Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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An experimental study on bonding and bearing capacities of thin spray-on liner to evaluate its applicability as a tunnel support member

터널 지보재로서의 적용성 검토를 위한 박층 뿜칠 라이너의 부착성능과 지보성능의 평가

  • Han, Jin-Tae (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Gyu-Phil (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Park, Young-Taek (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Choi, Soon-Wook (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Hwang, Gwi-Sung (SILKROAD T&D) ;
  • Choi, Myung-Sik (SILKROAD T&D) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
  • 한진태 (한국건설기술연구원 SOC성능연구소 GEO-인프라연구실) ;
  • 이규필 (한국건설기술연구원 SOC성능연구소 GEO-인프라연구실) ;
  • 박영택 (한국건설기술연구원 SOC성능연구소 GEO-인프라연구실) ;
  • 최순욱 (한국건설기술연구원 SOC성능연구소 GEO-인프라연구실) ;
  • 황귀성 ((주)실크로드티앤디) ;
  • 최명식 ((주)실크로드티앤디) ;
  • 장수호 (한국건설기술연구원 SOC성능연구소 GEO-인프라연구실)
  • Received : 2013.10.23
  • Accepted : 2013.11.04
  • Published : 2013.11.30
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Abstract

The use of Thin Spray-on Liner (TSL) as an alternative to shotcrete has drastically increased since 1990s when it was first developed and introduced to mines. In this study, tensile strength test, bond strength test, compression test with specimens coated by TSL, and two kinds of bending tests proposed by EFNARC (2008) were performed with two kinds of TSLs with different material compositions in order to evaluate their support capacities. As a result, both TSLs were shown to be satisfactory for the minimum performance requirements for a structural rock support suggested by EFNARC (2008) and tensile strength of a TSL was shown to increase as its content of polymer was higher. In contrast, its bond strength was shown to increase proportional to the content of a cementitious component especially at the early age.

박층 뿜칠 라이너(Thin Spray-on Liner, TSL)는 1990년대에 개발되어 광산에 처음 적용된 이후로 숏크리트의 대체 재료로서의 활용이 증가하고 있다. 본 연구에서는 폴리머 함량이 다른 두 가지 TSL 재료에 대하여 인장강도시험, 부착강도시험, TSL 코팅 시험편에 대한 압축강도시험 및 EFNARC(2008)에서 제안한 TSL의 지지 성능평가 시험을 수행하여 지보재로서 사용하기 위한 TSL의 역학적 성능을 평가하였다. 실험결과, 본 연구에서 사용된 두 가지 재료 모두 지보재로서의 최소 성능 규정은 만족하는 것으로 나타났으며, 특히, 폴리머 성분이 높을수록 인장강도가 증가하는 반면, 시멘트계 성분이 높을수록 상대적으로 초기 재령에서 부착강도가 크게 나타남을 실험적으로 확인하였다.

Keywords

References

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