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    Wyświetlanie 1-3 z 3
    Tytuł:
    Investigation of stability of precise geodetic instruments used in deformation monitoring
    Autorzy:
    Woźniak, M.
    Odziemczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/106803.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    geometry of instrument’s axis
    instrument stand
    deformation monitoring
    geodetic control measurements
    geometria osi instrumentu
    stojak na instrumenty
    monitorowanie deformacji
    pomiary kontrolne geodezyjne
    Opis:
    Monitoring systems using automated electronic total stations are an important element of safety control of many engineering objects. In order to ensure the appropriate credibility of acquired data, it is necessary that instruments (total stations in most of the cases) used for measurements meet requirements of measurement accuracy, as well as the stability of instrument axis system geometry. With regards to the above, it is expedient to conduct quality control of data acquired using electronic total stations in the context of performed measurement procedures. This paper presents results of research conducted at the Faculty of Geodesy and Cartography at Warsaw University of Technology investigating the stability of “basic” error values (collimation, zero location for V circle, inclination), for two types of automatic total stations: TDA 5005 and TCRP 1201+. Research provided also information concerning the influence of temperature changes upon the stability of investigated instrument’s optical parameters. Results are presented in graphical analytic technique. Final conclusions propose methods, which allow avoiding negative results of measuring tool-set geometry changes during conducting precise deformation monitoring measurements.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2017, 104; 79-90
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geodetic monitoring of earth-filled flood embankment subjected to variable loads
    Autorzy:
    Kuras, P.
    Ortyl, Ł.
    Owerko, T.
    Borecka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/106723.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    flood embankment
    river levee
    geodetic monitoring
    control network
    displacements
    wał przeciwpowodziowy
    monitoring geodezyjny
    sieć sterowania
    przemieszczenia
    Opis:
    The article presents an example of supplementing geotechnical monitoring with geodetic observations. The experimental flood embankment built within the ISMOP project (Information Technology System of Levee Monitoring) was subjected to continuous monitoring based on built-in measuring sensors. The results of geodetic monitoring used for observation of earth-filled flood embankment subjected to external loads are presented in the paper. The tests were carried out on an experimental flood embankment forming a closed artificial water reservoir. The observations were carried out for two purposes. The first was long-term monitoring, which was aimed to determine the behaviour of the newly built embankment. The second purpose was to check the reaction of the levee to the simulated flood wave, caused by filling and draining the reservoir. In order to monitor the displacements of the earth-filled embankment, it was necessary to develop the proper methodology. For the needs of research works, an appropriate network of 5 reference points and 48 survey markers has been designed and established. The periodic measurements were carried out using precise robotic total station. The stability of the reference frame was each time checked and displacements of survey markers were determined based on it. The final results allow to reveal the reaction of levee to external loads. The displacement values were referred to the course of the filling and draining experiment to indicate the relationship between them. In the field of long-term monitoring the results clearly imply the dominance of displacements outside the reservoir for points located on the embankment, in contrast to points on the crest and foreground, which do not show significant movements. On the other hand, in the field of testing the embankment reaction to the flood wave, obtaining reliable results was possible thanks to high-accuracy geodetic measurements. Small displacement values, often at the level of their determination errors, were averaged for groups of points with the same height of foundation. A sizable number of points allows to perceive some tendencies and the relation between embankment soaking and its movement directions can be noticed. During periods when the levee was still saturated with water, slight movements outside the reservoir were revealed. On the other hand, the following period of drying caused movement in the opposite direction.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2018, 106; 9-18
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of large concrete object geometrical model based on terrestrial laser scanning
    Autorzy:
    Zaczek-Peplinska, J.
    Popielski, P.
    Kasprzak, A.
    Wójcik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/106781.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    terrestrial laser scanning
    numerical modelling
    finite elements method
    technical control of dam
    geodetic inventory
    skanowanie laserowe naziemne
    modelowanie numeryczne
    metoda elementów skończonych
    kontrola techniczna tamy
    inwentaryzacja geodezyjna
    Opis:
    The paper presents control periodic measurements of movements and survey of concrete dam on Dunajec River in Rożnów, Poland. Topographical survey was conducted using laser scanning technique. The goal of survey was data collection and creation of a geometrical model. Acquired cross- and horizontal sections were utilised to create a numerical model of object behaviour at various load depending of changing level of water in reservoir. Modelling was accomplished using finite elements technique. During the project an assessment was conducted to terrestrial laser scanning techniques for such type of research of large hydrotechnical objects such as gravitational water dams. Developed model can be used to define deformations and displacement prognosis.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2014, 97; 91-102
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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