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    Wyświetlanie 1-4 z 4
    Tytuł:
    Deformation monitoring surveys - old problems and new solutions
    Autorzy:
    Chrzanowski, A.
    Szostak-Chrzanowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/225555.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    monitorowanie deformacji
    zintegrowana analiza deformacji
    modelowanie deterministyczne
    GPS
    deformation monitoring
    integrated deformation analysis
    deterministic modelling
    Opis:
    Growing need for fully aulomated and continuous monitoring of structural and ground deformations creates new challenges for the design and analysis of monitoring schemes in which multi-sensor systems start playing a dominating role. At the same time, old problems of effects of atmospheric refraction and identification of unstable reference points still remain valid. On the other hand, rapid progress in deterministic modeling of deformation makes the design and integrated analysis of the multi-sensor monitoring surveys easier and more efficient than in the past. Through the combination of deterministic modeling with the results of monitoring surveys, a better understanding of the behaviour of deformable objects is achieved. Examples are given from monitoring large dams and open pit mines.
    Źródło:
    Reports on Geodesy; 2009, z. 2/87; 85-103
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interconnection between monitoring and deterministic modeling of the behavior of large earth dams
    Autorzy:
    Szostak-Chrzanowski, A.
    Massiera, M.
    Chrzanowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/225009.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    zapora ziemna
    zapora narzutowa
    monitoring przemieszczeń
    pomiary geodezyjne
    earth dam
    fockfill dam
    monitoring of displacements
    engineering surveying
    Opis:
    Monitoring of deformations, whether using geodetic or geotechnical instrumentation, besides providing a warning system in case of an abnormal behaviour of the dam, may be used as a tool for a verification of design parameters. By comparing results of monitoring measurements with a deterministic (a-priori) model of deformation, one may determine and explain causes of deformation in a case of unexpected behaviour of the investigated object and its surrounding. Thus, the role of monitoring becomes much broader than just the conventional determination of the status of the deformable object. On the other hand, a predicted behaviour of the dam may be used in designing the monitoring scheme, giving information on the magnitude and location of the expected maximum deformation parameters. In addition, with properly designed monitoring surveys, one may also determine the actual deformation mechanism. The discussed problems are illustrated by three types of earth dams located in California, USA, and in Quebec, Canada.
    Źródło:
    Reports on Geodesy; 2007, z. 1/82; 345-351
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deterministic modelling of deformations as a tool for designing geodetic monitoring schemes
    Autorzy:
    Szostak-Chrzanowski, A.
    Chrzanowski, A.
    Bond, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/225017.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    monitoring przemieszczeń
    pomiary geodezyjne
    monitoring of displacements
    geodetic deformation monitoring
    engineering surveying
    Opis:
    The design of geodetic deformation monitoring schemes requires decisions to be made regarding the optimal location, density, and accuracy of geodetic sensors and targets. All too often, however, the location of the instruments and accuracy of monitoring are decided upon without regard for the expected location and magnitude of the maximum deformations of the monitored object. This can lead to incorrect interpretations of the behavior of the investigated object. A more rigorous approach is to use deterministic (a-priori) modeling of expected displacements derived from the knowledge of the geometry of the object and its environment, causative factors (loads), properties of the material, and physical laws governing the stress-strain relationship. In order to demonstrate how deterministic modeling can be used to design a geodetic scheme for deformation monitoring, an open pit mine scenario was investigated. Finite element analysis was applied to the open pit mine to obtain a prediction model of deformations at various stages of the mine development.
    Źródło:
    Reports on Geodesy; 2007, z. 1/82; 337-344
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concrete face rockfill dams - new chalenges for monitoring and analysis
    Autorzy:
    Szostak-Chrzanowski, A.
    Massiera, M.
    Deng, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/225356.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    betonowa tama kamiennych twarzy
    analiza deformacji
    metody elementów skończonych
    concrete face rockfill dam
    deformation analysis
    finite element method
    Opis:
    Concrete face rockfiil dams (CFRDs) are gaining a worldwide recognition as the most economical type of dams to be constructed in extreme northern and sub-Antarctic regions. Safety of CFRDs depends on the proper design, construction, and monitoring of tual behaviour during the construction and during the operation of the structure. The main concern for the safety of CFRDs is the deformation of the concrete face. During the reservoir filling, the load of water and deformations of the dam rockfiil force upstream concrete slab to deform. The displacements of the concrete face during the reservoir filling should not exceed the maximum allowed values in order to maintain the structural integrity of the concrete face. Due to uncertainty of the model parameters, careful monitoring of the dams and their surroundings are required in order to verify and enhance the model. This paper presents a study of the behavior of the upstream concrete face slabs and internal displacements that develop in the rockfiil during construction and during filling the reservoir. The research is based on two examples: the Toulnustouc Dam (75 m) located in Northern Quebec, Canada, and the Shuibuya Dam in P. R. China, the tallest (233 m) concrete face rockfiil dam in the world. The results of in study serve also as a basis for designing deformation monitoring schenies for the conete face rockfiil dams.
    Źródło:
    Reports on Geodesy; 2009, z. 2/87; 381-390
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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