[논문]암반 내 불연속면의 장기 전단 거동 평가를 위한 고찰

임주휘; 권새하; 최승범; 김태현; 민기복

doi:10.7474/tus.2023.33.1.010

암반 내 불연속면의 장기 전단 거동 평가를 위한 고찰
Case Studies on the Experiments for Long-Term Shear Behavior of Rock Discontinuities 원문보기

터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, v.33 no.1, 2023년, pp.10 - 28

임주휘 (서울대학교 에너지신산업 혁신공유대학사업단) , 권새하 (한국원자력연구원) , 최승범 (한국원자력연구원) , 김태현 (한국원자력연구원) , 민기복 (서울대학교 에너지자원공학과)

초록
AI-Helper

고준위방사성폐기물 처분장의 장기 안정성을 확보하기 위해서 암반 불연속면의 장기적인 전단 거동을 분석하고 그 안정성을 평가해야 한다. 암반 불연속면의 장기 전단 거동은 크리프 모델, RSF 모델로 모사될 수 있고, 전단 크리프 시험, 속도 단계 시험, 슬라이드-홀드-슬라이드 시험을 통해 모델에 필요한 파라미터를 결정하거나 여러 조건에서 전단 거동을 분석하는 실험을 수행할 수 있다. 기존 연구에 따르면 전단 실험을 위하여 직접전단시험기, 삼축압축시험기, 이축전단시험기가 주로 이용되었으며 현지 암반의 열-수리-역학적인 조건을 재현하기 위해 다양하게 개선된 장비가 이용되었고 그에 따라 다양한 양상의 전단 거동이 관찰되었다. 그러므로 국내 고준위방사성폐기물 처분장을 설계하기 위해서 처분장 부지의 암종, 열-수리-역학적 조건, 광물의 변성, 그리고 전단 저항의 회복 등을 고려하여 암반 불연속면의 장기 거동을 검토해야 한다.

Abstract ▼ AI-Helper

Long-term shear behavior of the rock discontinuities should be analyzed and its stability should be evaluated to ensure the long-term stability of a high-level radioactive waste disposal repository. The long-term shear behavior of the discontinuities can be modeled with creep and RSF models. The shear creep test, velocity step test, and slide-hold-slide test can be performed to determine their model parameters or analyze the shear behavior by experiments under various conditions. Testing apparatuses for direct shear, triaxial compression, and biaxial shear were mainly used and improved to reproduce the thermo-hydro-mechanical conditions of local bedrock, and it was confirmed that the shear behavior could vary. In order to design a high-level radioactive waste disposal site in Korea, the long-term behavior of rock discontinuities should be investigated in consideration of rock types, thermo-hydro-mechanical conditions, metamorphism, and restoration of shear resistance.

주제어

표/그림 (12)

그림 Fig. 1. Categories of shear behavior depending on gouge thickness (Barton, 1973)
그림 Fig. 2. Shear creep test plots of shear strain and strain-rate against time under the normal stress of 0.6 MPa and the shear stress of 1.095 MPa. The sample was the undisturbed natural fault with gouge between breccia lava (Jia et al., 2018)
그림 Fig. 3. Velocity step test plots of friction coefficient against shear displacement under the normal stress of 10 MPa. The gouge sample was sampled from the subsidiary faults within the damage zone of the Yangsan fault (Woo et al., 2016)
그림 Fig. 4. (a) Direct shear testing machine(Mitchell et al., 2016) (b) Triaxial compression testing machine(An et al., 2022), (c) Biaxial shear testing machine(Kilgore et al., 2017)
그림 Fig. 5. Process of preparing cement-mortar block containing discontinuity with certain JRC (Wang et al., 2021)
그림 Fig. 6. (a) Plot of the ratio of long-term strength to instantaneous strength against JRC (Wang et al., 2018) (b) plot of creep deformation against the ratio of peak shear stress to shear strength (c) schematic diagram of limit curve dividing stable and unstable regions (Wang et al., 2021)
그림 Fig. 7. Plot of friction parameter, a-b, against (a) gouge layer thickness and (b) normal stress. Bare granite surface grinded by 320 grit sandpaper exhibited dominantly unstable slip (Marone et al., 1990)
그림 Fig. 8. Plot of friction parameter, a-b, against temperature for Westerly granite. Open symbols denote results from previous studies (Mitchell et al., 2016)
그림 Fig. 9. Plot of friction parameter, a-b, against (a) temperature for granodiorite gouge and (b) epidote content (An et al., 2022)
그림 Fig. 10. Temperature dependence of (a) intercept and (b) slope of Eq. (7) for Westerly granite (Mitchell et al., 2016)
그림 Fig. 11. (a) Shear assembly for triaxial compression testing apparatus (b) EPDM rubber outer jacket covering the shear assembly, Schematic diagrams of shear assembly (c) before shearing and (d) after shearing. (gray) forcing blocks, (dark gray) fluid distribution frits, (black) EPDM outer jacket, (light blue) FEP inner jacket, (yellow) gouge layer, (green) indium bars, (e) Face of an inverted shear block with grooves (Samuelson and Spiers, 2012)
그림 Fig. 12. Temperature dependence of (a) slope of Eq. (7) and friction parameters, a-b, for (b) dry and (c) wet samples of simulated anhydrite gouge (Pluymakers and Niemeijer, 2015)

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