Conference Paper (international conference)
Waclawik, Petr - Staš, Lubomír - Souček, Kamil - Vavro, Martin - Zajícová, Vendula
Long-term experience with stress state determination using CCBO probe in various rock mass.
Rock Mechanics for Natural Resources and Infrastructure Development - Full Papers. Vol. 6. Leiden: CRC Press/Balkema, 2019 - (da Fontoura, S.; Rocca, R.; Pavón Mendoza, J.), s. 1747-1754. ISBN 978-0-367-42284-4. ISSN 2639-7749. E-ISSN 2639-7757.
[International Congress on Rock Mechanics and Rock Engineering (ISRM 2019) /14./. Foz do Iguassu (BR), 13.09.2019-18.09.2019]
R&D Projects: GA MPO FV20294
Institutional support: RVO:68145535
Keywords : overcoring * CCBO * anisotropy
OECD category: Mechanical engineering

The strain gauge probes of different construction are typically used for determination of stress state of rock mass. The modified overcoring method with the original name Compact Conical ended Borehole Overcoring method (CCBO) for rock mass stress measurement is now commonly used. A conical probe was designed by the Institute of Geonics of the Czech Academy of Sciences (IGN) in cooperation with Kumamoto University in Japan. Many stress measurements using the CCBO probes were carried out in the recent past. These measurements were performed in varied rock mass adjacent to mine excavations. As demonstrated in the particular measurements present in this paper, the deformation responses of rock core can vary in sedimentary, metamorphic or igneous rocks. Some overcoring stress measurements provided implausible data due to high grade rock mass anisotropy. Influence of rock mass properties on evaluation presented in this paper is the main goal of this study.
Permanent Link: http://hdl.handle.net/11104/0304228