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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Numerical study on contact behavior of TSL (Thin Spray-on Liner)

접촉 거동을 고려한 TSL(Thin Spray-on Liner)의 수치해석 연구

  • Lee, Chulho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Kicheol (Dept. of Civil and Environment Engineering, Incheon National University) ;
  • Kim, Dongwook (Dept. of Civil and Environment Engineering, Incheon National University)
  • 이철호 (한국건설기술연구원 지반연구소) ;
  • 장수호 (한국건설기술연구원 지반연구소) ;
  • 이기철 (인천대학교 건설환경공학과) ;
  • 김동욱 (인천대학교 건설환경공학과)
  • Received : 2015.10.27
  • Accepted : 2015.11.13
  • Published : 2015.11.30
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Abstract

A TSL (Thin Spray-on Liner) which consists of polymers has a higher initial strength, faster construction time and higher waterproofing performance than the conventional cementitious shotcrete. Main supporting mechanism of TSL is the adhesion and tensile strength which is distinct from the conventional shotcrete. Even though highly in demand due to its outstanding characteristics, TSL is not yet well-known support material. In this study, to evaluate contact behavior of TSL, numerical analysis was performed with comparing result from laboratory tests. From the analysis, cohesive behavior at the contact surface between TSL and rock can be evaluated by using combination of cohesive and the damage model. In addition, results show that the cohesive stiffness controled slope between force and displacement, the fracture energy controled level of force at the contact.

TSL(Thin Spray-on Liner)는 폴리머로 구성된 재료로 기존 시멘트계 숏크리트에 비해 높은 조기 강도와 시공성, 방수기능이 특징이다. TSL이 숏크리트에 비해 가장 큰 차이점은 재료의 인장력과 점착력으로 하중을 지지하는 것이다. 최근 TSL의 우수한 특성으로 인해 TSL에 대한 수요가 늘어나고 있으나 아직까지 국내에 TSL의 재료적 특성이나 평가방법이 잘 알려지지 않았다. 본 연구에서는 TSL의 특성 중 접촉면의 거동을 실내시험과 수치해석 방법을 사용하여 분석하였다. 해석결과 TSL과 암석 모델 사이의 접촉면에 점착모델과 손상 기준을 함께 적용하여 TSL의 접촉 거동을 적절히 모사할 수 있었다. 또한 접촉면의 강성이 TSL 접촉면의 초기 하중-변위 관계를 설명하여 손상 에너지가 접촉면의 수렴 수준을 결정하였다.

Keywords

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