터널과지하공간 (Tunnel and Underground Space)

  • 제31권6호
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  • Pages.469-479
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  • 2021
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
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세그먼트 라이닝의 PP섬유 혼입량과 공기량 변화에 따른 화재저항 특성 평가

Evaluation of Segment Lining Fire Resistance Based on PP Fiber Dosage and Air Contents

  • 최순욱 (한국건설기술연구원 지반연구본부) ;
  • 강태성 ((주)인터컨스텍)
  • Choi, Soon-Wook (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Kang, Tae Sung (Business Department, INTERCONSTECH)
  • 투고 : 2021.11.03
  • 심사 : 2021.11.22
  • 발행 : 2021.12.31
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초록

콘크리트의 폭렬방지 재료로서 PP섬유는 그 효과가 이미 확인되었다. 그러나 화재 시 발생하는 최대온도에 대한 고려가 필요하고 배합량에 따라 발생하는 믹싱문제 및 강도저하 문제의 해결이 필요하다. 본 연구에서는 RABT화재시나리오 하에서 PP섬유 함유량과 공기량에 따른 터널 세그먼트 라이닝의 화재저항성능을 살펴보았다. 그 결과, 모든 시험체에서 폭렬과 단면손실은 발생하지 않았으며, PP섬유 함유량이 작을 경우 상대적으로 최대온도가 높고 최대온도 도달시간 역시 빠른 것으로 나타났다. 반면, 공기량 차이에 따른 최대온도와 도달시간에 대한 어떤 경향을 발견하지 못했다. PP섬유 혼입량 0.75, 1.0, 1.5, 2.0 kg/m3인 경우에 대한 시험체 내부 온도분포 결과에서는 0.75와 1.0 kg/m3의 결과가 유사한 온도분포를 보였으며, 1.5와 2.0 kg/m3의 결과가 유사하게 나타났다. PP섬유 혼입량이 많을 경우 동일 깊이에서 내부 온도분포가 낮아지는 경향이 있는 것을 확인할 수 있었으며, PP섬유 혼입량 1.0 kg/m3와 1.5kg/m3의 결과에서 주목할 만한 차이가 발생함을 확인하였다.

As a material for preventing spalling of concrete, the effectiveness of PP fiber has already been confirmed. However, it is necessary to consider the maximum temperature that occurs during a fire, and to solve the mixing problem and the strength reduction problem that occur depending on the mixing amount. In this study, the fire resistance performance of tunnel segment linings according to the PP fiber content and air volume under the RABT fire scenario was investigated. As a result, no spalling or cross-sectional loss occurred in all test specimens, and when the PP fiber content was small, the maximum temperature was relatively high and the maximum temperature arrival time was also fast. On the other hand, no trend was found for the maximum temperature and arrival time according to the difference in air volume. In the internal temperature distribution results for the PP fiber mixing amount of 0.75, 1.0, 1.5, and 2.0 kg/m3, the results of 0.75 and 1.0 kg/m3 showed similar temperature distribution, and the results of 1.5 and 2.0 kg/m3 were similar. It was confirmed that the internal temperature distribution tends to decrease at the same depth when the amount of PP fiber mixed is large, and it was confirmed that a remarkable difference occurred from the results of 1.0 kg/m3 and 1.5 kg/m3 of PP fiber mixed amounts.

키워드

과제정보

본 연구는 한국건설기술연구원 민간수탁사업 "2019년 지반설계 정수산정 및 분석사업" 중 (주)인터컨스텍의 "세그먼트 RABT 화재시험 및 실대형시험"의 지원으로 수행되었습니다.

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