Determination of an empirical relations between mode I fracture toughness using CB and SCB specimens and Brazilian tensile strength of rocks

0577557 - ÚGN 2024 RIV AT eng C - Conference Paper (international conference)
Vavro, Leona - Vavro, Martin - Kataoka, M.
Determination of an empirical relations between mode I fracture toughness using CB and SCB specimens and Brazilian tensile strength of rocks.
Proceedings of the ISRM 15th International Congress on Rock Mechanics and Rock Engineering & 72nd Geomechanics Colloquium – Challenges in Rock Mechanics and Rock Engineering. Salzburg: Austrian Society for Geomechanics, 2023 - (Schubert, W.; Kluckner, A.), s. 2430-2435. ISBN 978-3-9503898-3-8.
[ISRM International Congress on Rock Mechanics and Rock Engineering /15./ & Geomechanics Colloquium /72./ – Challenges in Rock Mechanics and Rock Engineering. Salzburg (AT), 09.10.2023-14.10.2023]
R&D Projects: GA ČR(CZ) GA23-05128S
Institutional support: RVO:68145535
Keywords : rock * mode I fracture toughness * CB specimen * SCB specimen * Brazilian tensile strength
OECD category: Environmental and geological engineering, geotechnics

Fracture toughness (FT) expresses material resistance to crack propagation leading to its final macroscopic failure. Approximately 20 different laboratory methods are currently used for a mode I and mixed mode I/II FT rock testing. However, it is a well-known fact that, for the same rock, the mode I FT value varies when different specimen types are utilized. Moreover, the preparation of specimens for FT testing may be associated with difficulties in obtaining required notch dimensions. From this point of view, Brazilian tensile strength (BTS) represents an easily and quickly detectable parameter that can be applied for prediction of the mode I FT. In this contribution, the results of investigations of mutual empirical relationships between FT determined using CB and SCB tests, as well as among FT values obtained via these testing methods and BTS are presented. A total of 14 different rock types, mostly sandstones, were used for this research.

Permanent Link: https://hdl.handle.net/11104/0346673