• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.13 no.4
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• pp.21-26
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• 1999

Using daylight in underground spoce may significantly reduce electric lighting load and give a visually comfortable environment. This reper describes a fundaIrentaI study on light duct system to predict inter illuminance ratio on underground periIreter occupied zone level. As a result, integral equation for inter-reflection program are developed and by using optimize light duct system can gives daylight on deep underground space. space.

• Tunnel and Underground Space
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• v.21 no.4
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• pp.281-286
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• 2011

The west underground express way is a recent initiated BTO (Build-Transfer-Operate) project for releasing heavy traffic of the existing west express way which is notorious on-ground road for extremely traffic stuck area in the west of Seoul, South Korea. The new express way for light vehicles is the first double-deck tunnel ever designed in South Korea and 10.91 km long including both open cut structures and concrete lining with middle-deck in bored tunnel. Because the new express way is going through underground of heavily populated area, mechanical & electrical design for the safety of drivers in tunnel is one of the most important parts among many design issues. This paper discusses M & E design focuses including ventilation-evacuation plan and various safety facilities.

• Journal of the Korean Magnetics Society
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• v.19 no.2
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• pp.67-73
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• 2009

The changes of geomagnetic flux density distribution on the ground surface by underground empty spaces had been investigated through the variations of the soil density and measuring heights. The geomagnetic flux density distributions were monitored for the surfaces of different density, sink-hole and tunnel by fluxgate-type magnetometer. The underground empty space and low soil density decreased the geomagnetic flux densities, which were decreased from the boundary of raw and low-density (empty) grounds, and showed the lowest value at the center of low-density (empty) ground. The decreases of geomagnetic flux density by underground empty spaces could be found at the surface with the tunnel located at 80 m underground. And, the underground defects of empty spaces, low density zone, fracture zone and sink holes could be monitored by the phenomena of this decreasing flux density.

• Journal of Korean Tunnelling and Underground Space Association
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• v.9 no.3
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• pp.241-250
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• 2007

During enlarging an existing tunnel under operation, unexpected excessive overbreaks and large cavities around the tunnel were found. It was an issue that they might influence the stability the new tunnel. The overbreaks and cavities are assumed that they were attributed to excessive blasting under the condition of insufficient ground investigation. To enlarge the existing tunnel safely, therefore, a remedy measure for the overbreaks and cavities is suggested.

• Journal of the Korean Professional Engineers Association
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• v.26 no.1
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• pp.61-63
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• 1993

• Tunnel and Underground Space
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• v.7 no.3
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• pp.246-252
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• 1997

원자력 발전 과정에서 부산물로 발생되는 사용후 핵연료와 같은 고준위 방사성폐기물은 수백 만년동안 인간 및 자연 환경에 영향ㅇ르 미치기 때문에 엄격한 관리가 요구된다. 이를 위하여 세계 각국에서는 KBS-3 개념과 같이 고준위 방사성폐기물을 지하 500미터 심도의 암반에 영구 처분하기 위하여 연구를 수행사고 있다. 이러한 연구 활동의 일환으로 고준위 방사성폐기물에서 발생하는 방사성 붕괴열로 인한 처분장 인접 암반에서의 응력 변화 및 이에 따른 주변 암반대에서의 지하수 유동 현상 규명을 위한 연구가 지난 1980년대부터 활발하게 진행되고 있는 바, 그 대표적인 연구 과제가 DECOVALEX 국제 공동 연구이다. 이 글에서는 현재 진행 중인 DECOVALEX 연구 현황과 향후 전망에 관하여 조명하고자 한다.

• Proceedings of the KSEG Conference
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• 2005.04a
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• pp.235-242
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• 2005

본 연구에서는 퇴적암의 시험 관련자료 2,000 여건을 사암(역암 포함), 셰일 및 석회암으로 구분하여 흡수율, 단위중량, 일축압축강도, 점착력, 내부마찰각, 인장강도, 탄성계수, P파속도 및 S파속도 등의 특성치 분포도와 상관성을 분석하였다. 이러한 암석 특성치는 지하공간개발시 안전하고 경제적인 설계와 시공에 참고자료로 활용될 수 있는데 퇴적암의 강도특성 분석결과 사암과 석회암이 셰일 보다 전반적으로 양호하여 대규모 지하공간개발에 유리한 것으로 평가하였으며, 또 84% 신뢰도를 만족하는 범위에서 퇴적암의 암종별 공학적 특성치의 상관관계식을 유도하였다.

• Magazine of korean Tunnelling and Underground Space Association
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• v.21 no.2
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• pp.58-72
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• 2019

• Journal of Korean Tunnelling and Underground Space Association
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• v.16 no.4
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• pp.373-386
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• 2014

This paper concerns the deformation behavior of tunnels crossing weak zone during excavation. A three dimensional finite element model was adopted in order to conduct a parametric study on the orientation of weaj zone in terms of strike and dip angle relative to the tunnel longitudinal axis. The results of the analyses were then analyzed so that the tunnel displacements in terms of the ratios between the crown settlement and springline displacement can be related to the orientation of the weak zone. The results indicate that the displacement ratios between the tunnel crown and springline tend to quantitatively change when a weak zone exists near or ahead of the tunnel suggesting that the displacement ratios can be effectively used to predict the weak zone during tunnelling. Practical implications of the findings are discussed.

• Journal of Korean Tunnelling and Underground Space Association
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• v.17 no.3
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• pp.189-204
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• 2015

This paper presents the results of reduced scale model tests on the effect of fault zone characteristics on the tunnel deformation behavior. A series of model tests were carried out on deep tunnels considering different fault zone orientations and offset distance. The tunnelling process was simulated in the model tests using compressed air technique. During the tests, the tunnel and ground deformation were mainly monitored while reducing the pressure inside the tunnel and the relationship between the pressure level and the tunnel deformation were established. The results indicate that for a given offset distance the tunnel behavior is influenced the most when the fault zone dips vertically while smallest influence occurs when the fault zone dips 45 degrees.