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Evaluation of Anisotropy of Fracture Toughness in Brittle Rock, Migmatized Gneiss
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SYSNO ASEP 0475816 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Evaluation of Anisotropy of Fracture Toughness in Brittle Rock, Migmatized Gneiss Author(s) Berčáková, Andrea (UGN-S)
Melichar, R. (CZ)
Obara, Y. (JP)
Ptáček, Jiří (UGN-S) RID
Souček, Kamil (UGN-S) RID, ORCIDNumber of authors 5 Source Title Procedia Engineering - ISRM European Rock Mechanics Symposium EUROCK 2017. - Amsterdam : Elsevier Ltd., 2017 / Koníček P. ; Souček K. ; Konečný P. - ISSN 1877-7058 Pages s. 900-907 Number of pages 8 s. Publication form Online - E Action ISRM European Rock Mechanics Symposium EUROCK 2017 Event date 20.06.2017 - 23.06.2017 VEvent location Ostrava Country CZ - Czech Republic Event type WRD Language eng - English Country NL - Netherlands Keywords strength anisotropy ; metamorphic foliation ; semi-circular bend test ; fracture toughness Subject RIV DH - Mining, incl. Coal Mining OECD category Environmental and geological engineering, geotechnics R&D Projects LO1406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED2.1.00/03.0082 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UGN-S - RVO:68145535 UT WOS 000416996000115 DOI 10.1016/j.proeng.2017.05.260 Annotation Most rocks in nature are affected by a certain degree of anisotropy. They contain cracks mostly with certain distributions. Therefore their mechanical behaviour is dependent on the direction of the strength distribution, which is different in each direction. We can distinguish the directions in which the rock is relatively firm and conversely the directions in which it is weak. The strength anisotropy and the direction of weakening is useful information for engineering applications. Metamorphic foliation with the specific orientation of rock grains also influences the mechanical behaviour, and the mechanical properties, i.e. strength, are changed in different directions of loading. This change of strength is called the strength anisotropy. The main purpose of this research is to analyze the effect of the orientation of metamorphic foliation distinguished within the rock specimens on their strength anisotropy. In the article, the anisotropy of a mechanical property, i.e. the fracture toughness, of migmatized gneiss is discussed. For this purpose, series of semi-circular bend tests were carried out on specimens of migmatized gneiss with a metamorphic foliation. The methodology used in this research is effective for evaluating the strength anisotropy of a brittle rock. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2018 Electronic address http://www.sciencedirect.com/science/article/pii/S1877705817324001
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