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2026 Vol.3, Issue 2 Preview Page

Research Article

Verification of Applicability of a Sandwich Panel-Type Universal Liner Using High-Performance TWIP Steel Plate for Tunnel Protection Technology under Extreme Loadings

고성능 TWIP 강판을 적용한 샌드위치 패널형 유니버설 라이너의 터널 극한하중 방호 기술 적용성 평가

Myung-Hyun Noh1
,
Jum-Sik Chae2*
노 명현1
,
채 점식2*
1Senior Researcher, Solution R&D Center, Technical Research Laboratories, Incheon, 21985, Rep. of Korea
2Audit Division, Jung-Gu District Office, Seoul Metropolitan Government, Seoul, 04558, Rep. of Korea
1포스코 솔루션연구소 수석연구원
2서울특별시 중구청 감사담당관
*Corresponding Author
30 April 2026. pp. 100-110
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Abstract

This study evaluated the applicability of a sandwich panel-type universal liner using high-strength and high-ductility TWIP980 (Twinning Induced Plasticity, tensile strength ≥ 980 MPa) steel plate and a nano-composite core for tunnel protection under extreme loading conditions, including blast, fire, and earthquake. Numerical analyses were conducted to simulate internal blast, heat transfer, and seismic ovaling behaviors. The blast analysis revealed that the TWIP980 steel plate-based liner effectively absorbed and dissipated impact energy, limiting the maximum effective plastic strain to approximately 0.006 under a 2,268.0-kg TNT equivalent blast. The fire analysis demonstrated that the nano-composite core significantly delayed heat transfer, restricting the concrete surface temperature to 42.4 ℃ under a 150-MW fire scenario. The seismic analysis indicated that the application of the universal liner reduced the axial and shear forces on the existing concrete lining by 24.0 %, despite a slight increase in the bending moment. These findings verify that the proposed universal liner can serve as an effective integrated protective system for enhancing tunnel safety under multi-hazard conditions.

Keywords
tunnel protection
universal liner
TWIP980 steel plate
nano-composite core
extreme loading

본 연구에서는 고강도·고연성 강재인 TWIP980강판과 나노 복합 코어재를 적용한 샌드위치 패널형 유니버설 라이너의 터널 방호 기술 적용성을 평가하였다. 이를 위해 내부 폭발, 화재에 의한 열전달, 지진 발생 시의 단면 타원형 거동 조건에 대한 수치해석이 수행되었다. 해석 결과, 첫째, 폭발해석에서 TWIP980 강판 기반 라이너는 TNT 2,268.0 kg 상당의 폭발하중 하에서도 최대 유효 소성변형률을 약 0.006 수준으로 제한하며 우수한 에너지 흡수 성능을 나타냈다. 둘째, 화재해석 결과, 나노 복합 코어재가 열전달을 효과적으로 지연시켜 150 MW 규모의 화재 조건에서도 기존 콘크리트 표면 온도를 42.4 ℃ 이내로 유지하였다. 셋째, 지진해석 결과, 유니버설 라이너 적용 시 기존 콘크리트 라이닝에 작용하는 축력과 전단력이 약 24.0 % 감소하였으나 모멘트는 소폭 증가하는 것으로 확인되었다. 따라서 제안된 유니버설 라이너는 폭발, 화재, 지진과 같은 극한 하중에 대한 복합 방호 성능을 향상시킬 수 있는 통합형 터널 방호 시스템으로 활용될 수 있을 것으로 판단된다.

키워드
터널 방호
유니버설 라이너
TWIP980 강판
나노 복합 코어재
극한하중
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Information
  • Publisher :Korea Protective Facility Institute
  • Publisher(Ko) :한국방호시설학회
  • Journal Title :Protective Facility
  • Journal Title(Ko) :방호시설
  • Volume : 3
  • No :2
  • Pages :100-110
  • Received Date : 2026-03-11
  • Revised Date : 2026-04-21
  • Accepted Date : 2026-04-23
  • DOI :https://doi.org/10.23310/PF.2026.3.2.100
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