[논문]유사정적 공진주 시험을 이용한 벤토나이트 완충재와 절리 암반의 역학적 상호작용 특성 평가

김지원; 강석준; 김진섭; 조계춘

doi:10.7474/tus.2021.31.6.561

유사정적 공진주 시험을 이용한 벤토나이트 완충재와 절리 암반의 역학적 상호작용 특성 평가
Evaluation of Mechanical Interactions Between Bentonite Buffer and Jointed Rock Using the Quasi-Static Resonant Column Test 원문보기

터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, v.31 no.6, 2021년, pp.561 - 577

김지원 (한국원자력연구원) , 강석준 (카이스트) , 김진섭 (한국원자력연구원) , 조계춘 (카이스트)

초록
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고준위방사성폐기물 심층처분장 내 압축 벤토나이트 완충재는 지하수 유입으로 인해 포화되어 팽윤하고, 이때 발생하는 팽윤압으로 인해 벤토나이트가 처분공 주변 암반 균열 내로 침투하게 된다. 침투한 벤토나이트는 지하수 흐름에 노출되어 공학적방벽 외부로 침식될 수 있고, 이러한 벤토나이트 완충재의 침식 및 질량 유실은 공학적방벽의 물리적 건전성에 악영향을 미칠 수 있다. 따라서 심층처분시스템의 장기 건전성을 평가하기 위해 지하수 유입과 완충재의 암반 균열 침투에 따른 완충재와 근계암반 사이의 상호작용이 평가되어야 한다. 본 연구에서는 유사정적 공진주 시험기를 이용하여 벤토나이트 완충재의 암반 균열 침투가 근계암반의 역학적 거동에 미치는 영향을 실험적으로 평가하였다. 국내 심층처분장의 완충재 재료로 고려되는 경주 벤토나이트와 한국원자력연구원의 지하처분연구시설에서 채취한 화강암 디스크를 이용해 완충재 충전물이 포함된 등가연속체 절리 암반 시편을 모사하였고, 수직응력 및 포화여부에 따른 탄성파 속도 변화를 측정하여 절리면의 절리수직강성 및 절리전단강성 변화를 유추하였다. 본 연구에서 수행한 실내실험 결과는 향후 불연속면을 고려한 처분시스템 성능평가 해석의 입력변수로 사용될 수 있을 것으로 판단된다.

Abstract ▼ AI-Helper

The compacted bentonite buffer in a geological repository for high-level radioactive waste disposal is saturated due to groundwater inflow. Saturation of the bentonite buffer results in bentonite swelling and bentonite penetration into the rock discontinuities present around the disposal hole. The penetrated bentonite is exposed to groundwater flow and can be eroded out of the repository, resulting in bentonite mass loss which can affect the physical integrity of the engineered barrier system. Hence, the evaluation of buffer-rock interactions and coupled behavior due to groundwater inflow and bentonite penetration is necessary to ensure long-term disposal safety. In this study, the effects of the bentonite penetration and swelling on the physical properties of jointed rock mass were evaluated using the quasi-static resonant column test. Jointed rock specimens with bentonite penetration were manufactured using Gyeongju bentonite and hollow cylindrical granite rock discs obtained from the KAERI underground research tunnel. The effects of vertical stress and saturation were assessed using the P-wave and S-wave velocities for intact rock, jointed rock and jointed rock with bentonite penetration specimens. The joint normal and joint shear stiffnesses of each joint condition were inferred from the wave velocity results assuming an equivalent continuum. The joint normal and joint shear stiffnesses obtained from this study can be used as input factors for future numerical analysis on the performance evaluation of geological waste disposal considering rock discontinuities.

주제어

표/그림 (12)

$Fig. 1. Schematic diagram of bentonite intrusion into a rock fracture$ 그림 Fig. 1. Schematic diagram of bentonite intrusion into a rock fracture
그림 Fig. 2. Quasi-static resonant column test
그림 Fig. 3. Typical quasi-static resonant column test results
그림 Fig. 4. Long wavelength propagation in jointed rock
표 Table 1. Material properties of rock specimens used in this study
그림 Fig. 5. Specimen preparation
그림 Fig. 6. Effects of rock joints and saturation on the wave propagation characteristics (a) P-wave velocity (b) S-wave velocity and (c) Damping ratio
그림 Fig. 7. Effects of saturation on the wave propagation characteristics of bentonite-filled jointed rocks (a) P-wave velocity (b) S-wave velocity and (c) Damping ratio
그림 Fig. 8. Wave velocity-stress power relationship
그림 Fig. 9. Deformation characteristics in equivalent continuum rock mass
그림 Fig. 10. Joint stiffness estimation
그림 Fig. 11. Specimen deformation at the bentonite-filled joints with water-induced swelling

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