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DOI: 10.15862/01SATS325 (https://doi.org/10.15862/01SATS325)

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Sokornov A.A., Konkov A.N., Ledyaev A.P. Stress-strain state of the support parts of the ventilation duct slab in a double-track running tunnel of a metro. Russian Journal of Transport Engineering. 2025; 12(3). Available at: https://t-s.today/PDF/01SATS325.pdf (in Russian). DOI: 10.15862/01SATS325

Stress-strain state of the support parts of the ventilation duct slab in a double-track running tunnel of a metro

Anton A. Sokornov, Alexandr N. Konkov, Alexandr P. Ledyaev

Emperor Alexandr I Saint Petersburg State Transport University, Saint Petersburg, Russia

Corresponding author: Anton A. Sokornov, e-mail: scarlunch@mail.ru

Abstract. Double-track metro tunnels constructed by a large-diameter tunnel boring complex in heterogeneous quaternary deposits are a relevant topic for scientific research from both the design and operation perspectives. One of their structural differences from single-track running metro tunnels is the presence of a ventilation duct, separated from the track section of the tunnel by a monolithic reinforced concrete slab supported on steel beams. However, the static behavior of internal structures is not sufficiently covered in the scientific literature. The aim of the research was to assess the stress-strain state of the support parts of the ventilation duct slab in a double-track running tunnel of the metro on a section of the Nevsko-Vasileostrovskaya Line of the Saint Petersburg Metro. The authors built a mathematical three-dimensional model of the «soil massif — tunnel lining — rigid base — ventilation duct slab» system. The modeling was performed using the finite element method with the capability to set individual stages of tunnel driving and installation of internal structures. As a result of the research, criteria for assessing the serviceability of the support parts of the ventilation duct slab were developed, and the influence of the stress-strain state of the tunnel lining on the stress-strain state of the support parts of the slab was evaluated. An assessment of the serviceability of the support parts of the ventilation duct slab was also performed in case of failure of individual support parts, as well as with an increase in the live load. The constructed model can be applied in the development of technological regulations for repair work in the ventilation duct space due to its ability to simulate virtually any scenario.

Keywords: tunnel; lining; tunnel boring machine; finite element method; mathematical modeling; ventilation duct; stress-strain state

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