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Research Paper

A study on freeze-thaw evaluation criteria for road tunnels considering climate characteristics

국내 기후특성을 고려한 도로터널의 동결-융해 평가기준 연구

Joon-Shik Moon1
,
Jai-Wook An2*
,
Hong-Kyoon Kim3
,
Jong-Gun Lee4
문 준식1
,
안 재욱2*
,
김 홍균3
,
이 종건4
1Associate Professor, Dept. of Civil Engineering, Kyungpook National University
2Manager, Dept. of Ground Safety, KISTEC
3General Manager, Dept. of Ground Safety, KISTEC
4General Manager, Dept. of Ground Safety, KISTEC
1정회원, 경북대학교 토목공학과 교수
2비회원, 한국시설안전공단 지반안전실 과장
3정회원, 한국시설안전공단 지반안전실 부장
4비회원, 한국시설안전공단 지반안전실 부장
* Corresponding Author
31 January 2020. pp. 121-133
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Abstract

Globally, the frequency and intensity of abnormal climate events are increasing. Since this can directly damage lives and property, it is important to establish and implement an appropriate maintenance strategy in response to abnormal weather. Facilities built in cold regions where cold wave or heavy snow occurs frequently can be more damaged by freeze-thaw than facilities located in other regions. However, there are no clear criteria for quantitatively identifying the damage of freeze-thaw and how to cope with it. Therefore, based on the results of indoor freezing tests, the freezing conditions considering regional climate characteristics were selected as one day at -14°C, two days at -7°C or three days at -5°C. As a result, it was confirmed that they were in the freeze-thaw environment in order of Daegwallyeing (8.3 times), Cheorwon (5.3 times) and Taebeak (4.9 times) in Gangwon region. Through this study, the evaluation criteria of freeze-thaw of road tunnels were newly proposed. The freeze-thaw evaluation criteria of the road tunnel presented in this study can be used for the quantitative evaluation and maintenance strategy of tunnels in cold regions.

Keywords
Freeze-thawing criteria
Cold regions
Heat transfer quantity analysis
Indoor freeze test

전 세계적으로 이상기후 현상의 빈도와 강도는 높아지고 있는 추세이다. 이는 인명과 재산에 직접적인 피해를 줄 수 있으므로 이상기후에 대응하여 적정한 유지관리 전략을 수립하고 실천하는 것이 중요하다. 한파 또는 폭설이 빈번하게 발생하는 한랭지역에 건설되는 시설물의 경우에는 다른 지역에 위치하고 있는 시설물에 비하여 동결-융해에 의한 피해를 많이 받을 수 있으며, 해를 거듭할수록 그 피해 정도는 증가할 가능성이 매우 높다. 그러나 동결-융해의 피해를 정량적으로 확인할 수 있는 명확한 기준과 이에 대한 대응방안은 아직 제시되고 있지 않은 실정이다. 따라서 실내 동결시험 결과를 기반으로 지역별 기후특성을 고려한 동결조건을 -14°C에서 1일, -7°C에서 2일 또는 -5°C에서 3일 지속될 경우로 선정하였으며, 그 결과, 강원지역의 대관령(8.3회), 철원(5.3회), 태백(4.9회)의 순으로 동결-융해 환경에 노출되어 있는 것으로 판단되었다. 이러한 연구결과를 기반으로 도로터널의 동결-융해 평가기준을 새롭게 제시하였다. 본 연구에서 제시된 도로터널의 동결-융해 평가기준은 추후 한랭지역 터널의 정량적 평가와 유지관리 전략의 수립 시 활용될 수 있을 것으로 판단된다.

키워드
동결-융해 평가기준
한랭지역
열류량 분석
실내 동결시험
References
1
An, J.W., Seo, J.E., Jung, M.H., Seong, J.H. (2018), “Classification of cold regions and analysis of the freeze-thaw repetition cycle based on heat transfer quantity by freezing test”, Journal of Korean Tunnelling and Underground Space Association, Vol. 20, No. 6, pp. 957-972.
2
Cheong, H.M. (2013), “Degree of damage risk by freeze and thaw of concrete structures in Korea”, Proceedings of the 2013 Spring Conference on Korea Concrete Institute Conference, Yeosu, Vol. 25, No. 1, pp. 89-90.
3
FHWA (1996), Recommended HPC grade for given exposure condition, Federal Highway Administration.
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Jin, H.W., Hwang, Y.C. (2017), “Experimental study on internal temperature change induced by heating element attached to tunnel ling surface”, Journal of the Korean Geo-Environmental Society, Vol. 18, No. 11, pp. 35-40.
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Midas IT (2013), Understanding and using practical finite element analysis, pp. 2-3.
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MOLIT (2018), Detailed guidelines for the safety and maintenance of facilities (performance evaluation), Ministry of Land, Infrastructure and Transport, pp. 2-52.
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Park, K.H., An, J.W., Park, S.H., Yoon, T.G. (2017), “A study on the development of maintenance system for tunnel with freezing-thawing damage”, Geotechnical Hazard Mitigations: Experiment, Theory and Practice-Proceedings of the 5th International Conference on Geotechnical Engineering for Disaster Mitigation and Rehabilitation, Taipei, pp. 121-135.
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 22
  • No :1
  • Pages :121-133
  • Received Date : 2019-12-18
  • Revised Date : 2020-01-07
  • Accepted Date : 2020-01-10
  • DOI :https://doi.org/10.9711/KTAJ.2020.22.1.121
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