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

0447880 - ÚGN 2016 RIV CA eng J - Journal Article
Vavro, Martin - Souček, Kamil - Staš, Lubomír - Waclawik, Petr - Vavro, Leona - Koníček, Petr - Ptáček, Jiří
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.
Canadian Geotechnical Journal. Roč. 52, č. 10 (2015), s. 1466-1476. ISSN 0008-3674. E-ISSN 1208-6010.
[International Colloquium on Geomechanics and Geophysics /5./. Karolinka, 25.06.2014-27.06.2014]
R&D Projects: GA MŠMT ED2.1.00/03.0082; GA MŠMT(CZ) LO1406
Institutional support: RVO:68145535
Keywords : rock quality designation (RQD) index * geotechnical monitoring * borehole–wall imaging * structural mapping * rock mass fracturing
Subject RIV: DH - Mining, incl. Coal Mining
Impact factor: 1.877, year: 2015
http://www.nrcresearchpress.com/doi/pdf/10.1139/cgj-2014-0377

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.
Permanent Link: http://hdl.handle.net/11104/0249629