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Start Over Subject Geologie. Meteorologie. Klimatologie

213. Geological conditions and local changes of vertical deflections

Creator:
Szczerbowski, Zbigniew, Banasik, Piotr, and Kudrys, Jacek
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, nivelace, leveling, salt tectonics, gravitational effect, plumb line direction, 7, and 551
Language:
English
Description:
The paper presents local changes of plumb line direction in the area of Inowrocław, central Poland. The changes were determined by geodetic (GPS, leveling) and gravimetric surveys. The presented conclusions point out that increasing resolution of a precise quasigeoid model in areas with variable distribution of rock mass is necessary. The final results of the paper are suggestions concerning a practical approach applied to obtain proper values of plumb line deflections that can be useful for further detail research for making more precise local models of the quasigeoid., Zbigniew Szczerbowski, Piotr Banasik and Jacek Kudrys., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

214. Geological constraints on the GPS and precice levelling measurements along the Diendorf-Čebín tectonic zone

Creator:
Lubomil Pospíšil, Otakar Švábenský, Josef Weigel, and Witiska, Michal
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, nivelace, GPS sítě, geodynamika, geofyzika, leveling, GPS netwoks, geodynamics, geophysics, Morava (Česko), Moravia (Czechia), Diendorf fault, Boskovice Furrow, Moldanubian, Brunnia units, 7, and 551
Language:
English
Description:
In the contribution geological structure and geophysical data along the northern part of the Diendorf-Čebín tectonic zone (DCTZ) is analyzed in relation to the position of the measured GPS test areas and precise levelling profiles. For this purposes the former geophysical data have been reambulated and analyzed, too. Revision of geological knowledge and sources has been done in places of the proposed polygons. The results of reinterpretation of the Grav/Mag data and selected seismic reflection profiles suggest new possibilities and variety of structural interpretations of this tectonic zone. It is evident that the whole tectonic system has undergone complicated tectonic development during the Paleogene and Neogene. Therefore the recent mapping and analyses by GPS and precise levelling have to be realized in places where the geological structural ambiguity has to be eliminated., Lubomil Pospíšil, Otakar Švábenský, Josef Weigel and Michal Witiska., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

218. Geomechanical effects of operation and closing the Idrija Mercury Mine on the environment

Creator:
Likar, Jakob
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, doly, mines, Mercury Mine, cross-stope mining method, backfilling, sublevel mining method with consolidated backfill, low bearing capacity rock structure, geotechnical measurement, 7, and 551
Language:
English
Description:
The past five centuries of the Idrija Mercury Mine’s operation have had consequences on the environment, which have directly influenced the deformations developing in the wider exploration area. During the many years of mercury ore exploitation, the cross-stope mining method with backfilling from bottom to top was used. This has strongly transformed the stress-strain field in the surrounding rocks and caused long-term deformation processes that are still in progress. This is because the deformations have a small time gradient and thus bigger breaks or faster sliding terrain above old mine workings are not expected. The surface movements are bigger in the area built of Permian-Carboniferous, low-bearing-capacity rocks, which in the past was destroyed by major tectonic movements in the rock structure. Mine closure works, which included grouting and hardening of destroyed underground areas, as well as filling parts of the mine and backfilling empty spaces (i.e., mine roadways, blind shafts), are finished. The efficiency of mine shutdown works is constantly being verified by means of geotechnical and other measurements and observations, and will continue in the future., Jakob Likar., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

219. Geomechanical parametres of the Podlesí granites and their relationship to seismic velocities

Creator:
Nováková, Lucie, Sosna, Karel, Brož, Milan, Najser, Jan, and Novák, Petr
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, žuly, pórovitost, granites, porosity, Poisson’s ratio, seismic waves, Young’s modulus, shear modulus, 7, and 551
Language:
English
Description:
We studied the geophysical, physical, and geomechanical parameters of the Podlesí granites in the western part of the Krušné hory Mts., near the village of Potůčky. The granites represent a fractionated intrusion within the Nejdecký Massif. In total, the studied borehole is about 300 m deep. The samples were collected at depths of between 35 and 105 metres. Seismic P-wave and S-wave velocities were measured using ultrasonic scanning. The samples were water-saturated, unsaturated, and dried. The ultrasonic scanning system consisted of four piezoelectric sensors and a digital oscilloscope recorder. The wave frequency was 1 MHz. P-wave velocities range from 4400 m.s-1 to 6500 m.s-1 while S-wave velocities range from 2800 m.s-1 to 3800 m.s-1. These data were used to calculate dynamic Young’s modulus, dynamic shear modulus, and Poisson’s ratio. The deformational characteristics of the rock were specified from experimental loading of the sample with uniaxial strain. The shear and longitudinal deformation of each sample was measured using a resistive strain gauge fixed directly on the sample. Intermittent loading of the samples proceeded using a uniform gradient of axial stress of 1 MPa.s-1. The samples were subjected to five separate loads. During the tests, following parameters were recorded: stress, longitudinal deformation, and shear deformation. These data were used to calculate static Young’s and shear modulus, and Poisson’s ratio., Lucie Nováková, Karel Sosna, Milan Brož, Jan Najser and Petr Novák., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

220. Geometric deformation analysis in free geodetic networks: case study for Fruška Gora in Serbia

Creator:
Sušić, Zoran, Batilović, Mehmed, Ninkov, Toša, Bulatović, Vladimir, Aleksić, Ivan, and Nikolić, Gojko
Format:
print, bez média, and svazek
Type:
article, články, journal articles, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, geodetické sítě, geodetic networks, Srbsko, Serbia, CDA, robust estimation, strain analysis, 7, and 551
Language:
English
Description:
The deformation measurements are performed for the purpose of obtaining information concerning ground movement and objects on the ground within given time intervals. For the purpose of improving conventional models of deformation analysis (CDA) it is desirable to use several different methods and also implement alternative proce dures as a further improvement, such as the concept of robust geodetic networks and strain analysis, aimed at obtaining objective information about the movements. In the present paper, in addition to the CDA methods, we also analyze the robust methods in deformation detecting and the method of the strain analysis based on elasticity theory as a supplement to the conventional geometric deformation methods (CDA). The mentioned methods are applied and analysed for the case of a test example of Fruška Gora in Serbia, for which there exist geological and geophysical studies of recent tectonic movements. The measuring results for two measuring epochs concern the GNSS vectors measured by applying the fast static method within closed polygons over a ten-year interval, where only the horizontal movement component is analysed. The efficiency of the applied CDA and robust methods is measured by applying a mean success rate (MSR) by applying Monte Carlo simulations in order to investigate the efficiency of a given methods for a given control network., Zoran Sušić, Mehmed Batilović, Toša Ninkov, Vladimir Bulatović, Ivan Aleksić and Gojko Nikolić., and Obsahuje bibliografické odkazy
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

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