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Mechanical properties of basalt: a study on compressive loading at different strain rates using SHPB
Falta, J.; Krčmářová, N.; Fíla, T.; Vavro, Martin; Vavro, Leona
2023 - anglický
This article focuses on the mechanical properties of basalt in compressive loading at different strain-rates. The study employs advanced instrumentation for the evaluation of the results in dynamic conditions, while standard uni-axial loading device is used for evaluation in quasi-static conditions. Basalt specimens were subjected to four different loading-rates from 200–600 s−1 on which the stress-strain dependence was evaluated together with DIC analysis of crack initiation and disintegration process. Understanding the mechanical properties of basalt can provide insights for engineers and designers in creating structures that are durable and able to withstand different loading conditions. The findings of this study can have implications for a wide range of industries, including aerospace, automotive, and construction, among others.
Klíčová slova:
SHPB; basalt; compressive loading; dynamic loading
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Mechanical properties of basalt: a study on compressive loading at different strain rates using SHPB
This article focuses on the mechanical properties of basalt in compressive loading at different strain-rates. The study employs advanced instrumentation for the evaluation of the results in dynamic ...
Stress state rock mass monitoring ahead of longwall No. II/501/C, Mine Staszic-Wujek, PGG, Poland -Project RFCS DD-MET
Waclawik, Petr; Kukutsch, Radovan; Staš, Lubomír; Souček, Kamil; Vavro, Leona; Vavro, Martin; Kubina, Lukáš; Schuchová, Kristýna
2022 - anglický
For designing precisely the reinforcement of mine gate and reinforcing underground structures in general, knowing stress and deformation states in the rock massive in the immediate vicinity of these mine works as precisely as possible is absolutely decisive. In order to verify the rock mass stress state and its changes induced by longwall mining, the monitoring of rock mass stress changing in connection with the mine out of the coal seam No. 501, longwall face No. II/501/C in the Mine Staszic-Wujek, Poland, was suggested. The aim of the contractual research was the realisation and interpretation of the rock stress state monitoring using the CCBO (Compact Conical ended Borehole Overcoring method) and CCBM (Compact Conical ended Borehole Monitoring method) probes in the forefield of mentioned longwall face within geotechnical station. To verify stress monitoring, the survey of the state of the longwall gate was carried out using a pulse 3D scanner. The purpose was to capture deformation changes ahead of the advancing longwall face, specifically, at five stages in the ± 20 m section on each side from the installed geotechnical station.
Klíčová slova:
pre-mining stress; induced stress; 3D laser scanning
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Stress state rock mass monitoring ahead of longwall No. II/501/C, Mine Staszic-Wujek, PGG, Poland -Project RFCS DD-MET
For designing precisely the reinforcement of mine gate and reinforcing underground structures in general, knowing stress and deformation states in the rock massive in the immediate vicinity of these ...
Structural mapping of exploration geotechnical boreholes walls within 2nd phase – Decline
Waclawik, Petr; Schuchová, Kristýna; Kukutsch, Radovan; Georgiou, Lucie
2022 - anglický
Structural-geological analysis, i.e. fracturing assessment of the walls of geotechnical boreholes (CIS38 and CIS39) within the projected Decline in lithium exploratory area was carried out on the basis of optical (OPTV) and acoustic televiewer (HiRAT) records evaluation. HiRAT and OPTV probes are part of the Robertson Geologging logging equipment. The apparatus has an electric winch with a four core logging cable, which transmits the data recorded by the probes via a data logger to a computer. The spatial data obtained from interpretation of the geotechnical boreholes records were structurally analysed. The submitted research report comprehensively summarises the findings obtained from the structural mapping of geotechnical boreholes. On the basis measured data the rock mass quality evaluation of boreholes walls were additionally done. The complex data have been allowed very precise analysis of rock mass structural conditions, which are necessary for design of opening mine working.
Klíčová slova:
geotechnical boreholes; structural mapping; geotechnics
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
Structural mapping of exploration geotechnical boreholes walls within 2nd phase – Decline
Structural-geological analysis, i.e. fracturing assessment of the walls of geotechnical boreholes (CIS38 and CIS39) within the projected Decline in lithium exploratory area was carried out on the ...
Structural mapping of exploration geotechnical boreholes walls within 1st phase – Ore Zone
Waclawik, Petr; Vavro, Martin; Schuchová, Kristýna; Kukutsch, Radovan; Staš, Lubomír; Souček, Kamil; Georgiou, Lucie
2021 - anglický
Structural-geological analysis, i.e. fracturing assessment of the walls of geotechnical boreholes (CIS12, CIS14, CIS31 and CIS37) within the Ore Zone lithium exploratory area was carried out on the basis of optical (OPTV) and acoustic televiewer (HiRAT) records evaluation. HiRAT and OPTV probes are part of the Robertson Geologging logging equipment. The apparatus has an electric winch with a four-core logging cable, which transmits the data recorded by the probes via a data logger to a computer. The spatial data obtained from interpretation of the geotechnical boreholes records were structurally analysed. The submitted research report comprehensively summarises the findings obtained from the structural mapping of geotechnical boreholes. On the basis measured data the rock mass quality evaluation of boreholes walls were additionally done. The complex data have been allowed very precise analysis of rock mass structural conditions, which are necessary for construction geomechanical model.
Klíčová slova:
geotechnical boreholes; structural mapping; rock mass quality
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Structural mapping of exploration geotechnical boreholes walls within 1st phase – Ore Zone
Structural-geological analysis, i.e. fracturing assessment of the walls of geotechnical boreholes (CIS12, CIS14, CIS31 and CIS37) within the Ore Zone lithium exploratory area was carried out on the ...
RTIN-based strategies for local mesh refinement
Kolcun, Alexej; Sysala, Stanislav
2021 - anglický
Longest-edge bisection algorithms are often used for local mesh refinements within the finite element method in 2D. In this paper, we discuss and describe their conforming variant. A particular attention is devoted to the so-called Right-Triangulated Irregular Network (RTIN) based on isosceles right triangles and its tranformation to more general domains. We suggest to combine RTIN with a balanced quadrant tree (QuadTree) decomposition. This combination does not produce hanging nodes within the mesh refinements and could be extended to tetrahedral meshes in 3D.
Klíčová slova:
mesh refinement; longest-edge bisection; right-triangulated irregular network; balanced quadrant tree; homomorphic transformation
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
RTIN-based strategies for local mesh refinement
Longest-edge bisection algorithms are often used for local mesh refinements within the finite element method in 2D. In this paper, we discuss and describe their conforming variant. A particular ...
Resuscitation of landscape painting by research of landscape changes
Havlíček, M.; Slach, T.; Skokanová, H.; Halas, Petr; Kallabová, Eva; Koutecký, T.; Šebesta, J.
2021 - anglický
An analysis of selected landscape paintings shows that only a third of them are located directly on a hiking trail, bike path or nature trail. In the case of other landscape paintings, it is possible to make other, hitherto neglected parts of the territory more attractive to tourists by locating the places of the painter's shots, which may lead to their desired deconcentration from the places that are frequently visited by tourists.
Klíčová slova:
landscape painter; recreation; hiking trail
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
Resuscitation of landscape painting by research of landscape changes
An analysis of selected landscape paintings shows that only a third of them are located directly on a hiking trail, bike path or nature trail. In the case of other landscape paintings, it is possible ...
New opportunities for geotourism development at geoarcheological site Holedná Hill (Brno, Czech Republic)
Kubalíková, Lucie; Kirchner, Karel; Kuda, František
2021 - anglický
Special Interest Tourism is often seen as a form of ‘alternative’, ‘ethical’ or ‘environmentally responsible’ tourism and it occurs when the tourists’ motivation and decision-making are primarily determined by a particular special interest with a focus either on activities and/or destinations and settings and search for novel experiences (Novotná et al. 2019). \nOne of the types of sites are called geocultural sites (Reynard and Giusti 2018). Geoarcheological sites can be considered a type of geocultural sites and can be defined as sites where geological aspects are accompanied and closely related to archaeological issues. \nThe Holedná Hill (Brno, Czech Republic) can be considered an example of such geoarcheological site. It is important from the Earth-science point of view and it includes specific archaeological issues that are closely related to the geodiversity. This paper briefly sums the natural and cultural values of Holedná Hill and based on the geomorphosite assessment and SWOT analysis.\n
Klíčová slova:
geoheritage; cultural heritage; environmental education; geocultural site; recreation
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
New opportunities for geotourism development at geoarcheological site Holedná Hill (Brno, Czech Republic)
Special Interest Tourism is often seen as a form of ‘alternative’, ‘ethical’ or ‘environmentally responsible’ tourism and it occurs when the tourists’ motivation and decision-making are primarily ...
Anthropogenic relief transformations - their knowledge and evaluation with regard to the uniqueness and cultural identity of regions
Kirchner, Karel; Kubalíková, Lucie; Kuda, František; Havlíček, M.
2020 - anglický
Within the development of new regional geography, the role of human geographic research in the study of regions is emphasized. Regional uniqueness, a consciousness of belonging to a particular However, physical geography disciplines, e.g. geomorphology, can also contribute to the knowledge of these aspects with regard to the definition of regions. Currently, within the framework of geomorphology, attention is paid to the diversity of anthropogenic landforms. The knowledge and evaluation of these anthropogenic landforms, which are an important part of the historical elements of the landscape and are also referred to as cultural artefacts of the landscape, enables to supplement the cultural-historical values of the region and to specify the cultural identity of the region. On the example of sites - Staré Hradisko and Hostýn - we will present the specifics of secondary geodiversity with respect to the cultural identity of the sites.
Klíčová slova:
anthropogenic relief transformations; cultural heritage; region
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
Anthropogenic relief transformations - their knowledge and evaluation with regard to the uniqueness and cultural identity of regions
Within the development of new regional geography, the role of human geographic research in the study of regions is emphasized. Regional uniqueness, a consciousness of belonging to a particular ...
Geological paths – their use for the regional geography teaching
Kubalíková, Lucie; Drápela, E.; Bajer, A.; Zapletalová, D.; Balková, M.; Zágoršek, K.; Kirchner, Karel; Kuda, František; Roštínský, Pavel
2020 - anglický
Geological paths (geopaths, geotrails) represent a type of educational paths that connect sites, which are interesting from the Earth-sciences point of view. These sites (e.g. outcrops, old quarries, historical buildings built of local stone or viewpoints) often represent the links between geodiversity and other phenomena within a region (which is in accordance with a holistic approach to geotourism). Thus, they can give complex information not only about the abiotic nature but also about biodiversity, history or culture of the region, usually through narrative. Suitable interpretation of geodiversity and its relationships to the biodiversity and cultural heritage allows to identify regional specifics, it helps to find the mutual connections between particular phenomena within the region and it supports the holistic perception of a given region. The contribution presents an example from the Brno city where the urban geopath can be used for teaching regional geography of Brno and its surroundings.
Klíčová slova:
geodiversity; geotourism; geoheritage; cultural heritage; Brno
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
Geological paths – their use for the regional geography teaching
Geological paths (geopaths, geotrails) represent a type of educational paths that connect sites, which are interesting from the Earth-sciences point of view. These sites (e.g. outcrops, old quarries, ...
Developing urban geotourism in Brno (Czech Republic)
Kubalíková, Lucie; Kirchner, Karel; Bajer, A.; Balková, M.; Kuda, František
2020 - anglický
The term “urban geotourism” is defined as tourism based on the places within the city boundary (both in the form of built heritage - monuments, buildings, statues - and rock outcrops) that is related to geological concepts and features. As a first step for the development of urban geotourism it is necessary to identify and inventory the geotourist resources, which should take into account both natural (geological, geomorphological, hydrological or palaeontological, and ecological aspects related to geodiversity), and cultural aspects related to geodiversity (e.g. monuments, building stone, geo-toponyms, anthropogenic landforms). Based on the classification of geotourist sites, selected examples from Brno (Czech Republic) are given, supplemented by geotourist and geo-educational activities. In the conclusion, the advantages of urban geotourism are summarized and its importance for the protection of abiotic nature and sustainable management of valuable sites is suggested.\n\n
Klíčová slova:
geoheritage; cultural heritage; geoeducation; geocultural sites; geoarchaeological sites; anthropogenic landforms
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
Developing urban geotourism in Brno (Czech Republic)
The term “urban geotourism” is defined as tourism based on the places within the city boundary (both in the form of built heritage - monuments, buildings, statues - and rock outcrops) that is related ...
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