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Brno
Geotechnical Characterization of Bukov Underground Research Facility
Soucek, Kamil (Institute of Geonics of the CAS) | Vavro, Martin (Institute of Geonics of the CAS) | Stas, Lubomír (Institute of Geonics of the CAS) | Vavro, Leona (Institute of Geonics of the CAS) | Waclawik, Petr (Institute of Geonics of the CAS) | Konicek, Petr (Institute of Geonics of the CAS) | Ptácek, Jirí (Institute of Geonics of the CAS) | Vondrovic, Lukás (Radioactive Waste Repository Authority (RAWRA))
Abstract Bukov Underground Research Facility (Bukov URF) is designed to operate as a test site to assess the properties and behavior of the rock mass analogous to selected seven candidate sites in the Czech Republic. It is situated at a depth of about 600 m beneath Earth's surface, which corresponds with the proposed storage depth of the final locality for the national deep repository of high-level radioactive waste. Bukov URF, the construction of which has started in 2013, is situated in the southern part of the Rožná uranium deposit, about 40 km NNW from Brno. The rock mass is composed of relatively monotonous rock sequences mainly represented by migmatized biotite paragneisses up to stromatic migmatites, amphibole-biotite to biotite-amphibole gneisses, and amphibolites. Based on the analysis of physical and mechanical properties, intact rocks in the studied area exhibit a high to very high strength and may be only locally affected by metasomatic alterations. The research activities focus on a complex geological and geotechnical characterization of the rock mass of interest, which is necessary for further in situ research. This paper briefly describes the main results of the current stage of geotechnical exploration and research works made there by the Institute of Geonics of the CAS. These works especially include: determination and evaluation of physical and mechanical properties of the rocks taken from the drift walls and from the boreholes during driving, calculation of rock mass quality based on selected index rock mass classification systems, determination of stress and strain state of the rock mass using the methods of hydrofracturing, Goodman Jack, strain gauge probe measurements, long-term periodical tensometric and convergence measurements, and evaluation of the effects of technical and mining-induced seismicity on the rock mass of interest. 1. Introduction The disposal of spent nuclear fuel from operation of power generation and research reactors, and waste produced after its reprocessing, in deep geological repositories (DGRs) is considered, not only in Europe but also in other developed parts of the world (the USA, Canada, Japan, South Korea, Russia) to be by far the safest way of rendering such waste harmless. To check the properties of the host rock environment and to carry out a large number of research activities linked with the future DGRs, underground research laboratories (URL) are gradually being built in many countries around the world since the early 1980s. These URL are mainly situated either in crystalline rocks (e.g. AECL URL in Canada, Äspö Hard Rock Laboratory in Sweden, ONKALO underground research facility in Finland or Grimsel Test Site in Switzerland) or in clayey sediments, such as HADES URL in Belgium, Mont Terri URL in Switzerland, and Bure URL in France.
access gallery bz-xiij, amphibolite, bukov underground research facility, bukov urf, evaluation, geotechnical characterization, gneiss, kamil souček, mechanical properties, metals & mining, orientation, procedia engineering 191, repository, Reservoir Characterization, reservoir geomechanics, rock mass, structural geology, strážek moldanubicum, Upstream Oil & Gas
Industry:
- Water & Waste Management > Solid Waste Management (1.00)
- Materials (1.00)
- Energy > Power Industry > Utilities > Nuclear (1.00)
- Energy > Oil & Gas > Upstream (1.00)
SPE Disciplines:
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.88)
- Health, Safety, Environment & Sustainability > Environment > Naturally occurring radioactive materials (0.70)
INTRODUCTION Within the scope of the engineering geological evaluation of the area for the water- supply gallery line for the city of Brno geophysical methods were employed to verify weak zones. GEOLOGY The line of the water-supply gallery is 15 km long and is designed to be situated at the depth of approximately 100 m in the metamorphic rocks that belong to the Moravian- Silesian crystalline part of the Bohemian Massif in the central part of Moravia - Fig. 1. The tectonic pattern of the whole area is very complicated. Although for some mineral accumulations of Ag-Pb-Zn and Cu ores it has attracted attention since as early as the Middle Ages, the problems of its origin and structure have not yet been reliably solved. For this reason only general geological maps at the scales of 1: 50 000 and 1: 25 000 were available. These maps do not contain complete data concerning the tectonic structure of the region or of the weak zonesand offered a survey of the fundamental rock types only (Frejvald 1965, MÍsaŕ 1969). Therefore, the engineering geological mapping was carried out once again over the entire line of 15 km in a 500 m wide strip. The principle of the area convenience classification from the point of view of driving the gallery, i.e. the excavationVariscian syenite pre-Cambrian granodiorite and diorite orthogneiss paragneiss and m'gmatite two-mica schists green schists the border between metamorphic zones the border between regional units faults of rocks were observed. The tectonic analysis was performed as a part of the geological mapping. The information obtained from the confrontation of ore veins in abandoned old mines has also been used as well as the river course morphology. (Figure in full paper) (Figure in full paper) Two-mica orthogneiss is present in the largest part of the area of our interest. Its texture is granolepidoblastic, the structure is parallel. It consists of quartz, plagioclase albite, orthoclase or microcline, biotite and muscovite. Two-mica schist is the second most frequent rock type. It exhibits the lepidoblastic texture. Its schistosity is very intensive intensive. It consists of quartz, muscovite, biotite, orthoclase, plagioclase, chloritized garnet, apatite and zircon being accessory minerals. Gneissose granite with garnet occurs at the contact of orthogneiss with mica schists. They are of the granolepidoblastic texture or even of the porphyroblastic one. Amphibolites represent another rock type. They are greenish-black, of the granonematoblastic texture and parallel structure. They consist of common amphibole, which sometimes encompasses andesine. Biotite and garnet are less frequent. Ore minerals are represented by magnetite and pyrrhotine. The regional metamorphosis of these rock formations is pre-Devonian and it may correspond to the so called paleo- Moravian phase. The Variscian metamor phosis is periplutonic, retrograde, responsible for the origin of weak zones. The tectonic faulting has manifested itself as a multiple repetition of the lenticular structure of crystalline limestones along strike faults.
amphibolite, Czechoslovakia, engineering-geological characteristic, fracture characterization, geophysical method, investigation, metamorphic rock, mineral, orthogneiss, quartz, Reservoir Characterization, resistivity, rock massif, schist, symmetrical resistivity, tectonic clay, tectonic contact, Upstream Oil & Gas, vlf method, weak zone
Country:
- Europe > Czechia > South Moravian Region > Brno (0.25)
- Europe > Norway > Norwegian Sea (0.24)
SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.71)
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