• Magazine of korean Tunnelling and Underground Space Association
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• v.16 no.3
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• pp.58-66
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• 2014

• Magazine of korean Tunnelling and Underground Space Association
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• v.15 no.5
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• pp.55-64
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• 2013

• Magazine of the Korean Society of Hazard Mitigation
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• v.6 no.2 s.21
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• pp.52-70
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• 2006

최근 잦은 기상이변과 대규모 태풍(2002년 루사, 2003년 매미 등)에 의해 기존 댐의 안정성이 미흡한 것으로 판단됨에 따라 최대가능홍수량(PMF) 유입시 소양강 댐의 수문학적 안정성 확보와 용수공급량 및 발전용량의 확보, 댐 주변 노후시설의 자연 친화적 개보수에 의한 친환경적 공간창출과 이로 인한 관광 수요 증대에 따른 지역경제 활성화를 목적으로 기존 여수로에 추가하여 보조여수로가 계획되었다. 보조여수로는 수리적 특성, 지반조건, 인문사회적 여건 및 문화재 등 기타 기반여건을 감안하여 1,276.4m와 1,206.4m, 2련 14도 완경사 터널식 여수로로 설계되었으며 터널은 폭 $14{\sim}25m$의 대단면으로 계획되었다. 보조여수로는 유입부 및 유출부 구조물, 천이부터널 및 일반터널, 개착터널로 계획되었으며 각 구조물의 수문학적 안정성을 바탕으로 설계되었다.

• Magazine of korean Tunnelling and Underground Space Association
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• v.14 no.2
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• pp.67-76
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• 2012

• Journal of Korean Tunnelling and Underground Space Association
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• v.19 no.3
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• pp.489-501
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• 2017

The collapse accidents during a open ground excavation in urban areas not only lead to human injuries and material damages in the construction site, but also lead to road sinks and damages to the adjacent facilities due to settlement of ground around the construction site. Therefore, during a open ground excavation in the urban areas, it is necessary to thoroughly prepare for prevention of collapse accidents, and consider whole construction stage such as planning, design and construction. In this study, the priorities to be managed mainly were obtained in order to prevent collapse accidents during a open ground excavation. After analyzing results from past accidents cases for open ground excavations, priorities were evaluated regarding collapse-inducing elements using the Delphi technique which is a decision-making method by consensus among experts. As a result, insufficient groundwater treatment, bad geotechnical investigation and instability on construction, etc. were obtained as priorities for prevention of collapse accidents.

• 지반과기술
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• v.2 no.2
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• pp.45-48
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• 2005

• 지반과기술
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• v.6 no.4
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• pp.50-50
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• 2009

• 도로교통
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• s.98
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• pp.57-75
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• 2004

• Journal of the Korean Geotechnical Society
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• v.23 no.3
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• pp.25-40
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• 2007

Excessive earth pressure is one of the major mechanical factors in the deformation and damage of Cut-and-Cover Tunnel lining in shallow tunnels and portals of mountain tunnels (Kim, 2000). Excessive earth pressure may be attributed to insufficient compaction and consolidation of backfill material due to self-weight, precipitation and vibration caused by traffic (Komiya et al., 2000; Taylor et al., 1984; Yoo, 1997). Even though there were a lot of tests performed to determine the earth pressure acting on the tunnel lining, unfortunately there were almost no case histories of studies performed to determine remedial measures that reduce differential settlement and excessive earth pressure. In this study the installation of geotextile mat was selected to reduce the differential settlement and excessive earth pressure acting on the cut-and-cover tunnel lining. In order to determine settlement and earth pressure reduction effect (reinforcement effect) of geotextile mat reinforcement, laboratory tunnel model tests were performed. This study was limited to the modeling of rigid circular cut-and-cover tunnel constructed at a depth of $1.0D\sim1.5D$ in loose sandy ground and subjected to a vibration frequency of 100 Hz. Model tests with varying soil cover, mat reinforcement scheme and slope roughness were performed to determine the most effective mat reinforcement scheme. Slope roughness was adjusted by attaching sandpaper #100, #400 and acetate on the cut slope surface. Mat reinforcement effect of each mat reinforcement scheme were presented by the comparison of earth pressure obtained from the unreinforced and mat reinforced model tests. Soil settlement reduction was analyzed and presented using the Picture Analysis Method (Park, 2003).

• Journal of the Korean Geotechnical Society
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• v.17 no.6
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• pp.173-180
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• 2001

This research is aimed at investigating the dynamic response of cut-and-cover tunnel to seismic waves. We carried out shaking table test which is used a 1/40-scale(the width of prototype tunnel is about 14.2m, the height is about 8.5m) model for this research, and we analyzed the effect of depth of tunnel and slope of the ground in relation to the dynamic responses of tunnel. As a result of the test, the stress and acceleration along the tunnel decreased accordingly to the depth of increment, and this phenomenon is caused by the increase of the confining effect of ground. Also, the dynamic responses of tunnel showed a tendency to rise according as ground declined gently. In comparison the result of shaking table test with that of structural analysis on ordinary condition, we conclude that seismic waves do not affect cut-and-cover tunnel when the depth of tunnel is over the diameter of tunnel.