• 대한안전경영과학회지
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• 제23권1호
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• pp.23-30
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• 2021

This paper analyzed a survey of 388 general target samples to analyze the correlation between disaster safety costs and human risk factor analysis and evacuation behavior due to tunnel accidents. Considering the impact of the tunnel accident on disaster safety costs and the correlation between human evacuation and risk factors in the tunnel environment, the system should be reorganized to reflect the tunnel's basic plan, tunnel cross-section, tunnel installation.

• 터널과지하공간
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• 제20권4호
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• pp.260-266
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• 2010

본 연구에서는 모형실험을 통한 2-Arch 터널의 거동과 주변지반의 거동으로부터 중앙부 Pilot 터널굴착 및 선행터널(우측터널)과 후행터널(좌측터널) 굴착에 따라 좌 우 터널 상호간에 미치는 영향을 분석하고자 하였으며, 보강영역의 상대강성비와 토피고에 따라 발생하는 원지반 이완영역 및 아칭효과에 의한 중앙필러 및 주변 지반의 하중전이 현상을 규명하고자 하였다. 이를 위하여 2-Arch 터널의 시공순서를 반영한 실험순서에 따라 모형실험을 수행하였으며, 보강영역의 강성 및 토피고를 변화시켜 이에 따른 2-Arch 터널의 변형 및 주변지반의 변위를 측정하였다.

• 한국구조물진단유지관리공학회 논문집
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• 제12권3호
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• pp.183-190
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• 2008

국가 중요시설물인 터널에 대한 유지관리업무는 관리주체별, 용도별, 터널 규모별로 각각 상이하게 수행되고 있다. 현재 각 관리주체별로 운영중인 국내 터널유지관리시스템을 분석해보면 수기 또는 초보적인 전산화만이 되어 활용도가 매우 저조한 것이 현 상태이다. 이에 본 연구에서는 터널의 계획, 설계, 시공 단계의 관련자료 뿐 아니라 보수 보강 이력 자료 등의 유지관리단계에서 조사된 여러 현장조사와 터널 스캐너에 의한 결과를 통합한 새로운 터널유지관리시스템을 구축하여 국내 여러 터널 현장에 적용한 후, 이의 적용성을 분석하였고, 터널 유지관리방법의 개선안을 제안하였다.

• Wind and Structures
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• 제28권4호
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• pp.203-213
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• 2019

The topography and geomorphology are complex and changeable in western China, so the railway transition section is common. To investigate the aerodynamic effect of the subgrade-tunnel transition section, including a cutting-tunnel transition section, an embankment-tunnel transition section and two typical scenarios for rail infrastructures, is selected as research objects. In this paper, models of standard cutting, embankment and CRH2 high-speed train with the scale of 1:20 were established in wind tunnel tests. The wind speed profiles above the railway and the aerodynamic forces of the vehicles at different positions along the railway were measured by using Cobra probe and dynamometric balance respectively. The test results show: The influence range of cutting-tunnel transition section is larger than that of the embankment-tunnel transition section, and the maximum impact height exceeds 320mm (corresponding to 6.4m in full scale). The wind speed profile at the railway junction is greatly affected by the tunnel. Under the condition of the double track, the side force coefficient on the leeward side is negative. For embankment-tunnel transition section, the lift force coefficient of the vehicle is positive which is unsafe for operation when the vehicle is at the railway line junction.

• Geomechanics and Engineering
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• 제10권4호
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• pp.471-526
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• 2016

In order to investigate water flow characteristics after inrushing in process of karst tunnel excavation, numerical simulations for five case studies of water inrush from the tunnel floor are carried out by using the FLUENT software on the background of Qiyueshan high risk karst tunnel. Firstly, the velocity-distance curves and pressure-distance curves are drawn by selecting a series of probing lines in a plane. Then, the variation characteristics of velocity and pressure are analyzed and the respective optimized escape routes are made. Finally, water flow characteristics after inrushing from the tunnel floor are discussed and summarized by comparing case studies under the conditions of different water-inrush positions and excavation situations. The results show that: (1) Tunnel constructors should first move to the tunnel side wall and then escape quickly when water inrush happens. (2) Tunnel constructors must not stay at the intersection area of the cross passage and tunnels when escaping. (3) When water inrush from floor happens in the left tunnel, if tunnel constructors meet the cross passage during escaping, they should pass through it rapidly, turn to the right tunnel and run to the entrance. (4) When water inrush from floor happens in the left tunnel, if there is not enough time to escape, tunnel constructors can run to the trolley and other equipment in the vicinity of the right tunnel working face. In addition, some rescuing equipment can be set up at the high location of the cross passage. (5) When water inrush from floor happens in the cross passage, tunnel constructors should move to the tunnel side wall quickly, turn to the tunnel without water inrush and run to the entrance. (6) When water inrush from floor happens in the cross passage, if there is not enough time to escape, tunnel constructors can run to the trolley and other equipment near by the left or the right tunnel working face. The results are of important practical significance and engineering value to ensure the safety of tunnel construction.

• 한국터널지하공간학회 논문집
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• 제3권4호
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• pp.35-55
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• 2001

최근 터널 구조물이 점차 노후화됨에 따라 터널의 안전성을 평가하기 위한 점검 및 진단이 많이 수행되고 있다. 그러나 터널구조물의 상태 및 안전성 평가에 대한 명확한 기준이 없어 조사자의 주관적인 판단에 의존할 수 밖에 없는 실정으로 이에 대한 체계적인 기준정립이 요구되고 있다. 또한 기존방법은 터널라이닝에 대한 평가에 많은 비중을 주고 있어 지반구조물로서의 터널특성을 제대로 반영하지 못하고 있으며, 상태평가요소과 터널등급산정과정이 체계적이지 못하여 이에 대한 보완이 필요하다 할 수 있다. 따라서 본 연구에서는 터널 상태 및 안전성 평가방법의 문제점을 개선하기 위한 새로운 터널구조물상태평가기준을 제시하였다. 본 기준은 국내외의 터널기준을 분석하여 상태평가요소를 선정하고 이를 점수화하였으며, 대표등급산정방법을 정량화하므로서 터널상태를 객관적으로 평가할 수 있도록 하였다. 본 기준과 방법은 터널구조물에 대한 상태평가에 객관성과 신뢰성을 확보하여 보다 효율적인 안전점검 및 진단업무에 활용될 수 있다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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• pp.561-564
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• 2007

This case was successfully constructed as a leakage prevention case of primary 2-arch tunnel located in Anyang, Gyungkido. The leakage of primary 2-arch tunnel was observed at middle wall of tunnel and girder of tunnel. Such a leakage of primary 2-arch tunnel generally occurred due to the damage of the waterproof membrane constructed on the middle wall during the blasting works of right and left tunnel after construction of the middle wall. As the leakage, icicles hanged from girder of tunnel in the winter. In such phenomenon, the risk of the traffic accident in the tunnel was high. In this case, leakage prevention works were successfully constructed using the heat insulated drainage.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 가을 학술발표회 논문집
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• pp.185-192
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• 1999

This paper presents the results of a parametric study on the behavior of tunnel face reinforced with horizontal pipes. A three-dimensional finite element model was adopted in this study to capture the three-dimensional nature of tunnel face behavior under various boundary conditions. A parametric study was peformed on a wide range of boundary conditions with emphasis on the effect of reinforcing layouts on the deformation behavior of tunnel face. The results of analysis such as tunnel face deformation behavior under various conditions were thoroughly analyzed, and a database for the behavior of tunnel face under different reinforcing conditions was established for future development of a semi-empirical design/analysis method for the tunnel face reinforcing technique. The results indicated that there exits an optimum reinforcing layout for a given tunnel condition, which must be selected with due consideration of tunnel geometry and ground condition.

• 터널과지하공간
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• 제7권3호
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• pp.230-237
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• 1997

As concrete structure is getting old and decrepit, its inspection and diagnosis is getting important. Therefore, it is necessary to estimate the soundness of structure using non-destructive tests for effective repairs and maintenances. But, applications of non-destructive tests in tunnel have been used restrictively, due to accessibility only from one side in tunnel lining and presence of tunnel installations. Recently, the various non-destructive techniques have been studied. Especially, ground penetrating radar(GPR) and impact echo (IE) methods have been researched for tunnel inspection. In this study, the applicability of impact echo test in tunnel lining inspection has been investigated. This paper described the tunnel inspection for lining thickness and internal flaw using impact echo tests. Model tests were carried out using impact echo test systems on two concrete models, Model I is measuring for lining thickness, Model II is detecting for internal flaw. Also, the test were applied for lining inspections in a tunnel constructed by NATM. From the results of impact echo tests, we have concluded that impact echo test is a very useful and effective technique for inspecting the concrete tunnel linings.

• Interaction and multiscale mechanics
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• 제1권1호
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• pp.157-175
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• 2008

A brief review of the research works on ground vibrations caused by trains moving in underground tunnels is first given. Then, the finite/infinite element approach for simulating the soil-tunnel interaction system with semi-infinite domain is summarized. The tunnel is assumed to be embedded in a homogeneous half-space or stratified soil medium. The train moving underground is modeled as an infinite harmonic line load. Factors considered in the parametric studies include the soil stratum depth, damping ratio and shear modulus of the soil with or without tunnel, and the thickness of the tunnel lining. As far as ground vibration is concerned, the existence of a concrete tunnel may somewhat compensate for the loss due to excavation of the tunnel. For a soil stratum resting on a bedrock, the resonance peak and frequency of the ground vibrations caused by the underground load can be rather accurately predicted by ignoring the existence of the tunnel. Other important findings drawn from the parametric studies are given in the conclusion.