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A study on the fire smoke diffusion delay strategy in a great depth underground double deck tunnel junction

대심도 복층터널 교차로 화재연기 확산지연 방안 연구

  • Received : 2018.11.26
  • Accepted : 2018.12.07
  • Published : 2019.01.31

Abstract

Recently, in order to solve the traffic congestion in urban areas and to improve the peripheral environment, research on the design and construction technology development of great depth underground double-deck tunnel is under way by using the underground space in the urban area. The network type double-deck tunnel is in the form of an intersection with a small cross section and a steep slope as per construction at the base of a flatland, so that the fire smoke spreads rapidly in case of fire, which is expected to cause damage of human life. Therefore, this study is analyzed the delay effect of fire smoke diffusion according to the installation and non - installation of delay system for fire smoke diffusion at the intersection. Fire fumes were delayed up to 270 seconds when the delay system for fire smoke diffusion was installed at the intersection and it is analyzed that the greater the operating area of the delay system for fire smoke diffusion, the more preventable the damage of human life of the intersection.

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Fig. 1. Scenarios for the analysis

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Fig. 2. Tunnel cross section

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Fig. 3. Junction cross section

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Fig. 4. Modeling of fire

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Fig. 5. View of modeling

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Fig. 6. Fire growth curve

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Fig. 7. Carbon monoxide growth curve

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Fig. 8. Blocking rate 0% - CO

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Fig. 9. Blocking rate 50% - CO

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Fig. 10. Fire smoke distance over time

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Fig. 11. Temperature over time

Table 1. Scenarios for the analysis

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Table 2. Tunnel specification

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Table 3. Junction specification

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Table 4. Design fire strength and smoke generation

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Table 5. Car body standard

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Table 6. Input conditions

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Table 7. Fire growth rate

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Table 8. Analysis result

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Acknowledgement

Grant : 대심도 복층터널 설계 및 시공 기술개발

Supported by : 국토교통과학기술진흥원

References

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