• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2006.09a
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• pp.122-134
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• 2006

현재 한국원자력연구소에서는 고준위폐기물 처분시스템의 다양한 현장 실증연구를 위해 원자력연구소내 지하처분연구시설(KAERI Underground Research Tunnel, KURT)가 건설되었다. 터널 크기 $6m{\times}6m$, 총길이 255m(진입터널 180m, 연구모듈 75m) 인 KURT는 결정질 화강암반에 위치하고 있다. KURT 에서는 개념설계, 부지조사, 시설설계, 건설 과정에서 다양한 암석 역학 관련 연구들이 수행되었다. 물리탐사, 시추공조사, 암석물성시험, 현장 물성 시험 등을 통해 KURT 의 구조적 안정성 평가에 필요한 암석 및 암반의 물성이 얻어졌으며 이들 물성은 해석 모델의 입력자료로 활용되었다. 본 연구에서는 KURT 에서 수행되었던 암석역학 관련 시험과 주요들을 소개하고 시험을 통해 얻어진 주요 결과와 이를 활용한 3차원 구조해석에 대해 논의하고자 한다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.199-207
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• 2004

In order to develop a safe geological disposal concept for the HLW from the nuclear power plants in Korea, it is necessary to evaluate the safety of the disposal concept in an underground research tunnel in the same geological formation as the host rock mass. The design concept of a research tunnel depends on the actual disposal concept, repository geometry, experiments to be carried at the tunnel, and geological conditions. In this study, geological investigation had been carried out to develop the basic design of the small scale underground disposal research tunnel in KAERI.

• Explosives and Blasting
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• v.23 no.4
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• pp.1-18
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• 2005

The underground research tunnel, which is under construction in KAERI for the validation of HLW disposal system, is excavated in a granite rock by drill&blasting. In order not to disturb the operation at the research facilities including Hanara reactor by the blasting for the excavation of $6m{\times}6m$ tunnel, a test blasting at the site was performed. Using the vibration equation derived from the test blasting, it was possible to predict the vibration at different locations at KAERI and to conclude that the blasting design would meet the design criteria at the major facilities in KAERI. The noise and vibration generated by the main blasting were continuously measured. In the case of vibration, the measured values were lower than the predicted one from the vibration equation. It is, therefore, concluded that the influence of blasting work for the construction of 280m long research tunnel on the major facilities in KAERIl would be insignificant.

• Tunnel and Underground Space
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• v.17 no.1 s.66
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• pp.43-55
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• 2007

An underground research tunnel, KURT, was constructed at Korea Atomic Energy Research Institute, for various in situ validation experiments related to the development of a high-level radioactive waste disposal system. KURT, which has length of 255 m (access tunnel 180 m and research modules 75 m) and size of $6m{\times}6m$ was excavated in a cryatalline rock mass. In the KURT project, different rock mechanics studies had been carried out during the concept design, site characterization, detailed design, and construction stages. From the geophysical survey, borehole investigation, and rock property tests in laboratory and in situ, the rock and rock mass properties required for the mechanicsl stability analysis of KURT could be achieved and used for the input parameters of computer simulations. In this paper, important results from the rock mechanics studies at KURT and the three-dimensional mechanical stability analysis will be introduced.

• Tunnel and Underground Space
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• v.15 no.2 s.55
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• pp.87-101
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• 2005

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11a
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• pp.199-200
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• 2005

• Tunnel and Underground Space
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• v.14 no.3
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• pp.175-187
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• 2004

고준위방사성폐기물 처분의 경우 심부 암반에 만들어진 처분장에 영구 처분하는 것이 최선의 방안으로 여겨지고 있다. 하지만 지하 심부의 암반에 대한 물리적, 화학적, 역학적, 열적, 수리적 물성과 이들과 핵종 이동의 관계, 처분환경에서의 공학적 방벽 및 암반의 거동이 처분장 안정성 및 안전성에 미치는 영향 등을 파악해야하는 어려움이 따른다. 특히 고준위폐기물 처분의 경우 장기간의 안전성을 고려해야하기 때문에 자연방벽과 공학적 방벽의 시간에 따른 거동변화도 고려하여야 할 필요가 있다. (중략)

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.226-227
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• 2004

본 연구에서는 원자력 연구소 내에 건설할 고준위 폐기물 지하처분연구시설 부지에 관한 특성을 파악하고, 연구시설의 위치를 선정하기 위한 지질학적 연구를 실시하였다. 지표지질조사를 통하여 연구소 내에 분포하는 암석들의 분류와 선구조 분석을 실시하였고, 지구물리탐사와 시추조사를 통한 지하 암반의 분포양상과 연구시설 주변의 추정되는 파쇄대의 분포를 확인하였다. 지표지질조사결과 복운모화강암과 화강섬록암질 편마암이 점이적인 관계로 분포하고 있으며 (Fig.1, 3), 이들 화강암류 내에는 암맥상으로 중성 혹은 염기성 암맥들이 절리의 방향과 동일하게 관입 분포한다. 절리의 방향성은 N30E, N80W, NS방향으로 분포하고 있다(Fig. 2).(중략)

• Tunnel and Underground Space
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• v.14 no.3
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• pp.188-202
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• 2004

If an underground research facility for the validation of disposal concept is constructed in KAERI, it is expected to have a thick weathered zone and varying surface topology. In this study, the influence of different geological conditions, tunnel slope, tunnel size, and sequential excavation is investigated by 3D mechanical analysis using FLAC3D. Around the tunnel, it is not expected to develop any plastic zone and the maximum stress might be as high as 5 ㎫. The maximum compressive stress will be developed at about 20 m to e dead end of the tunnel. There is no difference on stress and displacement distributions between the cases with and without sequential excavation. It is expected to have stress release in the roof and floor after the excavation of the tunnel. There is no significant influence of weathered zone size, tunnel size, and tunnel slope on the stress and displacement distributions. The modeling for the intersection shows the minimum factor of safety is above 3, when the in situ stress ratio K is 3. From the study, it was possible to demonstrate that the small scale disposal research tunnel in KAERI will be mechanically stable.

• Explosives and Blasting
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• v.23 no.2
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• pp.1-14
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• 2005

The Korean Atomic Energy Research Institute is currently planning the construction of an Underground Research Tunnel to carry out research and development related to the disposal of high-level wastes from nuclear reactors used to generate electrical power. This paper discusses the excavation methods used to construct the Canadian Underground Research Laboratory and their application in planning for the construction of a similar underground laboratory and eventually an underground repository for high-level wastes in Korea.