guest ::
| Home > Conference materials > Papers > Effect of tangent and secant elastic constants on CCBO stress evaluation in transversely isotropic rock |
Original title:
Effect of tangent and secant elastic constants on CCBO stress evaluation in transversely isotropic rock
Authors: Petrlíková, Alice ; Staš, Lubomír ; Kolcun, Alexej ; Kajzar, Vlastimil ; Koníček, Petr ; Souček, Kamil
Document type: Papers
Conference/Event: Conference Foundation Engineering Brno 2023 and 2024 /51. and 52./, Brno (CZ), 20251111
Year: 2026
Language: eng
Abstract: The Compact Conical Borehole Over-coring (CCBO) method is employed for the determination of the three-dimensional stress state in rock environments. The method utilises a strain gauge cell to quantify the deformation of over-cored rock, the deformation characteristics of which are evaluated in the laboratory. It is assumed that the in situ rock material is homogeneous, elastic and transversely isotropic and it is, therefore, imperative to ascertain the deformation parameters of the transversely isotropic material present in situ. The tangent and secant deformation parameters were taken from previous research and then employed throughout the stress determination process. This paper outlines the fundamental principles of the method and presents results from practical measurements carried out at the Grimsel Underground Research Laboratory in Switzerland. The stress results vary depending on whether alternative deformation characteristics (i.e. tangent or secant) are taken into account during the evaluation process.
Keywords: 3D stress state; CCBO method; determination of stress; in situ stress; over-coring method; stress state in rock mass; transversely isotropic rock
Project no.: EH23_020/0008487
Funding provider: GA MŠk
Host item entry: Acta Polytechnica CTU Proceedings, ISBN 978-80-01-07529-6
Note: Související webová stránka: https://ojs.cvut.cz/ojs/index.php/APP/article/view/11234
Institution: Institute of Geonics AS ČR (web)
Document availability information: Fulltext is available in the digital repository of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0377029
Permalink: http://www.nusl.cz/ntk/nusl-697191
The record appears in these collections:
Research > Institutes ASCR > Institute of Geonics
Conference materials > Papers
Authors: Petrlíková, Alice ; Staš, Lubomír ; Kolcun, Alexej ; Kajzar, Vlastimil ; Koníček, Petr ; Souček, Kamil
Document type: Papers
Conference/Event: Conference Foundation Engineering Brno 2023 and 2024 /51. and 52./, Brno (CZ), 20251111
Year: 2026
Language: eng
Abstract: The Compact Conical Borehole Over-coring (CCBO) method is employed for the determination of the three-dimensional stress state in rock environments. The method utilises a strain gauge cell to quantify the deformation of over-cored rock, the deformation characteristics of which are evaluated in the laboratory. It is assumed that the in situ rock material is homogeneous, elastic and transversely isotropic and it is, therefore, imperative to ascertain the deformation parameters of the transversely isotropic material present in situ. The tangent and secant deformation parameters were taken from previous research and then employed throughout the stress determination process. This paper outlines the fundamental principles of the method and presents results from practical measurements carried out at the Grimsel Underground Research Laboratory in Switzerland. The stress results vary depending on whether alternative deformation characteristics (i.e. tangent or secant) are taken into account during the evaluation process.
Keywords: 3D stress state; CCBO method; determination of stress; in situ stress; over-coring method; stress state in rock mass; transversely isotropic rock
Project no.: EH23_020/0008487
Funding provider: GA MŠk
Host item entry: Acta Polytechnica CTU Proceedings, ISBN 978-80-01-07529-6
Note: Související webová stránka: https://ojs.cvut.cz/ojs/index.php/APP/article/view/11234
Institution: Institute of Geonics AS ČR (web)
Document availability information: Fulltext is available in the digital repository of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0377029
Permalink: http://www.nusl.cz/ntk/nusl-697191
The record appears in these collections:
Research > Institutes ASCR > Institute of Geonics
Conference materials > Papers
Record created 2026-03-22, last modified 2026-03-22