Browsing by Author "Bielikova, Sofiia"

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The Comparative Analysis of the Stress-Strain State of the Support of the Escalator Tunnel Constructed in Weak Soils by the NATM
(IOP Publishing Ltd, 2022) Radkevych, Anatolii V.; Tiutkin, Oleksii L.; Kuprii, Volodymyr; Bielikova, Sofiia
ENG: The construction of underground objects of the subway is always associated with building of structures connecting the surface. For subways, such structures are escalator tunnels. During the construction of the Dnipro Metro, these underground structures are built using a new technology that forms a multilayered support. This technology is the New Austrian tunneling method. A special feature of its application under the conditions of the Dnipro city is the existence of weak rocks in the upper part of the escalator tunnel. To ensure their stability, various special operational techniques are used that impact the rock massif. The basic techniques include artificial freezing, which was the dominant strengthening technology, and chemical strengthening (cementation), which is more consistent with the New Austrian tunneling method. To elucidate the effectiveness of the two strengthening techniques, a finiteelement model of the Dnipro Metro escalator tunnel has been built. The numerical calculation of two variants for the strengthening of weak soils yielded results for a comparative analysis of the stress-strain state. The result of the comparative analysis is the conclusion of greater cementation efficiency when strengthening weak soils of the massif in which the escalator tunnel is constructed using New Austrian tunneling method.
Numerical Analysis of a Single-Vaulted Metro Station Options
(Український державний університет науки і технологій, Дніпро, 2025) Smolianiuk, N. V.; Bielikova, Sofiia; Zhang, Qianhui; Zhu, Yibiao
ENG: Purpose. The purpose of the study is a numerical analysis of a single-vaulted metro station options, the performing of which allows determining which of the options passes the strength check. The results of the numerical analysis using the finite element method, which allows to determine the strength of the station structure, are the values of the stress-strain state, as well as equivalent stresses. Methodology. An analysis of the lining stress-strain state for variating structural solutions was carried out, for which the model reproduced half of the single-vault station structure with the addition of a second invert. The single-vault station models were built based on real geometric dimensions using the professional calculation software Structure CAD for Windows, version 7.29 R.3 (SCAD). Findings. In recent years, the single-vaulted metro station has become the underground structure most often used during construction. The design options for the single-vaulted station proposed by designers necessarily require scientific substantiation. As part of the study, the results of which are presented in the article, a numerical analysis of the single-vaulted station, which has two design options, was performed. The created finite element models reflect the features of the developed options in a spatial setting. The numerical analysis performed for dead weight and moving load allowed for finding out the parameters of the stress-strain state. Based on the determined parameters, the overall strength and stability of the single-vaulted station were evaluated and recommendations for their increase were provided. Originality. The originality of the study consists of the obtained results of numerical analysis for a single-vaulted metro station options, which allowed to find out which of the options passed the strength check. Practical value. The practical value lies in obtaining the results of the calculation using the finite element method, which allowed to find the strength of the station structure and reasonably choose the metro station option.
Stress-Strain State of a Metro Vestibule under Impact Loading, Considering the Depth of the Structural Arrangement
(Széchenyi István University, Győr, Hungary, 2026) Tiutkin, Oleksii L.; Dubinchyk, Olha I.; Bielikova, Sofiia
ENG: The paper analyses the structure of a metro vestibule and considers the possibility of impact loading affecting it. Three-dimensional finite element models were developed to research changes in the stress-strain state of the metro vestibule. The models reflect the complex structure of the vestibule, including the excavation support as a “slurry wall” and the depth of the structural arrangement. The developed models simulate three depths of the structural arrangement (1.8 m; 3.6 m; 7.2 m). A numerical analysis of the models was performed to estimate the impact loading applied as a quasi-static effect. The patterns of changes in the stress-strain state of the metro vestibule, considering the depth of the structural arrangement, were obtained. A reinforced-concrete slab is proposed as the reinforcement structure for the vestibule. A numerical analysis of the reinforcement structure for impact loading was performed.
Stress-Strain State of a Metro Vestibule under Impact Loading, Considering the Depth of the Structural Arrangement (Preprint)
(Széchenyi István University, Győr, Hungary, 2025) Tiutkin, Oleksii L.; Dubinchyk, Olha I.; Bielikova, Sofiia
ENG: The paper analyses the structure of a metro vestibule and considers the possibility of impact loading affecting it. Three-dimensional finite element models were developed to research changes in the stress-strain state of the metro vestibule. The models reflect the complex structure of the vestibule, including the excavation support as a “slurry wall” and the depth of the structural arrangement. The developed models simulate three depths of the structural arrangement (1.8 m; 3.6 m; 7.2 m). A numerical analysis of the models was performed to estimate the impact loading applied as a quasi-static effect. The patterns of changes in the stress-strain state of the metro vestibule, considering the depth of the structural arrangement, were obtained. A reinforced-concrete slab is proposed as the reinforcement structure for the vestibule. A numerical analysis of the reinforcement structure for impact loading was performed.