• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.1136-1141
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• 2004

This paper presents the design case of the 3-arch tunnel under existing railways and railway station building. The original construction method was the underpinning method supported by pipe-roof, but it was changed to the minded tunnelling method because of the complex construction condition and the safety problem. This 3-arch tunnel has a width of 28 meters and a height of 10 meters. Overburden is only 23m and the ground consists of the weathered soil and rock. Because the allowable settlements for the station building and railways are limited strictly, various measurements for the tunnel stability and the settlement minimization was considered.

• 화약ㆍ발파
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• 제23권1호
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• pp.41-46
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• 2005

터널 굴착 작업에서 여굴의 발생은 필연적이라고 할 수 있다. 여굴의 발생은 터널공사에서 공사비 및 안전성에 지대한 영향을 미치게 된다. 여굴은 지질구조를 정확하게 예측하지 못하거나, 적정 장약량을 산정하지 못하는 등 다양한 원인으로 발생한다. 따라서 본 논문에서는 터널 굴착 시 여굴을 최소화할 수 있는 방안으로 다단 천공공법에 대하여 소개하고자 한다. 다단천공 공법은 기존 천공방법보다 천공비용의 증가를 초래하나, 굴착 시 여굴량을 감소시킴으로써 전체 공사비용은 감소시킬 수 있을 것으로 기대된다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2002년도 춘계 학술대회논문집
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• pp.41-46
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• 2002

Computational study has been undertaken to investigate the aerodynamic influence of side jet on a supersonic missile and to find a similarity condition between the flight condition and the wind tunnel testing. Tasks were peformed to validate the existing Raytheon test body with side jet, to simulate the flow inside the supersonic wind tunnel, and to compare the flow fields between the missile in free flight and that in the wind tunnel. Then sub-scale model of body-tail configuration was analyzed to estimate the influence of the side jet on the missile components. It is found that the influence of side jet is not as significant on the tail region as on the body surface and a simple algebraic formula for aerodynamic coefficients accounting for the side jet as a point force may be cautiously utilized in setting up control logic.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.454-461
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• 2005

There are many cross tunnelling methods such as NTR, TRCM, Messer Shield, Front Jacking, and Pipe Roof Method. The advantages of adopting RPS(Roof Panel Shield) method in crossing tunnel construction with comparing other existing cross tunnelling method are needed a little space and easy to change the direction of cutting shoe during the construction of pipe roof. The 3-dimensional numerical analysis of RPS was performed for the application in the crossing tunnel under railroad. The earth pressure distribution and settlement were predicted when the RPS method was applied during the excavation for crossing railroad tunnel construction.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.509-515
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• 2002

While performing the advisory services of the electrification of conventional lines for KTX(Korea High Speed Train), we faced the speed-up problem of catenary system for the existing narrow tunnel. To solve this problem, the new system, to be named "Oblique encumbrance tunnel catenary", was developed. This system is mainly characterized by a simple catenary type, a dual bracket, a oblique encumbrance, a small system height and the same bracket used for the radial tension load and compression one. In this paper, the basic concepts, overall system configuration and main points considered in a design phase for the ′oblique encumbrance tunnel catenary′ are described. Moreover, the detail design criteria and other contents like manufacturing pilot products and verifying the performance through a factory and site test are added.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.891-896
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• 2008

절리암반에서 기존 터널에 근접하여 사면을 굴착하면 터널의 거동은 절리와 사면의 경사에 따라 영향을 받는다. 본 연구에서는 실대형 실험을 실시하여 터널에 근접하여 사면을 굴착시 사면각도와 절리각도에 따른 터널의 내공변위, 터널 라이닝의 부재력 등의 특성을 분석하였다. 분석결과 절리각도와 사면각도가 크면 클수록, 터널 내공변위와 모멘트는 커지는 경향이 있으며, 절리각도와 사면각도에 따라 지중변위 크기와 방향이 다르게 나타나고 있어 향후 사면보강에 있어 효율적 방안제시가 가능할 것이다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 춘계 학술기술논문발표대회 논문집
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• pp.185-190
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• 2005

Safe, economical and environment-friendly tunnel construction are required again along with social continuous development, the importance of waterproof work that is portion that actually all of user and builder can find that is embossed by tunnel construction's one of important construction. Also, ECB (Ethylen Copolymer Bitumen) sheet that is used in existing tunnel waterproofing method (ECB waterproofing method) being black because asphalt (Bitumen) is added, by purpose that make illumination of tunnel interior brightly and scar discovery eases in sheet with coating white film, but ECB that is used present according as ECB that asphalt is added does not satisfy high tensile strength of construction field, quality standard of extension. Also ECB denigrates color of black M/B that asphalt is excepted.

• 터널과지하공간
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• 제21권4호
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• pp.281-286
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• 2011

최근, 서울시는 기존 서부간선도로의 극심한 교통정체 문제 해결을 위하여 연장 10.91 km에 달하는 새로운 소형차 전용 지하도로를 계획하였으며, 국내최초로 복층터널 형식을 적용하였다. 새로 건설될 서부간선 지하도로가 밀집한 도심지의 대심도 지하공간에 계획되므로, 인명피해 최소화를 위한 환기 및 방재계획이 중요한 문제로 대두되었으며, 본 고에서는 도심지 대심도 초장대 터널내 설비 및 안전시설에 관한 주요계획을 소개하고자 한다.

• Geomechanics and Engineering
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• 제10권1호
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• pp.21-35
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• 2016

Employing non-associated flow rule and Power-Law failure criterion, the failure mechanisms of tunnel roof in homogeneous and layered soils are studied in present analysis. From the viewpoint of energy, limit analysis upper bound theorem and variation principle are introduced to study the influence of dilatancy on the collapse mechanism of rectangular tunnel considering effects of supporting force and seepage force. Through calculation, the collapsing curve expressions of rectangular tunnel which are excavated in homogeneous soil and layered soils respectively are derived. The accuracy of this work is verified by comparing with the existing research results. The collapsing surface shapes with different dilatancy coefficients are draw out and the influence of dilatancy coefficient on possible collapsing range is analyzed. The results show that, in homogeneous soil, the potential collapsing range decreases with the decrease of the dilatancy coefficient. In layered soils, the total height and the width on the layered position of possible collapsing block increase and the width of the falling block on tunnel roof decrease when only the upper soil's dilatancy coefficient decrease. When only the lower soil's dilatancy coefficient decrease or both layers' dilatancy coefficients decrease, the range of the potential collapsing block reduces.

• Geomechanics and Engineering
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• 제15권2호
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• pp.769-774
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• 2018

The growth of cities requires the construction of new tunnels close to the existing ones. Prediction and control of ground movement around the tunnel are important especially in urban area. The ground respond due to EPB (Earth Pressure Balance) pressure are investigated using the finite element method by ABAQUS in intersection of the triplet tunnels (Line 2, 3 and 4) of Mashhad Urban Railway in Iran. Special attention is paid to the effect of EPB pressure on the tunnel face displacement. The results of the analysis show that in EPB tunneling, surface settlement and face displacement is related to EPB pressure. Moreover, it is found that tunnel construction sequence is a great effect in face displacement value. For this study, this value in Line 4 where is excavated after line 3, is smaller than that line. In addition, the trend of the displacement curves are changed with the depth for all lines where is located in above and below, close to and above the centerline tunnel face for Line 2, 3 and 4, respectively. It is concluded that: (i) the surface settlement decreases with increasing EPB pressure on the tunnel face; (ii) at a constant EPB pressure, the tunnel face displacement values increase with depth. In addition, this is depended on the tunneling sequence; (iii) the trend of the displacement curves change with the depth.