Abstract
Granulite represents one of the favourite rock types for the construction of an underground nuclear waste repository in the Czech Republic. Granulite from the Bohemian Massif (locality Horni Bory) was investigated in this study, with a special focus on the evaluation of the rock anisotropy. Investigated rock represents typical fine-grained foliated felsic granulite with principal mineral association: quartz + feldspar (K-feldspar > plagioclase) + garnet + biotite + kyanite and/or sillimanite. Anisotropy was identified in the rock fabric both at macroscopic and microscopic scale. During the laboratory testing, granulite reached considerable high uniaxial compressive strength (UCS) - up to 240 MPa; and brittle type (Class II) of failure occurred. We found that variability of the UCS and Young's modulus were relatively low. On the other hand, variability of the Poisson's ratio and the constants in Hoek-Brown failure criterion in triaxial loading were significantly high. Keywords: granulite, mineral properties, foliation, uniaxial compressive strength, triaxial compressive strength, anisotropic properties DOI 10.35180/gse-2019-0022
Highlights
Granulite is light crystalline, highly compact rock with biotite-bearing bands and disseminated garnet
Highly compact rock with biotite-bearing bands and disseminated garnet. It was originally recognized from the area of Bohemian Massif by von Justi in 1754 [1] under the name "Namiester Stein" on its type locality – Lamberk near Náměšť nad Oslavou (Náměšť Granulite Massif) and 48 years later characterised under the name "Weisstein" from the Saxonian Granulite Massif (Sächsisches Granulitgebirge) as a light coloured rock with quartz + feldspar-dominated mineral assemblage [2] (Figure 1; Figure 2A, 2B)
The principal aim of our study is to provide combined petrographic and mechanical characteristics of granulite samples from the Horní Bory quarry located within the Bory Granulite
Summary
Highly compact rock with biotite-bearing bands and disseminated garnet. Granulites from the Bohemian Massif were more recently characterised in several papers [3, 4, 5, 6, 7] This high-pressure and rarely microdiamond-bearing rocks [8], which holds a potential to record conditions of their formation deep in the Earth's crust, were selected as one of the promising rocks type for the construction of the deep-seated nuclear waste repository in the Czech Republic [9, 10 and references therein]. Foliated structure of granulite as high-pressure metamorphic rock can appear This macroscopic structure of the rock indicates potential of anisotropy of mechanical properties. We can assume that granulite as member of this rock group can show a relatively low degree of anisotropy
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