한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제38권9호
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  • Pages.45-52
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  • 2022
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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열-수리-역학 거동 해석을 위한 경계면 요소의 수식화

Numerical Formulation of Thermo-Hydro-Mechanical Interface Element

  • 신호성 (울산대학교 건설환경공학부) ;
  • 윤석 (한국원자력연구원 저장처분기술관리부)
  • Shin, Hosung (Dept. of Civil & Environmental Engrg., Univ. of Ulsan) ;
  • Yoon, Seok (Disposal Safety Evaluation Research Division, KAERI)
  • 투고 : 2022.08.05
  • 심사 : 2022.08.15
  • 발행 : 2022.09.30
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⟨ 이전 논문 다음 논문 ⟩

초록

암반내 불연속면이나 지반-구조물의 접촉면은 열-수리-역학적으로 연계된 거동 특성을 보이므로, 온전한 지배방정식에 근거한 경계면 요소의 개발이 필요하다. 본 논문은 경계면 요소에 대한 힘평형 방정식, 유체의 연속방정식 그리고 에너지 평형 방정식을 유도하였다. 그리고 경계면 요소에 대한 탄소성 역학 모델의 강성행렬을 제시하였다. 개발된 유한요소는 2차원 조건에서 변위는 6절점, 수압과 온도는 4절점을 사용한다. 단층내 유체 주입에 대한 완전연계된 THM 해석은 단층내의 유효응력 감소와 주위 암반의 온도 수축에 의한 주입압의 복합적인 변화을 모델링 할수 있었다. 하지만, 열적 현상을 무시한 HM해석은 수리-역학적 변수를 과다하게 산정하였다.

Because discontinuity in the rock mass and contact of soil-structure interaction exhibits coupled thermal-hydromechanical (THM) behavior, it is necessary to develop an interface element based on the full governing equations. In this study, we derive force equilibrium, fluid continuity, and energy equilibrium equations for the interface element. Additionally, we present a stiffness matrix of the elastoplastic mechanical model for the interface element. The developed interface element uses six nodes for displacement and four nodes for water pressure and temperature in a two-dimensional analysis. The fully coupled THM analysis for fluid injection into a fault can model the complicated evolution of injection pressure due to decreasing effective stress in the fault and thermal contraction of the surrounding rock mass. However, the result of hydromechanical analysis ignoring thermal phenomena overestimates hydromechanical variables.

키워드

과제정보

본 연구는 한국수력원자력(주) 해오름동맹출연사업(원전지역 특화연구)과 한국연구재단 중견연구자지원사업 (NRF-2022R1A2C200823611)의 지원으로 수행되었으며, 이에 깊은 감사를 드립니다.

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