• 설비공학논문집
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• 제13권5호
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• pp.321-332
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• 2001

In this study, a design program for ventilation requirements of a longitudinal raod tunnel were developed and investigated. The control volume method was applied to calculate the local air velocity and the local concentration distribution of pollutants, CO, $NO_x$, soot along the tunnel for various tunnel ventilation system. This program was validated by comparing with the practical design data for the road tunnel ventilation system. The calculation results were in good agreement with the practical design data.

• 한국지반공학회논문집
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• 제19권5호
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• pp.327-333
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• 2003

터널 및 지하공동 설계에 이용된 23개 지역의 578개의 시추공발파 진동 data와 시공 중인 일반터널의 4개 지역으로부터 221개 진동 data를 이용, 시추공발파의 진동전달 특성을 분석하였다. 시추공발파와 일반터널발파의 진동속도 감쇠 경향을 비교 분석한 결과 시추공발파의 입지상수들이 크게 나타났다. 환산거리가 클 때 최대 허용장약량은 시추공발파의 식으로 계산한 것이 더 적었다. 주진동수에 대한 주파수 분석결과 시추공발파는 30∼60Hz, 일반터널발파는 60∼90Hz로 나타났다. 이러한 결과로부터 시추공발파 자료를 터널발파 설계에 직접 사용하는데 다소의 문제가 있는 것으로 판단되며 보다 정확한 설계를 위하여 통계적 처리가 불가피할 것으로 보인다.

• 한국터널공학회:학술대회논문집
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• 한국터널공학회 2005년도 학술발표회 논문집
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• pp.335-340
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• 2005

Recently, According to increased tunnel accident, a matter of concern in tunnel fire safety is on an interesting trend. In case of tunnel fire, Evacuation is a primary factor for refugee safety. Therefore safety measures should be taken to increase capability of evacuation. Evacuation walking speed and characteristics of movement in tunnel is differ from building or outdoor site so, these characteristics must be considered in tunnel safety planning. In this study has performed to evaluate the smoke movement and characteristics of evacuation by full-scale test method. and aimed for basic data establishment in characteristics of evacuation for tunnel safety system design.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1993년도 가을 학술발표회논문집
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• pp.32-37
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• 1993

A method of tunnel analysis for a new type of tunnel construction method (ACLCM, Automatic Concrete Lining Construction Method) is presented here. ACLCM is an unique tunnel construction method which provides concrete lining at the end of shield machine by extruding concrete into the space between the excavated ground surface and the inner form (Automatic Concrete Lining Machine). Since behaviors of tunnel and the surrounding soils are greatly influenced by the construction method, existing tunnel design methods may not be applicable to the design of ACLCM tunnel. In this study, a method of ACLCM tunnel analysis is suggested to provide the prediction of behavior of ACLCM tunnel and surrounding soils as well as to check up the safety during the construction and after the completion of ACLCM tunnel

• Management Science and Financial Engineering
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• 제12권2호
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• pp.37-62
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• 2006

This paper considers the problem of designing logical tunnels in virtual private networks considering QoS guarantee which restricts the number of tunnel hops for each traffic routing. The previous researches focused on the design of logical tunnel itself and Steiner-tree based solution algorithms were proposed. However, we show that for some objective settings it is not sufficient and is necessary to consider both physical and logical connectivity at the same time. Thereupon, the concept of the layered network is applied to the logical tunnel design problem in virtual private networks. The layered network approach considers the design of logical tunnel as well as its physical routing and we propose a modified branch-and-price algorithm which is known to solve layered network design problems effectively. To show the performance of the proposed algorithm, computational experiments have been done and the results show that the proposed algorithm solves the given problem efficiently and effectively.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.1343-1350
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• 2005

In this study, the whole deformation conditions of domestic old tunnels and reinforcement methods for deformation tunnels were investigated and analysed, and the present conditions, occurrence cause and reinforcement methods of cavity behind the tunnel lining were investigated and analysed comprehensively. The deformation causes of domestic old tunnels could be classified in three kinds : change of earth pressure operating tunnel ground, material problem of concrete lining, mistake of design and construction. As a result of analysis, the tunnel deformation was occurred by not specific cause but various cause As a result of investigation for 455 domestic tunnel data, more than 70% of the tunnel deformation was related to leakage and the other deformation cause also accompanied leakage mostly. An applied reinforcement method was related to leakage and flood prevention measures, but application of reinforcement method for boundary area between tunnel and ground and tunnel periphery which influence on the tunnel stability was still defective. The cavity of domestic old tunnel occupied about 16% of the total tunnel length and about 68% of cavity was located in the crown of tunnel, and besides, the occurrence cause of cavity was analysed to design, construction and management cause. The filling method for cavity using filling material was comprehensively appling to cavity behind tunnel lining.

• 한국터널공학회:학술대회논문집
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• 한국터널공학회 2005년도 학술발표회 논문집
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• pp.117-128
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• 2005

This Paper present design parameters of grouting by reviewing several published equations and the results of coupled analysis considering the difference of permeability between soil and grouted zone. Also, the feasibility of couped analysis in the design of grouting is studied for seeping water quantity into tunnel, displacement of tunnel face, drawing down of groud water table, settlement of ground and stress of tunnel supports.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.545-548
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• 2008

In this study, the concept of safety impact assessment to achieve 'Design-for-Safety' in design phase is introduced. For this purpose, safety impact assessment model was devised and a methodology using the risk-based safety impact assessment approach for NATM of tunnel projects is suggested. The suggested methodology includes safety information survey, classification of safety impact factors caused by design and construction, and quantitative estimation of magnitude and frequency of safety impact factors. A real-world case study on the safety impact assessment of a tunnel construction project is also provided in the paper.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.1354-1363
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• 2006

Until now, NATM(New Austrian Tunneling Method) has been increasingly developed based on concept of making use of ground as support. Also, NATM in its essence is a method of risk based on monitoring behaviour of tunnel. This Monitoring is irreplaceable for the quality construction of tunnel, and safety of tunnel itself. Pre-reinforcement ahead of a tunnel face using long steel pipes in NATM, known as the RPUM(Reinforced Protective Umbrella Method), is the auxiliary method to sustain the stability of a tunnel face and reduce the ground settlements. Since design of RPUM has been dependent on the empirical design, it is necessary to develop the improved design methods. In this study, to understand behaviour of steel pipes, it is monitored displacement of tunnel crown, axial force of rock bolt, displacement and axial stress of steel pipes. Also, in order to clarify the mechanical behaviour and RPUM effects, 3-Dimensional numerical analysis is performed that various cases of different parameter combinations including original length and repeated length of steel pipes, installation width and angle, repeated length of steel. In the results of comparison monitoring with analysis, it is suggested more economical and efficient design technique than empirical design methods.

• 한국터널지하공간학회 논문집
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• 제8권3호
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• pp.249-257
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• 2006

지반 설계 인자는 공간적으로 분포하는 특성이 있으며, 이는 터널의 설계와 시공과정 뿐만 아니라 장기 거동에 큰 영향을 미친다. 그러나 일반적으로 터널의 수치해석을 위한 설계 지반 인자는 대상 영역을 대표하는 값 또는 대상 영역의 광역적 평균값 등이 적용되고 있다. 특히, 지하공간의 크기가 증가할수록 설계 지반 인자의 불확실성 및 공간적 분포 또한 증가한다. 결국 이러한 불확실성과 공간적 분포 특성의 확대는 해석의 정확성 및 신뢰성 저하를 초래하게 된다. 따라서, 대형 터널의 구조적 안정성을 확보하기위해 지반 물성치들의 공간적인 분포에 대한 정량적인 조사가 설계시 포함되어야 한다. 본 연구에서는 지반 물성치 및 구조적 설계 인자의 공간적 분포가 터널의 변위에 미칠 수 있는 영향을 분석하였다. 여러 COV(Coefficient of Variation)에 따라 정규분포하는 지반 물성치의 공간적 특성이 이상화된 원형 터널의 변위에 미치는 영향에 대한 분석과, NATM(New Austrian Tunneling Method) 터널에서 숏크리트의 강도의 공간적 분포가 터널 변위에 미치는 영향을 분석하였다. 공간적 분포의 COV가 증가할수록 터널 주변 발생하는 변위량도 증가하는 것으로 나타났으며, 분석 결과 이들은 지반 물성치에 따라 고유한 계수를 갖는 삼차방정식으로 표현된다.