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Srovnání předpokládaných a měřených poklesů v hornické krajině
Doležalová, Hana
There was a repeated GPS surveying done on stabilized points of an observation station that was built in a mining area near Karviná. The GPS surveying was used to document the displays of mine subsidence on the surface above exploited coalfaces. A comparison of the modelled supposed subsidence and the subsidence measured by GPS was done and it has shown on some discrepancies. Presumably the main cause may be seen in the difficult geological and geo-mechanical situation that is not generally included in the modelling of the supposed mine subsidence.
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Observation of phases of surface changes above exploited deposits of sedimentary type
Kajzar, Vlastimil ; Doležalová, Hana ; Staš, Lubomír ; Souček, Kamil ; Šimkovičová, Jarmila
Due to exploitation of coal and other raw materials of sedimentary type there happen many surface changes connected mostly with subsidence, shifts and deformations of the area of interest. Such processes happen mainly in the overlaying strata of exploited coalface. Size and directions of these movements and deformations depend generally on many factors, primarily on geo-mechanical properties of overlaying strata and general technique of exploitation of the deposit. One of the ways of surface observation of time spatial changes is the usage of modern methods for precise determination of changing position of geo-features. Among these methods we rank GPS surveying and usage of methods for gaining data from aerial photogrammetry. Subsequent processing, analysis and modelling of output data by means of modern GIS software offer an efficient source of information for subsequent work and decisions.
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Změny horninového masívu v blízkosti okraje poklesové kotliny
Doležalová, Hana
Repeated geodetic and geophysical surveying near the margin of a creating subsidence depression has shown on a fluctuation of heights of levelled points and on significant rock massif changes. The possible cause of these changes may be found not only in progressive stress-deformational changes due to undermining but also in the changing regime of the groundwater. Confrontation of the levelled height changes with the height of the groundwater level shows that the regime of the groundwater may be a substantial cause of surface height changes. Also the resistivity anomalies found by geophysical measurements can be caused by change of hydro-geological regime.
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Stating the point´s height by levelling
Doležalová, Hana
Earth´s shape is too difficult for geodesy, that´s why we choose different planes of reference. To find out point´s height means to define a plane of reference and to state vertical distance between the plane and the point, it can be done with levelling.
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