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Retraction: A numerical study on the fire smoke behavior by operating the fire prevention system in tunnel-type structure

논문 취소: 터널형 구조물의 방재시설 가동에 따른 화재연기 거동에 관한 수치 해석적 연구

  • Received : 2018.12.04
  • Accepted : 2018.12.28
  • Published : 2019.01.31

Abstract

In this study, behaviors of fire smoke in the operation of disaster prevention facilities (smoke damper, jet fan) in a tunnel-type structure (soundproof tunnel) were investigated numerically and results of the investigation were compared and analyzed. Through the simulation and analysis, it was found that there was a significant change in the patterns of fire smoke between the opening of the ceiling of a fire vehicle and the closing, and it was shown that the critical temperatures of PC and PMMA, main materials of a soundproof tunnel were not exceeded. In addition, the simulation of installation intervals of smoke dampers showed that the maximum temperature of a soundproof tunnel without smoke dampers was $552^{\circ}C$ while it reached $405^{\circ}C$ when smoke dampers were installed at the installation interval of 50 m. The simulation of the operation of a jet fan showed that the maximum temperature of a soundproof tunnel without a jet fan was $549^{\circ}C$ while it reached only $86^{\circ}C$ when a jet fan was operating. Therefore, it is highly expected that they could create a favorable environment for evacuation and protection of soundproofing materials, and it would be necessary to promote basic studies on tunnels serving various functions and purposes.

본 연구에서는 배연댐퍼 또는 제트팬과 같은 방재시설이 설치된 터널형 구조물(방음터널)에 대하여 방재시설 가동에 따른 화재연기의 거동을 수치해석적으로 고찰하고 해석결과를 비교 검토하여 다음과 같은 결론을 얻었다. 화재차량 천장부 개방 유무에 따라 방음터널 내 화재양상이 확연하게 달라지는 것을 확인하였으며, 방음터널의 주요 자재인 PC와 PMMA의 임계온도를 초과하지 않는 것으로 나타났다. 또한 배연댐퍼의 설치간격에 따른 해석결과, 방음터널 내 발생하는 최대 온도가 미설치시에는 최대 $552^{\circ}C$인 반면, 설치간격이 50 m인 경우에는 $405^{\circ}C$로 나타났으며, 제트팬 가동 여부에 따른 해석결과, 방음터널 내 발생하는 최대 온도는 제트팬 미가동시에는 $549^{\circ}C$인 반면, 가동시에는 $86^{\circ}C$로 나타나 화재시 피난환경과 방음자재보호에 있어 매우 유리한 환경을 조성할 것으로 예상되며, 향후 다양한 목적을 가진 터널을 대상으로도 이러한 기초연구의 활성화가 필요할 것으로 사료된다.

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Fig. 1. Grade distribution of expressway tunnels and soundproof tunnels

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Fig. 2. Simulation case domain

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Fig. 3. Temperature distribution by opening the ceiling to material

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Fig. 4. Results of simulation - Effect of opening of the ceiling of a soundproof tunnels

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Fig. 5. Results of simulation - Effect of exhaust damper installation

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Fig. 6. Results of simulation - Effect of exhaust damper installation

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Fig. 7. Results of simulation - Effect of smoke control system (jet-fan) operation

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Fig. 8. Temperature distribution to smoke control system (jet-fan) operation

Table 1. Grade distribution of expressway tunnels and soundproof tunnels

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Table 2. Boundary condition

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Table 3. Simulation case

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Table 4. Maximum diffusion distance of CO

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Acknowledgement

Grant : 대심도 복층터널 설계 및 시공 기술개발

Supported by : 국토교통과학기술진흥원

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