Modeling wind and air temperature effect on propagation of smoke and toxic gases during fire on metro bridge

The transportation system in Moscow enjoys active and intense development, including the underground space. The Moscow Metro features construction of new lines—Big Circle Line, Sokolnicheskaya, Solntsevskaya, Lyublino-Dmitrovskaya, Troitskaya, RublevoArkhangelskaya and Biryulevskaya Lines, as well as many connection lines and engine house access tracks. Some metro lines built on ground surface often include metro bridges which are the objects of heightened danger when on fire. The metro bridges are the subject of this research. There are currently no norms and procedures to assess safety of approved design choices on metro bridges. The validation of the project-specific technical specifications and design choices used ANSYS CFD software. For determining initial and boundary conditions for the modeling, the climate research was performed in the location region of the metro bridge. The modeling studied the gas dynamics of toxic combustion products CO, CO2 and HCl, and smoke in different sites of the metro bridge. The studies show that situation is the worst at zero wind. Wind accelerates removal of toxic gases and smoke. Removal of hazardous impurities runs differently in different sites. For example, the modeling finds out that toxic substances and smoke accumulate at the metro portals equipped with concrete enclosures. Such areas require extra activities to be developed to ensure the fire safety. The calculations determine the air temperature effects on natural ventilation of a metro bridge on fire.

Kobylkin S. S., Kaledina N. O., Kobylkin A. S. Modeling wind and air temperature effect on propagation of smoke and toxic gases during fire on metro bridge. MIAB. Mining Inf. Anal. Bull. 2022;(11):147-162. [In Russ]. DOI: 10.25018/0236_1493_2022_11_0_147.

S.S. Kobylkin¹, Dr. Sci. (Eng.), Professor, e-mail: kobylkin.s@misis.ru, ORCID ID: 0000-0002-2626-208X,
N.O. Kaledina¹, Dr. Sci. (Eng.), Professor, e-mail: nok52@mail.ru,
A.S. Kobylkin, Cand. Sci. (Eng.), Senior Researcher, Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia, e-mail: aleksandr@kobylkin.ru, ORCID ID: 0000-0002-1512-890Х,
¹ Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

S.S. Kobylkin, e-mail: kobylkin.s@misis.ru.

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