Browsing by Author "Kuprii, Volodymyr"

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Analysis of the Impact of the Construction Technology of a Column-Type Metro Station on the Stress-Strain State of its Structure
(Український державний університет науки і технологій, Дніпро, 2025) Kuprii, Volodymyr; Chen, Baochun; Wang, Dongdong; Honchar, S. V.
ENG: Purpose. The purpose of the scientific research is to analyze the influence of the construction technology of the metro column station on the stress-strain state of its structure. The achievement of this goal is based on the numerical analysis of the metro column station, during which the construction stages of the underground facility are taken into account. Methodology. To calculate the stress-strain state of the column-type station structure at different stages of the station lining construction, the modern LIRA-CAD calculation complex was used. Eight stages of the station construction were considered, for which finite element models were developed. After creating finite element models for the eight stages of the column station construction, a numerical analysis was performed. Findings. The main results of the work demonstrate that the correctly selected construction technology is critically important for ensuring the stability of the station structures and minimizing the risks of deformations in the soil. The study considers the stages modeling of the station construction using the LIRA-CAD software package. Thanks to this, accurate data on the structural performance of the structure at different stages of construction were obtained. The results obtained allow to state that the proposed construction technology provides high reliability and durability of the column station, and also minimizes the negative impact on the rock massif. This is confirmed by low settlement values and uniform stress distribution in the structure. Moreover, the proposed safety measures and recommendations for monitoring the condition of structures can be used to increase the efficiency of the station operation in the future. Originality. The originality lies in the fact that the analysis of the results showed that the greatest stresses occur in the connection zones of the central and side tunnels, which requires special attention to the design and construction of columns and lining of the station. Practical value. The practical value lies in the fact that the developed recommendations for strengthening stressed zones allow to significantly increase the safety of operation.
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.
Dependence of the Stress-Strain State of the Metro Running Tunnel Lining on its Shape
(Український державний університет науки і технологій, Дніпро, 2025) Wu, Haoshuai; Bannikov, Dmytro O.; Kuprii, Volodymyr; Wu, Zheye
ENG: Purpose. The purpose of the scientific article is to conduct a numerical analysis of the metro running tunnel to determine, based on the results, the dependence of the lining's stress-strain state on its shape. To achieve this goal, a modeling of a tunnel with a circular outline and an ovoid shape was performed. Methodology. LIRA-CAD is a multifunctional software package for calculation, research and design of structures for various purposes. It is based on the use of the finite element method (FEM), recognized worldwide as the main tool for numerical analysis of the building structures’ strength and stability. Calculation of forces, modeling of changes in the stress-strain state of the structure at the stages of its construction and research of the operation of building structures using the finite element method are performed after specifying the materials and properties of the elements. Findings. Finite element models of the soil massif and tunnel linings of various shapes (circular outline and ovoid shape) were developed for numerical analysis of the system. An analysis of the results of the stress-strain state of the soil massif and tunnel linings was performed, which allowed to draw a conclusion about the discrepancy of the results for different lining shapes. The analysis was conducted for the stress-strain state of linings of various shapes, taking into account the method of construction and their waterproofing, allowing to conclude that ovoid linings, which are constructed by NATM, have advantages in strength and durability. Originality. The originality of the scientific research lies in the analysis of the stress-strain state of the metro running tunnel lining in various engineering and geological conditions, which provides an opportunity to reasonably use calculation methods, the results of which reflect the most reliable operation of the structure for specific engineering and geological conditions. Practical value. The practical value lies in the fact that the developed methodology allows for considering underground structures of complex spatial forms, various models of soil behavior, taking into account the technology of tunnel construction.
Numerical Analysis of Changing the Force Factors in Temporary Lining at the Tunnel Construction by the NATM
(EDP Sciences, 2019) Kuprii, Volodymyr; Petrenko, Volodymyr D.; Kuprik, Sofiia; Kripak, Yevhenii
ENG: Abstract. The paper presents the results of a numerical analysis of force factors in temporary lining at the tunnel construction by New Austrian Tunneling Method (NATM). The relevance of the performed research is substantiated by the complexity of the temporary lining operation in the form of arches combination, anchors, and shotcrete that arose during construction of the Beskydskyi tunnel in Ukraine. NATM, used in construction, is associated with a change in the sectional area of the working and a staged installation of temporary lining, which leads to a gradual change in the stress-strain state of the "temporary lining – surrounding massif" system. In turn, this leads to a change in the force factors (bending moments and normal forces) in temporary lining. In this study, a series of finite-element models simulating the stages of rock excavation and installation of lining elements have been developed and analyzed. The obtained results allowed to determine the cardinal change of force factors in temporary lining, depending on the stage of construction. Changing the force factors at different stages of the tunnel construction by the NATM makes it possible to perform an optimal selection for temporary lining location.
Regularities of the Stress State of the Rock Massif Around the Single-Vault Station under Construction by NATM
(IOP Publishing Ltd, 2022) Radkevych, Anatolii V.; Tiutkin, Oleksii L.; Kuprii, Volodymyr; Tkach, Taisiia
ENG: Subway stations are underground facilities of high responsibility. The use of new construction technologies requires their scientific justification. The single-vault station "Teatralna" of the Dnipro Metro is designed as one that is under construction by the New Austrian tunneling method. Since this type of station is a working of a large cross-section, it is necessary to determine the stress state of the rock massif, which affects the temporary fastening. The finite-element model is developed, which shows the stages of cross-section opening. The developed model reproduces the layout of the subway station in the rock massif and the characteristics of the temporary fastening. The numerical analysis for six stages of station construction is carried out. The distributive features of horizontal stresses and the asymmetry of the stress state of the rock massif are clarified. For the first time, the regularities of the rock massif around the single-vault station under construction by the New Austrian tunneling method are obtained. It is established that the maximum of horizontal stresses appears at the stage of opening the lower left part of the cross-section.
Step-by-Step Analysis of the Condition of the Side Tunnel for a Pylon-Type Metro Station under Construction NATM
(IOP Publishing Ltd, 2026) Radkevych, Anatolii V.; Kuprii, Volodymyr; Dubinchyk, Olha I.; Mazorchuk, Volodymyr F.
ENG: This scientific research provides a step-by-step analysis of the condition of the side tunnel for a pylon-type metro station with combined lining. An analysis of the algorithm for applying the New Austrian Tunneling Method to the construction of underground structures in hard rocks (as in the Dnipro Metro) has been conducted. It is justified that the analysis of the stress-strain state in the combined lining for the side tunnel of a station should be carried out in accordance with the stages of opening the working and installing the combined lining. A finite element model has been developed to represent the stages of side tunnel construction. This model also reflects the station structure’s conditions, its dimensions, and the interaction between the combined lining and the surrounding rock massif. The dependences of horizontal stresses in the rock massif and the bending moment in the combined lining on the stage of construction of the side tunnel have been obtained. The conclusion from the step-by-step analysis in the construction of the side tunnel for a pylon-type metro station, built using the New Austrian Tunneling Method, is that maximum stresses and force factors occur during construction rather than during the operational phase.