• Magazine of korean Tunnelling and Underground Space Association
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• v.13 no.6
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• pp.23-32
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• 2011

• Journal of Korean Tunnelling and Underground Space Association
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• v.18 no.6
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• pp.535-544
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• 2016

Special tunnel design and construction methods have been suggested due to developments of subway and tunnel. Collapse accidents of tunnel bring enormous damage. So, observation and analysis for the safety of tunnelling and behaviour of surrounding ground are important. But, it is not economical to implement the field test in every time. Therefore, this study has measured ground behaviour due to excavation of 2-arch tunnel station according to offset between grouped pile and tunnel by laboratory model test. For the model test, trapdoor device was adopted. Tunnelling is simulated by volume loss of 2-arch tunnel. Ground displacements are observed by close range photogrammetric method and image processing. In addition, these data are compared with numerical analysis.

• 지반과기술
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• v.9 no.3
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• pp.14-25
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• 2012

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2003.03a
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• pp.51-66
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• 2003

최근 용지매입의 제한과 자연환경훼손의 최소화를 도모하는 사회적 환경으로 인해 대단면 근접병설터널 계획이 점차 증가하고 있다. 지금까지는 주로 중앙벽체부의 지지기능을 활용한 2Arch터널의 형태로 도심지 지하철의 정거장이나 고속도로의 일부구간에 계획되고 있으나, 대단면 근접병설터널에 대한 시공실적 및 설계사례가 부족한 국내에서는 이에 대한 역학적 거동과 합리적 시공방안에 대한 연구가 미흡한 실정이다. 따라서, 대단면 근접병설터널에 대한 국내·외의 설계 및 시공사례를 정리·분석하므로서 차후 제한된 구간에서의 터널계획시 합리적인 설계 및 시공이 되고자 하였다. 또한, 최근 도심지 구간에 계획중인 터널의안정성 검토 사례를 중심으로 터널 및 인접구조물, 중앙필러부 및 콘크리트 라이닝에 대한 상세 안정성 검토방법을 고찰함으로써 기존 병설터널의 거동특성과는 구별되는 대단면 근접 병설터널의 안정성 평가기법에 대한 방향을 제안하였다.

• Proceedings of the KSR Conference
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• 2001.05a
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• pp.424-430
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• 2001

현대건설(주)는 사업 주관사로서 해외 업체와 대만고속전철 턴키 공사를 2000 년 1 월에 공동으로 수주하였다. 고속전철의 총 연장 길이는 약 326 km 이며, 정거장 10 개소, Depot 및 야적장으로 구성되어 있다. 이번에 수주한 공구는 2 개의 연속된 공구 (C230, C240) 이며, 본 논문은 총 연장 23.6km 인 C230 공구에 대한 설계 과정을 수록하였다. C230 공구는 NATM 터널 (6.2km), Cut-and-Cover 터널 (0.5km), 교량 (7.8km) 및 토공 구간 (9.1km)으로 구성되어 있다. 전 구간의 지반조건은 "매우" 취약한 매질로 구성되어 있으며, 층리나 절리는 거의 발달되어 있지 않다. 따라서 화약발파에 의한 터널 굴착은 기계식 굴착 (Back-hoe Excavation) 방법에 비하여 현실성이 없는 것으로 분석되었다. 취약한 지반에서 계측 결과를 기준으로 굴착 공간을 안전하게 유지할 수 있는 NATM 보강 설계가 현지 암반조건에 가장 이상적인 방법으로 제시되었다. 특히, NAT설계는 대형 아파트 지역과 파쇄대 및 지하수 침투 예상지역을 통과하기 위하여 계측에 의한 Feed-back 과정을 탄력적으로 적용하도록 계획하였다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.9 no.2
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• pp.171-182
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• 2007

For minimizing the effect on the focus of civil traffic and environment conditions related to the excavation at the traffic jamming points, an underground station tunnel was planned with 35.5 m in length and bigger area than $200\;m^2$ in sedimentary rock mass. It faced the case that the overburden was just under 13 m. Not based on a pattern design but on the case histories of similar projects and arching effect, the design of large section tunnel under shallow overburden was investigated on three design subjects which are shape effect on the section area, application method of support pressure, and supporting and tunnel safety. According to the mechanical effect from section shape, a basic design and a preliminary design was obtained, and then supporting method of large section was planned by the supporting of NATM and a pipe roof method for subsidence prevention and mechanical stability. From the comparative study between both designs, it was found that the basic design was suitable and acceptable for the steel alignment of tunnel lining, safety and the design parameter restricted by the limit considered as partition of the excavation facilities. Through the analysis result of preliminary design showing the mechanical stability without stress concentration in tunnel arch level, it also was induced that shape effect of the large section area and yielding load obtained from deformation zone in the surrounding rock mass of tunnel have to be considered as major topics for the further development of design technique on the large section tunnel.

• Journal of the Korea institute for structural maintenance and inspection
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• v.8 no.4
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• pp.145-152
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• 2004

Red sedimentation substance contains large portion of Fe. The earth retaining structure of a tunnel and ground water containing more portion of Fe than other area are the major factor of this substance In case of white sedimentation substance, the most frequently founded ingredient is CaO, which is occurred in case grouting injection materials for ground reinforcement is transmitted into a tunnel system by ground water. This substance is doesn't affect safety of a tunnel Black sedimentation substance is often found in tunnels near station. This substance is a mixture of either white or red sedimentation substance and detergent material in station transmitted to a tunnel drainage system.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.11a
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• pp.541-544
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• 2011

경량전철시스템은 운전자가 없는 무인으로 운행하며 각종 설비가 자동으로 제어되도록 되어있기 때문에 일상적인 고장이나 문제는 어느 정도 안전대책이 마련되겠지만 테러 또는 고의에 의해 일어나는 사고는 대비하기가 어려운 실정이다. 정거장에서의 화재발생은 많은 보고서와 기준들이 정리되어 있으나 지하 터널이 본선 구간에서의 피난을 위한 시설의 적정성 및 피난시간에 대한 연구는 부족하다. 본 연구에서 경량전철 시스템의 운전 중에 지하터널에서 발생 가능한 사고시나리오를 고려하여 화재시뮬레이션 및 피난시뮬레이션을 실시하여 비교하고, 그 결과에 따라 대안을 도출하였다.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.119-127
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• 2011

This paper shows development of 1-3 dimensional hybrid mesh method to analysis flow induced by ultra-high speed vehicle inside a long distance tunnel. For three-dimensional analysis of the tunnel system many meshes are required. However it is not efficient to calculate the whole tunnel system in three-dimension. Therefore in this paper, three-dimension meshes was used to describe stations, shafts and around vehicle, and one-dimension meshes was used to describe the tunnel except these three sections. And unsteady flow analysis of the ultra-high speed vehicle was performed with UDFs in commercial software, Ansys vr. 12.0.

• Explosives and Blasting
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• v.39 no.3
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• pp.24-34
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• 2021

Electronic detonators are widely used in various construction sites due to accurate delay time. Including the cases with exceeded noise and vibration from site using electric/non-electric detonator, electronic detonators are used to improve blast fragmentation or to reduce the cost of secondary partial blasting. Furthermore, the number of cases using electronic detonators are increased for reduction of the cost and construction period by maximizing operations efficiency. This case study is about applying electronic detonators on large section station, tunnel construction site which is the part of urban area GTX A project. Although it was initially planned to utilize non-electric detonators, damage was inflicted on safety-thing. We have considered blasting method using electronic detonators as solution of this problem. By applying electronic detonators, we not only satisfied environmental regulations but also prevented nearby safety-thing from getting damaged. In addition, we were able to shorten the construction period than the initial plan by conducting single simultaneous blasting on large section station, in order to ensure safe and efficient construction.