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Application of alternative methods for determination of rock quality designation (RQD) index: a case study from the Rožná I uranium mine, Strážek Moldanubicum, Bohemian Massif, Czech Republic
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SYSNO ASEP 0447880 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Application of alternative methods for determination of rock quality designation (RQD) index: a case study from the Rožná I uranium mine, Strážek Moldanubicum, Bohemian Massif, Czech Republic Author(s) Vavro, Martin (UGN-S) RID, ORCID
Souček, Kamil (UGN-S) RID, ORCID
Staš, Lubomír (UGN-S) RID, ORCID
Waclawik, Petr (UGN-S) RID
Vavro, Leona (UGN-S) RID
Koníček, Petr (UGN-S) RID, ORCID
Ptáček, Jiří (UGN-S) RIDNumber of authors 7 Source Title Canadian Geotechnical Journal - ISSN 0008-3674
Roč. 52, č. 10 (2015), s. 1466-1476Number of pages 11 s. Publication form Online - E Action International Colloquium on Geomechanics and Geophysics /5./ Event date 25.06.2014-27.06.2014 VEvent location Karolinka Country CZ - Czech Republic Event type WRD Language eng - English Country CA - Canada Keywords rock quality designation (RQD) index ; geotechnical monitoring ; borehole–wall imaging ; structural mapping ; rock mass fracturing Subject RIV DH - Mining, incl. Coal Mining R&D Projects ED2.1.00/03.0082 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LO1406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UGN-S - RVO:68145535 UT WOS 000363475700007 DOI 10.1139/cgj-2014-0377 Annotation A comparison of rock quality designation (RQD) parameters obtained by drill core analysis and the RQD determined using alternative methods is presented using metamorphic rocks such as migmatized gneisses, migmatites, and amphibolites. Methods of borehole–wall imaging using high-resolution acoustic logging, optical televiewer, and simple video inspection as well as the structural analysis of exploration drift walls oriented subparallel to the analysed boreholes are used for alternatively evaluated RQD values. Results show that, in most cases, the RQD index measured directly on a drill core section reaches lower values (about 10%–30%) than the RQD evaluated by alternative methods. Significant differences in determination of the rock mass failure degree using classical and alternative methods may occur, especially in sections with higher frequency of the metamorphic foliation planes created by biotite-rich bands or by dark-coloured melanosome layers. The nature of biotite itself is favourable for the creation of pre-disposed jointing planes, in which the increased drill core disintegration caused by drilling technology or core handling can occur. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2016 Electronic address http://www.nrcresearchpress.com/doi/pdf/10.1139/cgj-2014-0377
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