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2020 Vol.30, Issue 3 Preview Page

Research Article

Numerical modelling of coupled thermo-hydro-mechanical behavior of Heater Experiment–D (HE-D) at Mont Terri rock laboratory in Switzerland

스위스 Mont Terri rock laboratory에서 수행된 암반 히터시험(HE-D)에 대한 열-수리-역학적 복합거동 수치해석

Changsoo Lee1*
,
Heui-Joo Choi2
,
Geon-Young Kim2
이 창수1*
,
최 희주2
,
김 건영2
1Senior Researcher, Korea Atomic Energy Research Institute
2Principal Researcher, Korea Atomic Energy Research Institute
1한국원자력연구원 선임연구원
2한국원자력연구원 책임연구원
* Corresponding Author
30 June 2020. pp. 242-255
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Abstract

The numerical simulations of Heater Experiment-D (HE-D) at the Mont Terri rock laboratory in Switzerland were performed to investigate an applicability of FLAC3D to reproduce the coupled thermo-hydro-mechanical (THM) behaviour in Opalinus Clay, as part of the DECOVLEX-2015 project Task B. To investigate the reliability of numerical simulations of the coupled behaviour using FLAC3D code, the simulation results were compared with the observations from the in-situ experiment, such as temperature at 16 sensors, pore pressure at 6 sensors, and strain at 22 measurement points. An anisotropic heat conduction model, fluid flow model, and transversely isotropic elastic model in FLAC3D successfully represented the coupled thermo-hydraulic behaviour in terms of evolution for temperature and pore pressure, however, performance of the models for mechanical behavior is not satisfactory compared with the measured strain.

Keywords
Thermo-hydro-mechanical coupled behavior
HE-D in-situ test
Opalinus Clay
Anisotropy
FLAC3D

본 연구에서는 FLAC3D가 Opalinus Clay 암반의 열-수리-역학적 복합거동을 재현하고 이를 예측할 수 있는지 그 적용성을 검토하고자 국제공동연구 DECOVALEX-2015에서 참여하였으며, 그 일환으로 스위스 Mont Terri Rock Laboratory에서 수행된 Heater Experiment-D (HE-D)에 대한 모델링을 수행하였다. FLAC3D를 이용한 수치해석의 타당성을 평가하기 위해 현장시험에서 계측된 16 지점의 온도, 6 지점의 공극수압, 그리고 22 지점의 변형률 데이터와 비교하였다. 대상 암반의 열-수리-역학적인 이방성을 고려함으로써 Opalinus Clay 암반의 온도 변화 그리고 온도변화에 따른 공극수압의 변화와 같은 열-수리적 거동은 전반적으로 유사하게 나타났으나, 역학적 거동의 경우 변형률 데이터를 비교했을 때 온도와 공극수압과는 달리 계산된 변형률 일부만이 유사한 거동을 보였다.

키워드
열-수리-역학적 복합거동
HE-D 현장시험
Opalinus Clay
이방성
FLAC3D
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 30
  • No :3
  • Pages :242-255
  • Received Date : 2020-06-11
  • Revised Date : 2020-06-24
  • Accepted Date : 2020-06-25
  • DOI :https://doi.org/10.7474/TUS.2020.30.3.242
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