Навчально-науковий центр "Мости та тунелі" (раніше Факультет "Мости і тунелі") ДІІТ

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UKR: У ЦЮ СПІЛЬНОТУ ДАНІ НЕ ДОДАЮТЬСЯ
ENG: Educational and Scientific Center (Faculty "Bridges and Tunnels") DIIT

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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.
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    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.
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    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.