Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Evaluation of Mechanical Performance of a Segment Lining coated by a Sprayed Waterproofing Membrane by a Full-scale Loading Test

실물 재하실험에 의한 뿜칠 방수 멤브레인이 타설된 세그먼트 라이닝의 역학적 성능 평가

  • Kang, Tae-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Choi, Soon-Wook (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Chulho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Byungkwan (Smart City&Construction Engineering, University of Science and Technology (UST)) ;
  • Kim, Jintae (Taean Factory, Silkroad T&D Co., Ltd.) ;
  • Choi, Myung-Sik (Taean Factory, Silkroad T&D Co., Ltd.) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 강태호 (한국건설기술연구원 지반연구소) ;
  • 최순욱 (한국건설기술연구원 지반연구소) ;
  • 이철호 (한국건설기술연구원 지반연구소) ;
  • 박병관 (과학기술연합대학원대학교(UST) 스마트도시.건설융합전공) ;
  • 김진태 (실크로드티앤디 태안공장) ;
  • 최명식 (실크로드티앤디 태안공장) ;
  • 장수호 (한국건설기술연구원 지반연구소)
  • Received : 2018.01.31
  • Accepted : 2018.02.05
  • Published : 2018.02.28
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Abstract

The application of sprayed waterproofing membrane with high adhesion and ductility is considered to be promising as a measure for repair and reinforcement of a tunnel structure. Therefore, a powder-type and one-component membrane prototype with high tensile and bond strengths was made in this study. Then, its reinforcement effect on a shield segment was evaluated by carrying out a series of full-scale loading tests of segment specimens on which the membrane was sprayed. From the tests, it was confirmed that the initial cracking loads increased by approximately 34% due to cracking retardation by membrane coating. Even though the increase of failure loads were not so high as cracking loads, the strain-softening behaviors were observed from specimens coated by the membrane. Therefore, it is expected that the membrane coated on the inner surface of a lining might be effective in preventing its brittle failure.

뿜칠 방수 멤브레인이 가진 높은 부착력과 연성 특성으로 인해 터널 구조물의 보수 보강 목적으로 멤브레인을 적용하는 방안이 고려되고 있다. 따라서 본 연구에서는 인장강도와 부착강도가 향상된 분말 1성분 멤브레인 시제품을 제작하였고, 이를 실물 세그먼트의 내측에 타설하여 실물 실험체를 제작하고 실물 재하실험을 통해 멤브레인의 보강효과를 파악하고자 하였다. 실험결과, 멤브레인의 코팅으로 인해 세그먼트의 균열 발생이 지연되어 세그먼트의 초기 균열발생하중이 평균적으로 약 34% 증가하였다. 반면, 멤브레인 코팅에 의한 파괴하중의 증가율은 상대적으로 크지 않았다. 단, 멤브레인의 코팅으로 인해 파괴 하중 이후에 변형률 연화 현상이 관찰되어, 멤브레인으로 라이닝 내측을 코팅하게 될 경우에는 라이닝의 취성 파괴를 방지하는데 효과가 있을 것으로 추정된다.

Keywords

References

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