Ключевые слова
evacuation
flexible element
saving life
fire development under the ground
Как цитировать
Аннотация
The paper considers various scenarios of fire development in road tunnels. The dynamics of combustion products propagation is studied by taking into account the fire strength, tunnel geometry and layout, and aerodynamics of the ventilation flow. The impact of strong fires on the sustainability and proper operation of ventilation systems is demonstrated, and different types of numerical models are considered with the FDS software environment. Theoretical and numerical experiments have demonstrated that strong fires in tunnels can induce dynamic pressures greater than the static pressures of the tunnel fans. The latter can change the direction of movement of ventilation flows in the tunnels with an inclination of 3% or more when the seat of fire is at a hypsometrical height lower than the air supply portal, thus drastically impairing the self-evacuation capability of people in the disaster zone. It was demonstrated that one of the most reliable ways to save lives in case of fire is to limit the spread of flue gases to prolong the time for evacuation. The paper proposes a transformable flexible system to save lives, which artificially increases the aerodynamic resistance of tunnels to prevent the propagation of harmful combustion products on the people’s evacuation route. By considering the fire development scenarios in horizontal and inclined tunnels, the dynamics of the spread of the fire damaging factors when ventilation system is no longer operable and the only solution is the use of the flexible system is examined. The results of modeling evidence that by closing 50% of the tunnel cross-section with a flexible system it is possible to obtain important positive results in reducing the spread of combustion products and saving lives. The use of the proposed system reduces the intensity of the spread of fire hazards and will definitely help the people in the disaster zone. The analysis carried out clearly shows its necessity and that the comprehensive study of fires and generalization of study results will be useful in adequate planning and implementing future measures to prevent and reduce their harmful effects. Following the above-mentioned, a detailed description, analysis and development of a clear algorithm of action of fire cases, and communicating the results to rescuers, tunnel service personnel and the general public are needed.
Библиографические ссылки
Amelchukov S.P., Korotkov I.A., (2007), Fire curtain. Russian Patent, No. 2351378 C1, (Russian).
Atkinson G.T., Wu Y., (1996), Smoke control in sloping tunnels, Fire Safety Journal, 27, 335–341.
Bettelini M., Rigert S., Seifert N., (2012), Flexible devices for smoke control in road tunnels, 6th International Conference “Tunnel Safety and Ventilation”, Graz, 265-272.
Beard A.N., Carvel R.O., (2005), The Handbook of Tunnel Fire Safety, Thomas Telford Publishing, London, 2005.
Chow W.K. et al., (2015), Smoke movement in tilted tunnel fires with longitudinal ventilation, Fire Safety Journal, 75, 14–22.
Commission Directive 2004/102/EC, (2004), On minimum safety requirements for tunnels in the Trans-European Road Network, THE EUROPEAN PARLIAMENT AND OF THE COUNCIL OF THE EUROPEAN UNION, On line at: http://www.ocean-commerce.co.jp/ISPM_Report/pdf_countries/EUDirective2004102EC.pdf
Deberteix P., Gabay D., Blay D., (2001), Experimental study of fire-induced smoke propagation in a tunnel in the presence of longitudinal ventilation, in Proceedings of the International Conference on Tunnel Fires and Escape from Tunnels, Washington.
Fermi E. (1937) Thermodynamics, New York, Prentice-Hall Inc: 140.
Ilias N., Lanchava O., Nozadze G., (2017), Numerical modelling of fires in road tunnels with longitudinal ventilation system, Supplement of Quality-Access to Success, Bucharest, 18, 85-88.
Ingason H., Li Y.Z., (2010), Model scale tunnel fire tests with longitudinal ventilation, Fire Safety Journal, 45, 371–384.
Ingason H., Li Y.Z., (2011), Model scale tunnel fire tests with point extraction ventilation, Journal of Fire Protection Engineering, 21(1), 5-36.
Lanchava O.A., (1982), Heat and mass exchange in permanent mine workings, Soviet Mining 18 (6), 529-532.
Lanchava O.A., (1986), Heat and mass exchange in newly driven mine workings, Sov. Min. Sci. (Engl. Transl.); (United States) 21 (5).
Lanchava О.А., Lebanidze Z.B., (1982), Po povodu kollapsa sistemj ventilatsii tonnelia v sil’nom pojhare, Transport, 3-4 (31-32), 29-31 (Russian).
Lanchava O., Nozadze G., Bochorishvili N., Lebanidze Z., Arudashvili N., Jangidze M., Tsikarishvili K., (2014), Criteria for evaluation of emergency firefighting in transport tunnels, “Transport Bridge Europe-Asia”, Materials of International Conference, 29-34, Tbilisi.
Lanchava O., Abashidze G., Tsverava D., (2017), Securing fire safety for underground structures, Supplement of Quality-Access to Success, Bucharest, 18, 45-50.
Lanchava O., Ilias N., (2017), Some issues of thermal calculation of ventilation air for the metro, Journal of Engineering Sciences and Innovation, Bucharest, 2 (2), 92-105.
Lanchava O., Ilias N., (2018), Complex calculation method of temperature, mass transfer potential and relative humidity for ventilation flow in subway, Journal of Engineering Sciences and Innovation, Bucharest, 3 (1), 69-84.
Lanchava O., Ilias N., Nozadze G., Radu S.M., (2019, A), Heat and hygroscopic mass exchange modelling for safety management in tunnels of metro, Supplement of Quality-Access to Success, Bucharest, 20, 27-33.
Lanchava O., Ilias N., Nozadze G., Radu S.M., Moraru R.I., Khokerashvili Z., Arudashvili N., (2019, B), FDS modeling of the piston effect in subway tunnels, Environmental Engineering and Management Journal, Vol. 18, No. 4, 317-325.
Lanchava O., (2019), Analysis of critical air velocity for tunnel fires controlled by ventilation, Mining Journal, 1(42), 126-132, Tbilisi (Georgian).
Lanchava O., Ilias N., (2020), Critical velocity analysis for safety management in case of tunnel fire, MATEC Web of Conferences 305, 00023. https://doi.org/10.1051/matecconf/202030500023
Lanchava O., Nozadze G., Jangidze M., (2021), A system of transformable barriers to localize fires and minimize life-threatening outcomes in road tunnels. Patent of Georgia, 15411. International index A 62 C 2/06.
Lanchava O., Ilias N., Radu S.M., Jangidze M., Khokerashvili Z., (2021), Fire development study on physical models of transport tunnels, MATEC Web of Conferences 342, 03020 (2021). https://doi.org/10.1051/matecconf/202134203020
Lanchava O., Javakhishvili G., (2021), Impact of strong fires on a road tunnel ventilation system, BULLETIN OF THE GEORGIAN NATIONAL ACADEMY OF SCIENCES, 15 (4), 38-45.
Lia J., Li Y.F., Cheng C.H., Chow W.K., (2019), A study on the effects of the slope on the critical velocity for longitudinal ventilation in tilted tunnels, Tunneling and Underground Space Technology, 89, 262-265.
Lei P., Chen Ch., Zhang Y., Xu T., H. Sun H., (2021), Experimental study on temperature profile in a branched tunnel fire under natural ventilation considering different fire locations, International Journal of Thermal Sciences, 159, 106631.
Li Y.Z., Lei B., Ingason H., (2010), Study of critical velocity and backlayering length in longitudinally ventilated tunnel fires, Fire Safety Journal, 45, 361-370.
Li Y.Z., Ingason H., (2017), Effect of cross section on critical velocity in longitudinally ventilated tunnel fires, Fire Safety Journal, 91, 303–311.
Li Y. Z., Ingason H., Jiang L., (2018), Influence of tunnel slope on smoke control, RISE Research Institutes of Sweden, 22.
Li Y.Z., Ingason H., (2018), Overview of research on fire safety in underground road and railway tunnels, Tunneling and Underground Space Technology, 81, 568–589.
Seitlinger G., (2002), Safety device in case of tunnel fires, German Patent, No. 10127091 A1, (German).
Tang F., Cao Z.L., Palacios A., Wang Q., (2018), A study on the maximum temperature of ceiling jet induced by rectangular-source fires in a tunnel using ceiling smoke extraction, International Journal of Thermal Sciences, 127, 329–334.
TRANS/AC 7/9, (2001), RECOMMENDATIONS OF THE GROUP OF EXPERTS ON SAFETY IN ROAD TUNNELS, Economic and Social Council, Multidisciplinary Group of Experts on Safety in Tunnels, On line at: https://unece.org/DAM/trans/doc/2002/ac7/TRANS-AC7-09e.pdf
TRANS/AC 7/11, (2002), REPORT OF THE AD HOC MULTIDISCIPLINARY GROUP OF EXPERTS ON SAFETY IN TUNNELS ON ITS FIFTH SESSION, Economic and Social Council, Multidisciplinary Group of Experts on Safety in Tunnels, On line at: https://unece.org/fileadmin/DAM/trans/doc/2002/ac7/TRANS-AC7-11e.pdf
Vantelon J.P. et al., (1991), Investigation of Fire-Induced Smoke Movement in Tunnels and Stations: An Application to the Paris Metro. In IAFSS Fire Safety Science-Proceedings of the third international symposium. Edinburg.
Vaitkevicius A., Carvel R., (2016), Investigating the Throttling Effect in Tunnel Fires, Fire Technology, 52, 1619–1628.
Vauquelin O., (2005), Parametrical study of the backflow occurrence in case of a buoyant release, Experimental Thermal and Fluid Science, 29, 725-731.
Vauquelin O., Telle D., (2005), Definition and experimental evaluation of the smoke "confinement velocity" in tunnel fires, Fire Safety Journal, 40, 320-330.
Wagner E.W., (2003), Method and device for extinguishing fires in tunnels, European Patent Office, No. EP 1312392 A1, (German).
Wan H., Gao Z., Han J., Ji J., Ye M., Zhang Y., (2019), A numerical study on smoke back-layering length and inlet air velocity of fires in an inclined tunnel under natural ventilation with a vertical shaft, International Journal of Thermal Sciences, 138, 293–303.
Weng M.C. et al., (2016), Study on the critical velocity in a sloping tunnel fire under longitudinal ventilation, Applied Thermal Engineering, 94, 422–434.
Yi L. et al., (2014), An experimental study on critical velocity in sloping tunnel with longitudinal ventilation under fire, Tunnelling and Underground Space Technology, 43, 198-203.
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