Екологічна безпека та природокористування

Постійне посилання на фондhttps://repositary.knuba.edu.ua/handle/987654321/125

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Ключові словаsearch.filters.applied.operator.equals: search.filters.subject.pile

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  • Документ
    Vibrodinamic monitoring of pile foundation engineering on landslide hazardous site in dense urban development conditions
    (ІТГІП, 2018) Kaliukh, Iurii I.; Lebid, Oleksij G.; Dunin, Volodimyr A.; Margvelashvili, Nugzar; Berchun, Yaroslav O.; Samoilenko, Sergiy M.
    An example of the application of modern regulatory requirements for the scientific and technical support of construction and monitoring of building structures for the safe arrangement of the pile foundation on a landslide hazardous building site in conditions of dense urban development in Kyiv during the installation of a Ø820 mm bored pile according to the plan of the pile field has been considered. Experimentally registered levels of vibration acceleration on the foundation wall of the building in the vertical and horizontal directions do not exceed 0.015 m/s², which is significantly lower than the minimum permissible values of vibration acceleration for the foundations of buildings with brick bearing walls 0,15 m/s². The research also evaluated the presence of visible damage to the building in the available places and their possible development before and after piles placement. The condition of the plaster screed on a vertical crack in the wall of the house on the 8th floor, which was installed before the start of construction work, after pile foundation installation has not changed – it remained undamaged.
  • Документ
    Іdentification of defects of the piles with reflected waves
    (ІТГІП, 2018) Lebid, Oleksij; Kaliukh, Iurii; Berchun, Yaroslav; Chernyshev, Dmytro
    Using current mathematical models of wave processes does not allow diagnosing defects in piles with sufficient accuracy. The necessity of creating of a pile generalized dynamic model which would allow to receive more reliable signals of wave processes in reinforced concrete piles has been substantiated. For numerical simulation of dynamic processes, a flat scheme for an axisymmetric pile based on the finite element method of "deep beam" within LIRA software complex was used. Sand was chosen as the soil around the pile due to the fact that sand and concrete characteristic impedance is very different, which provides a good echo from the pile toe (from the interface of the media). A comparative analysis of the results of mathematical modeling has made it possible to state that the most informative (in terms of differences in the comparison of graphs from one another), both for time signals and amplitude spectra, is the application of a horizontal impact on the lateral surface near the border with the pile base and the signal recording that comes to the speed sensors located in the vertical direction on the pile head near the border with the lateral surface. This option will be thoroughly tested numerically and experimentally in subsequent authors' studies.