[논문]임계응력 하 거친 암석 균열의 Thermoshearing 수치모델링: 국제공동연구 DECOVALEX-2023 Task G

박정욱; 박찬희; 장리; 윤정석; 손장윤; 이창수

doi:10.7474/tus.2023.33.3.189

임계응력 하 거친 암석 균열의 Thermoshearing 수치모델링: 국제공동연구 DECOVALEX-2023 Task G
Numerical Modeling of Thermoshearing in Critically Stressed Rough Rock Fracture: DECOVALEX-2023 Task G 원문보기

터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, v.33 no.3, 2023년, pp.189 - 207

박정욱 (한국지질자원연구원) , 박찬희 (한국지질자원연구원) , 장리 (한국건설기술연구원) , 윤정석 , 손장윤 (과학기술연합대학원대학교) , 이창수 (한국원자력연구원)

Abstract ▼ AI-Helper

In the present study, the thermoshearing experiment on a rough rock fracture were modeled using a three-dimensional grain-based distinct element model (GBDEM). The experiment was conducted by the Korea Institute of Construction Technology to investigate the progressive shear failure of fracture under the influence of thermal stress in a critical stress state. The numerical model employs an assembly of multiple polyhedral grains and their interfaces to represent the rock sample, and calculates the coupled thermo-mechanical behavior of the grains (blocks) and the interfaces (contacts) using 3DEC, a DEM code. The primary focus was on simulating the temperature evolution, generation of thermal stress, and shear and normal displacements of the fracture. Two fracture models, namely the mated fracture model and the unmated fracture model, were constructed based on the degree of surface matedness, and their respective behaviors were compared and analyzed. By leveraging the advantage of the DEM, the contact area between the fracture surfaces was continuously monitored during the simulation, enabling an examination of its influence on shear behavior. The numerical results demonstrated distinct differences depending on the degree of the surface matedness at the initial stage. In the mated fracture model, where the surfaces were in almost full contact, the characteristic stages of peak stress and residual stress commonly observed in shear behavior of natural rock joints were reasonably replicated, despite exhibiting discrepancies with the experimental results. The analysis of contact area variation over time confirmed that our numerical model effectively simulated the abrupt normal dilation and shear slip, stress softening phenomenon, and transition to the residual state that occur during the peak stress stage. The unmated fracture model, which closely resembled the experimental specimen, showed qualitative agreement with the experimental observations, including heat transfer characteristics, the progressive shear failure process induced by heating, and the increase in thermal stress. However, there were some mismatches between the numerical and experimental results regarding the onset of fracture slip and the magnitudes of fracture stress and displacement. This research was conducted as part of DECOVALEX-2023 Task G, and we expect the numerical model to be enhanced through continued collaboration with other research teams and validated in further studies.

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표/그림 (19)

표 Table 1. Task G modeling teams and approaches
$Fig. 1. Test specimen: unmated tensile-splitting fracture in Pocheon granite (Zhuang et al., 2022)$ 그림 Fig. 1. Test specimen: unmated tensile-splitting fracture in Pocheon granite (Zhuang et al., 2022)
$Table 2. Physical and mechanical properties of rock and fracture (Sun et al., 2022)$ 표 Table 2. Physical and mechanical properties of rock and fracture (Sun et al., 2022)
그림 Fig. 2. Boundary conditions during mechanical loading test and thermo-mechanical loading test (modified from source: Sun et al., 2022)
$Fig. 3. Schematic diagram showing the locations of heaters, sensors, and gauges on the six sides of the cubic granite specimen with a single fracture (Sun et al., 2022)$ 그림 Fig. 3. Schematic diagram showing the locations of heaters, sensors, and gauges on the six sides of the cubic granite specimen with a single fracture (Sun et al., 2022)
그림 Fig. 4. Temperature distributions and revolutions at six measuring points during thermoshearing test (modified from source: Sun et al., 2022)
$Fig. 5. Maximum principal stress increment and fracture shear and normal displacements (Zhuang et al., 2022)$ 그림 Fig. 5. Maximum principal stress increment and fracture shear and normal displacements (Zhuang et al., 2022)
그림 Fig. 6. Fracture shear displacements during the thermoshearing measured by the clip-on displacement transducer and the DIC technique (Zhuang et al., 2022)
그림 Fig. 7. Fracture surface profile colormap with projection
$Fig. 8. Grain-based model for simulating thermo-mechanical test on rough fracture: (a) experimental specimen (modified from source: Zhuang et al., 2022), (b) unmated fracture (UF) model and (c) mated fracture (MF) model$ 그림 Fig. 8. Grain-based model for simulating thermo-mechanical test on rough fracture: (a) experimental specimen (modified from source: Zhuang et al., 2022), (b) unmated fracture (UF) model and (c) mated fracture (MF) model
표 Table 3. Calibrated input parameters, and results of numerical uniaxial compressive strength test and linear thermal expansion test (Park et al., 2022)
그림 Fig. 9. Thermal boundary condition applied to numerical model for simulating thermoshearing test (modified from source: Zhuang et al., 2022)
표 Table 3. Calibrated input parameters, and results of numerical uniaxial compressive strength test and linear thermal expansion test (Park et al., 2022) (continued)
그림 Fig. 10. Comparison of experimental and numerical results of surface temperatures at measuring points T1, T2, T3 and T6
그림 Fig. 11. Temperature distribution and contact area calculated at 6,000 seconds of heating; the red triangle denotes the interface in contact state
$Fig. 12. Results of mated fracture model: temperature distribution and contact area calculated at 1570, 1590 and 3000 seconds of heating; the red triangle denotes the interface in contact state$ 그림 Fig. 12. Results of mated fracture model: temperature distribution and contact area calculated at 1570, 1590 and 3000 seconds of heating; the red triangle denotes the interface in contact state
그림 Fig. 13. Comparison of experimental and numerical results of maximum principal stress increment
$Fig. 14. Comparison of experimental and numerical results of fracture normal displacement$ 그림 Fig. 14. Comparison of experimental and numerical results of fracture normal displacement
$Fig. 15. Comparison of experimental and numerical results of fracture shear displacement$ 그림 Fig. 15. Comparison of experimental and numerical results of fracture shear displacement

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