Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Performance Evaluation of OGS-FLAC Simulator for Coupled Thermal-Hydrological-Mechanical Analysis

열-수리-역학적 연계해석을 위한 OGS-FLAC 시뮬레이터의 성능 평가

  • Park, Dohyun (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Chan-Hee (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 박도현 (한국지질자원연구원 심층처분환경연구센터) ;
  • 박찬희 (한국지질자원연구원 심층처분환경연구센터)
  • Received : 2022.04.04
  • Accepted : 2022.04.22
  • Published : 2022.04.30
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Abstract

The present study developed a sequential approach-based numerical simulator for modeling coupled thermal-hydrological-mechanical (THM) processes in the ground and investigated the computational performance of the coupling analysis algorithm. The present sequential approach linked the two different solvers: an open-source numerical code, OpenGeoSys for solving the thermal and hydrological processes in porous media and a commercial code, FLAC3D for solving the geomechanical response of the ground. A benchmark test of the developed simulator was carried out using a THM problem where an analytical solution is given. The benchmark problem involves the coupled behavior (variations in temperature, pore pressure, stress, and deformation with time) of a fully saturated porous medium which is subject to a point heat source. The results of the analytical solution and numerical simulation were compared and the validity of the numerical simulator was investigated.

본 연구에서는 지반의 열-수리-역학적 복합거동을 모델링하기 위한 순차적 접근법 기반의 시뮬레이터를 개발하고 적용된 연계해석 알고리즘의 계산성능을 분석하였다. 본 연구의 순차적 연계해석에서는 다공성 매질의 열 및 유체거동 분석을 위한 오픈소스 기반의 OpenGeoSys 수치코드와 역학해석을 위한 상용 소프트웨어 FLAC3D가 연동되었다. 해석해가 주어진 열-수리-역학적 복합거동 문제를 토대로 개발된 시뮬레이터에 대한 벤치마크 테스트가 수행되었다. 적용된 벤치마크 문제는 완전포화된 지반 내 점열원 작용 시 지반거동(시간에 따른 온도, 간극수압, 응력, 변형 변화)과 관계된다. 해석해와 수치해석 시뮬레이션 결과를 비교 분석하고 연계해석 시뮬레이터의 적정성을 조사하였다.

Keywords

Acknowledgement

본 연구는 한국지질자원연구원의 기본사업인 '심지층 개발과 활용을 위한 지하심부 특성평가 기술개발(과제코드 GP2020-010)'의 일환으로 수행되었습니다.

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