Кафедра " Транспортна інфраструктура" ДІІТ (з 2022 року кафедра увійшла до складу факультета Будівництво, архітектура та інфраструктура <br> ( з 2021 року після об'єднання кафедр "Мости та тунелі"; "Колія та колійне господарство"; "Проєктування і будівництво доріг")

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http://crust.ust.edu.ua/handle/123456789/12798
ENG:Department of "Transport Infrastructure"

(since 2021 after the merger of the departments "Bridges and Tunnels"; "Track and track economy"; "Design and construction of roads")

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Browsing Кафедра " Транспортна інфраструктура" ДІІТ (з 2022 року кафедра увійшла до складу факультета Будівництво, архітектура та інфраструктура <br> ( з 2021 року після об'єднання кафедр "Мости та тунелі"; "Колія та колійне господарство"; "Проєктування і будівництво доріг") by Author "Dubinchyk, Olha I."

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    Parametric Analysis of a Strain State of a Soil Base Strengthened with Vertical Elements
    (Dnipro University of Technology, 2024) Tiutkin, Oleksii L.; Radkevych, Anatolii V.; Dubinchyk, Olha I.; Kharchenko,Vitalii
    ENG: Purpose is to identify vertical displacements of the “soil base strengthened with piles or micropiles based upon drilling-mixing technology” system relying upon parametric analysis of strain state of the mentioned system, and arrangement of the strengthening elements. Methods. Mathematical modeling took place for twelve finite-element models using the computing complex SCAD intended to analyze strength of structures by means of finite-element method. Numerical analysis was carried out with variation of elastic-strain modulus of vertical reinforcing elements and change in distance between them (3d and 6d of micropiles). Findings. Results of parametric analysis have been obtained for a model without a micropile (non reinforced soil base); a model with a single micropile; a model with two micropiles where distance between them is 1.5 m, i.e. 3d of micropiles; and a model with two micropiles where distance between them is 3.0 m, i.e. 6d of micropiles. The performed comparative analysis has made it possible to obtain the results proving the hypothesis by the authors as for the specific nature of vertical displacement formation of the “soil base strengthened with piles or micropiles based upon drill-mixing technology” system. Originality. It has been identified for the first time that basing upon the standardized document for the auger or displacement piles, it is impossible to decrease efficiently vertical displacements while approaching micropiles since distance between the micropiles is 3d for elements, developed on the basis of the drilling-mixing, is minimal. Practical implications. The obtained results of a strain state may become the keystone for the development of the generalized strain theory of the composite “soil base strengthened with piles or micropiles based upon drilling-mixing technology” system as a medium differing in minor changes of strain characteristics.
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    Regularities of the Strain State of the Embankment when Varying the Vertical Element Length of Strengthening
    (IOP Publishing, 2024) Alkhdour, Ahmad M.; Tiutkin, Oleksii L.; Dubinchyk, Olha I.; Miroshnyk, Vitalii
    ENG: The crisis that arose during the war in the transport system of Ukraine provided an opportunity to review the concept of integrating the Ukrainian railway into the European network. Corresponding changes, which require reconstruction of the railway, including track and embankment, have been analyzed. The railway embankment needs strengthening for its normal operation. The embankment reinforced with vertical elements, namely piles, has been studied. A finite-element model of the embankment, its soil base, and the rail-sleeper grid has been created. This model shows a vertical element of strengthening with lengths of 2.0, 4.0, and 6.0 m. The results of the numerical analysis are obtained, which makes it possible to analyze the values of horizontal and vertical displacements. The values of both components of the strain state are analyzed. The results of the analysis prove that strengthening with such elements has a maximally positive effect on both components of deformation. The regularities of changes in embankment displacements, when varying the vertical element length of strengthening, are linear. They prove that the presence of piles reduces the horizontal component by 1.1 ... 1.32 times, and the vertical one by 1.1 ... 1.24 times.