A5072759561- Rock Mechanics and Modeling
- Geological Formations and Processes Exploration
- Concrete and Cement Materials Research
- Recycling and utilization of industrial and municipal waste in materials production
- Drilling and Well Engineering
- Building materials and conservation
- Geophysical Methods and Applications
- Geodetic Measurements and Engineering Structures
- Tunneling and Rock Mechanics
- Seismic Imaging and Inversion Techniques
- Innovative concrete reinforcement materials
- Image Processing and 3D Reconstruction
- Grouting, Rheology, and Soil Mechanics
- Hygrothermal properties of building materials
- High-Velocity Impact and Material Behavior
- Geotechnical and Geomechanical Engineering
- Geochemistry and Geologic Mapping
- Magnesium Oxide Properties and Applications
- Education, Psychology, and Social Research
- Structural Engineering and Materials Analysis
- Geological Modeling and Analysis
- Engineering Structural Analysis Methods
- Mining and Gasification Technologies
- Marine and fisheries research
- Archaeology and Rock Art Studies
Czech Academy of Sciences, Institute of Geonics
2015-2024
VSB - Technical University of Ostrava
2008-2010
The article deals with the use of computed X-ray radiography to visualize development fracture process zone in rock samples. For radiographic observations during three-point bending loading, glauconitic sandstone from Řeka quarry (sometimes also referred as Godula sandstone) was used. chevron-notched cylindrical specimens diameter 29 mm and 120 nominal length were prepared blocks. These subjected Chevron Bend (CB) test carried out accordance ISRM suggested methodology; span 94 mm. evolution...
Accurate knowledge of the stress-strain state rock mass, not only in their vicinity but also wide surroundings mine workings, is absolutely critical for precise support designing. Investigation stress usually carried out by interpretation mass deformation processes, which can be relatively precisely observed and measured. In order to verify changes it induced longwall mining, monitoring connection with No. 371 202 was out. The seam extracted monitored has a thickness approximately 2 m at...
Several methods, including X-ray radiography, have been developed for the investigation of characteristics water-saturated quasi-brittle materials. Here, water content is one most important factors influencing their strength and fracture properties, in particular, as regards to porous building However, research concentrated on three-dimensional propagation still significantly limited due problems encountered with instrumentation requirements size effect. In this paper, we study influence a...
It is well known that the measured values of fracture toughness rocks are influenced by material heterogeneity, dimensions, boundary conditions, and asymmetric mechanical behavior. Consequently, results obtained standard testing methods developed primarily for homogenous materials with symmetric behavior, can significantly differ. The take global approach. Thus, they suppose tested will follow a specific physical model one consider selected method as black box in which some simple...
A comparison of rock quality designation (RQD) parameters obtained by drill core analysis and the RQD determined using alternative methods is presented metamorphic rocks such as migmatized gneisses, migmatites, amphibolites. Methods borehole–wall imaging high-resolution acoustic logging, optical televiewer, simple video inspection well structural exploration drift walls oriented subparallel to analysed boreholes are used for alternatively evaluated values. Results show that, in most cases,...
Bukov Underground Research Facility (Bukov URF) is designed to operate as a test site assess the properties and behavior of rock mass analogous selected seven candidate sites in Czech Republic. It situated at depth about 600 m beneath Earth's surface, which corresponds with proposed storage final locality for national deep repository high-level radioactive waste. URF, construction has started 2013, southern part Rožná uranium deposit, 40 km NNW from Brno. The composed relatively monotonous...
Slate is a traditional stone product that has long been used for roofing widely around the world. The presence of iron sulphides one most significant factors affecting slate resistance to weathering and, therefore, quality slates and their use in construction. Iron sulphide oxidation main process degradation. Qualitative quantitative analyses determine are usually conducted using transmitted reflected light microscopy, X-ray diffraction techniques. However, this paper presents computed...
This paper describes the petrological characteristics of biotite granodiorites from Litice nad Orlici Quarry in East Bohemia (Czech Republic). Physical, chemical and mechanical parameters extracted rocks crushed aggregates are presented, together with results a study rock fabric influence on shape aggregate grains as principal component high-performance high-strength concretes.
This paper concerns the results of research into influence composition rock inclusions on fracture response cement-based composite specimens. Specially designed specimens nominal dimensions 40 × 160 mm with in shape prisms 8 were provided an initial central edge notch a depth 12 mm. These specimens, which made fine-grained different types inclusion – amphibolite, basalt, granite, and marble tested three-point bending configuration. Fracture surfaces examined via scanning electron microscopy...
High-resolution time-lapse micro-focus X-ray computed tomography is an effective method for investigation of deformation processes on volumetric basis including fracture propagation characteristics non-homogeneous materials subjected to mechanical loading. This experimental requires implementation specifically designed loading devices imaging setups. In case bending tests, our background research showed that no commercial solution allowing reliable so called process zone in quasi-brittle...
It is well known that detailed investigation of fracture mechanics the quasi-brittle materials rather complicated task as standard loading devices do not allow to interrupt test after reaching maximal force. The reason point force followed by evolution processes, due elastic energy stored in device itself. This fundamental obstacle was overcome this work thanks a newly developed compact four-point bending device. We show shape crack can be evaluated on basis so called differential...
The paper is focused on the advanced evaluation of fracture tests selected rock specimens. Assessment response chevron notch cylindrical specimens Silesian granite subjected to three-point bending test was performed. effective crack model used and academic software chevroncylinder (author Petr Frantík) based finite element method applied for analyses. Based described procedures, estimation maximum values toughness are established discussed.
We’ve built this digital research platform to provide academics everywhere with fast, stable and secure access our library of over 110,000 scholarly books 800,000 journal articles. tested the in close cooperation leading academic institutions. If you have any questions or notice something doesn’t quite work as it should, please visit <a href="/publishing/faq?lang=en" class="text-primary">Help/FAQ</a> page let us know.
Roofing slate is a traditional natural material for roofing and other construction applications in various types of buildings. The paper deals with both methods mineralogical-petrographic analysis as well completely new (X-ray CT) rendering fast reliable determination qualitative parameters potential durability building constructions. A mutual combination the represents rapid, effective modern alternative to lengthy laboratory tests determine physical-mechanical properties newly used...