A5022402224- Rock Mechanics and Modeling
- Drilling and Well Engineering
- Geotechnical and Geomechanical Engineering
- Geodetic Measurements and Engineering Structures
- Geomechanics and Mining Engineering
- Geological Formations and Processes Exploration
- Tunneling and Rock Mechanics
- Nuclear and radioactivity studies
- Geotechnical and Mining Engineering
- Landslides and related hazards
- Geological Modeling and Analysis
- Building materials and conservation
- Graphite, nuclear technology, radiation studies
- Geophysical Methods and Applications
- Engineering Structural Analysis Methods
- Grouting, Rheology, and Soil Mechanics
- Geology and Environmental Impact Studies
- Engineering Applied Research
- Polymer composites and self-healing
- Mineral Processing and Grinding
- Fatigue and fracture mechanics
- Hygrothermal properties of building materials
- Mining Techniques and Economics
- Advancements in Materials Engineering
- Belt Conveyor Systems Engineering
Czech Academy of Sciences, Institute of Geonics
2006-2023
Czech Academy of Sciences
2018
VSB - Technical University of Ostrava
2011
Preliminary notes
Abstract This paper describes the first experience in situ determination of stress tensor changes during a longwall extraction. A device designed to measure deformations at bottom conical ended boreholes was used for long term observation induced by underground mining activity.
This research project comprises stress monitoring, primarily of the changes induced by longwall mining or destress blasting, which was realized in a mine Ostrava-Karviná Coalfields (Upper Silesian Coal Basin). Verification field response to stresses different geological factors main aim project. Stress change monitoring region advanced carried out using seven probes. In all, boreholes were instrumented with compact conical ended borehole (CCBM) probes for continuous stress–strain due and...
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...
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,...
The strain gauge probes of different construction are typically used for determination stress state rock mass. modified overcoring method known as the Compact Conical ended Borehole Overcoring (CCBO) in mass was designed Institute Geonics CAS (IGN) cooperation with Kumamoto University Japan. implemented adjustment consists mainly omitting phase (stress relief phase). probe is glued directly to conically shaped end a borehole. data logger located within conical enables continual monitoring...
Abstract Three epoxy‐amine thermoset systems were cured at a low ambient temperature. Evolution of the reaction kinetics and molecular structure during cure sub‐glass transition temperature was followed by DSC chemorheology experiments. The effect vitrification exotherm on curing final mechanical properties epoxy thermosets determined. Thermomechanical low‐temperature depend volume mixture. Curing fast‐reacting system in large (12‐mm thick layer) resulted material with T g exceeding 70–80°C...
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...
Crystalline rocks are being considered as potential host for the construction of deep geological repositories (DGR) radioactive waste in a number European countries including Czech Republic. Advection is main process within such type test. Tracer tests, using various substances, used different purposes; however, they generally employed particularly characterisation flow systems. A system consisting field intersecting water bearing fracture was first identified at Josef Underground...
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...
Non-destructive investigation and analysis of inner structure rock samples by an X-ray CT is important instrument for better insight into properties materials related to the geometrical shape arrangement individual construction elements, spatial distribution pore space included. Study migration parameters transfer granitic from micro- scale real in massive required most detailed visualisation as possible selected which mostly formed micro-cracks thus can have crucial effect on transport...