The comparative analysis of the stress-strain state of the support of the escalator tunnel constructed in weak soils by the NATM

Radkevych, A. V.; Tiutkіn, O. L.; Kuprii, Volodymyr; BIELIKOVA, S. I.

doi:10.1088/1755-1315/970/1/012002

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…As a result, the frame operates into a load that is significantly less than if it had been installed before the massif destressing and therefore may have a smaller thickness. However, this fact raises a number of questions, the main of which is ensuring the strength of the rock massif around the underground structure, since even for classified hard rocks there is a risk of cracks in the massif and shotcrete [5,6], especially during drilling-and-blasting operations [7]. According to the construction project of the "Teatralna" metro station, the temporary fastening is provided precisely in the form of shotcrete reinforced with steel mesh mat and anchor lining, and monolithic reinforced concrete as a permanent frame [8,9].…”

Section: Introductionmentioning

confidence: 99%

Regularities of the stress state of the rock massif around the single-vault station under construction by NATM

Radkevych

Tiutkіn

Kuprii

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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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.

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Section: Introductionmentioning

confidence: 99%

Regularities of the stress state of the rock massif around the single-vault station under construction by NATM

Radkevych

Tiutkіn

Kuprii

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Substantiation of the Escalator Tunnel Construction Technology Based on the Results of Field Research

Bielikova,

Tiutkin

2023

STP

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Purpose. The authors aim to substantiate a new technology for the construction of an escalator tunnel in Ukraine based on the results of field studies performed as part of surveying measurements during the construction of the inclined run of the Dnipro metro. Methodology. The article analyzes the main technology of the escalator tunnel construction, which was based on the development of an inclined working from top to bottom with preliminary preparation of the massif by means of artificial soil freezing. Several cases of application of the bottom-up escalator tunnel construction method using the New Austrian Tunneling Method (NATM), which is successfully used in metro of other countries, are considered. The main principle of the method is that a shotcrete system is used as a temporary (primary) support, and a reinforcement system with monolithic concrete is used as a permanent support. Findings. The authors analyzed the peculiarities of the escalator tunnel excavation of the Dnipro metro by the Turkish company «Limak» in 2017–2018. It was noted that the excavation was carried out from the bottom up in conditions of strong rock (plagiogranite) using drilling and blasting operations. The characteristic results of field studies during drilling and blasting operations in the process of developing the calotte are analyzed. On the basis of these data, it is possible to trace the tendency to the appearance of minor overburden during sinking. The value of the deformed state (displacement of the contour of the designed casing) is within the normative limits, which indicates the effective use of these works within the framework of NATM. It is proved that in the conditions of military operations, the technology of building an escalator tunnel from the bottom up is a guarantee of the safety of workers and equipment. Originality. The results of the scientific work presented in the article make it possible to determine the level of deformed state during the excavation of the escalator tunnel of the Dnipro metro in hard rocks. During the field studies, the dependences of deformation of plagiogranite in the inclined bore were obtained. Practical value. An alternative technology for the construction of a bottom-up escalator tunnel based on NATM with the provision of normative deformation of the surrounding rock mass is substantiated.

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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

Cited by 2 publications

References 5 publications

Regularities of the stress state of the rock massif around the single-vault station under construction by NATM

Regularities of the stress state of the rock massif around the single-vault station under construction by NATM

Substantiation of the Escalator Tunnel Construction Technology Based on the Results of Field Research

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