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Research of geotechnical methods – Stage research report – Stage C
Staš, Lubomír ; Waclawik, Petr ; Souček, Kamil ; Vavro, Martin ; Kukutsch, Radovan ; Schuchová, Kristýna ; Gong, Libin ; Kubina, Lukáš ; Zajícová, Vendula ; Nohejl, Zdeněk ; Rutar, Tomáš
The main goal of project No. FV20294 (GEOSTAB) was the verification of measured geophysical quantities with data obtained by various geotechnical methods. For this reason, stage C - Research of geotechnical methods was solved in parallel and in close cooperation with stage B - Research of geophysical methods. The geotechnical experiments in situ were carried out in the same localities where geophysical methods were applied. For this purpose, several underground mining workings located in different lithological and geomechanical conditions were selected. Experimental gallery Josef was selected in volcanic rocks, the metamorphic rock mass was represented by underground workings of the former deep uranium mine Rožná and the sedimentary environment was examined in the old slate mine Modrá štola. The stage research report summarizes the results of geotechnical, laboratory and numerical methods from all the mentioned localities.
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3D laser scanning of underground workings in various conditions
Staš, Lubomír ; Kukutsch, Radovan ; Waclawik, Petr ; Gong, Libin ; Schuchová, Kristýna
3D laser scanning of mining workings were implemented at three locations with different conditions. The roadways in volcanic rocks at a depth ca 50 m below the surface at the Experimental gallery Josef, selected part of the Z3-XX roadway located in a metamorphic rock mass at a depth about 950 m below the surface at the Rožná mine and the closed slate mine Modrá štola in sedimentary rock mass located just below the surface, were scanned and interpreted in detail. 3D scans of mining workings were mainly used as input data to the GENIE software for processing geophysical measurements in the 3D dimension. This software tool was developed by the staff of the Technical University of Liberec and Geotest a.s.
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Determination of rock mass failure using acoustic and optical television - metamorphic rocks, Rožná Mine
Staš, Lubomír ; Waclawik, Petr ; Souček, Kamil ; Vavro, Martin ; Kukutsch, Radovan ; Rutar, Tomáš ; Nohejl, Zdeněk
In order to evaluate the geological structures on the core boreholes walls, using optical and acoustic logging methods (OBI and ABI) the boreholes were logged at the Rožná Mine. Oriented recording of the walls was performed using optical television (OPTV - Optical TeleViewer) in the horizontal borehole (VRT-H). The optical recording was supplemented by the acoustic television record (HiRAT - High Resolution Acoustic Televiewer) in the down borehole (VRT-U). The measured oriented records by OBI and ABI methods were processed and evaluated in WellCAD software for logging data processing. Based on the evaluated structural data, a structural cross-section was constructed, which was the background material for correlation with geophysical data.
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Assessment of primary rock mass stress by overcoring method using CCBO probes, Mine Rožná
Staš, Lubomír ; Waclawik, Petr ; Souček, Kamil ; Vavro, Martin ; Kukutsch, Radovan ; Nohejl, Zdeněk ; Rutar, Tomáš
The measurement of the stress state of the rock mass was performed on the 20th level of the liquidated uranium mine Rožná. This site was selected as one of the possible test sites of the planned geotechnical and geophysical methods. As part of the measurements, a series of four measurements of the 3D stress tensor were carried out within the sub-horizontal (approx. + 5 °) borehole with a diameter of 76 mm. To measure the primary stress of the rock mass, the overcoring method was used using a compact conical probe, developed at the Institute of Geonics AS CR, v.v.i. in collaboration with the Japanese University of Kumamoto under the original name Compact Conical ended Borehole Overcoring method (CCBO). The research report summarizes the results of the performed measurements.
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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
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.
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Structural mapping of exploration geotechnical boreholes walls within 2nd phase – Decline
Waclawik, Petr ; Schuchová, Kristýna ; Kukutsch, Radovan ; Georgiou, Lucie
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.
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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
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.
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