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Relation between crack geometrical parameters, fracture toughness and rock microstructure investigated using X-ray computed tomography
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SYSNO ASEP 0597605 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Relation between crack geometrical parameters, fracture toughness and rock microstructure investigated using X-ray computed tomography Author(s) Vavro, Leona (UGN-S) RID
Vavro, Martin (UGN-S) RID, ORCID
Souček, Kamil (UGN-S) RID, ORCID
Řimnáčová, Daniela (USMH-B) ORCID, SAINumber of authors 4 Source Title Proceedings of the ISRM European Rock Mechanics Symposium EUROCK 2024, New Challenges in Rock Mechanics and Rock Engineering. - Alicante : CRC Press, 2024 / Tomás R. ; Cano M. ; Riquelme A. ; Pastor J. L. ; Benavente D. ; Ordónez S. - ISBN 978-103255144-9 Pages s. 1409-1415 Number of pages 6 s. Publication form Online - E Action ISRM European Rock Mechanics Symposium, EUROCK 2024 Event date 15.07.2024 - 19.07.2024 VEvent location Alicante Country ES - Spain Event type WRD Language eng - English Country ES - Spain Keywords crack geometry ; fracture toughness ; rock microstructure ; rock porosity Subject RIV DH - Mining, incl. Coal Mining OECD category Environmental and geological engineering, geotechnics Subject RIV - cooperation Institute of Rock Structure and Mechanics - Mining, incl. Coal Mining R&D Projects GA23-05128S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UGN-S - RVO:68145535 ; USMH-B - RVO:67985891 UT WOS 001310272000216 EID SCOPUS 85200398321 DOI https://doi.org/10.1201/9781003429234-216 Annotation In this contribution, the initial results of the study of the influence of rock microstructure and composition on the fracture toughness (FT) of rocks measured by the chevron bend (CB) test and subsequent analysis of cracks geometry using X-ray computed tomography (XCT) are presented. A total of 10 different types of rocks, mostly sandstones, were used for this testing. On the basis of laboratory experiments, the following conclusions can be made: (1) the value of crack length generally increases with decreasing rock porosity, (2) the value of crack length generally increases with increasing value of fracture toughness, (3) the value of the crack length of sandstones increases with a growing degree rock matrix silicification, (4) in porous rocks like sandstones, the crack propagation goes preferably throughout the pore space, and (5) in low-porosity crystalline igneous and metamorphic rocks, the cracks spread along grain bound-
aries and often also break mineral grains.Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2025
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