• Title, Summary, Keyword: Tunnel cross-section type

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The study on interval calculation of cross passage in undersea tunnel by quantitative risk assesment method (해저철도터널(목포-제주간) 화재시 정량적 위험도 평가기법에 의한 피난연결통로 적정간격산정에 관한 연구)

  • Yoo, Ji-Oh;Kim, Jin-Su;Rie, Dong-Ho;Shin, Hyun-Jun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.3
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    • pp.249-256
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    • 2015
  • Quantitative Mokpo-Jeju undersea tunnel is currently on the basis plan for reviewing validation. As for the cross section shape for express boat of 105 km line, sing track two tube is being reviewed as the Euro tunnel equipped with service tunnel. Also, 10 carriage trains have been planned to operate 76 times for one way a day. So, in this study, quantitative risk assessment method is settled, which is intended to review the optimal space between evacuation connection hall of tunnel by quantitative risk analysis method. In addition to this, optimal evacuation connection hall space is calculated by the types of cross section, which are Type 3 (double track single tube), Type 1 (sing track two tube), and Type 2 (separating double track on tube with partition). As a result, cross section of Type 2 is most efficient for securing evacuation safety, and the evacuation connection space is required for 350 m in Type 1, 400 m in Type 2, and 1,500 m in Type3 to satisfy current domestic social risk assessment standard.

Investigation of soil behaviour due to excavation below the grouped pile according to shape of tunnel station (터널 정거장 형상에 따른 군말뚝 하부 굴착 시 지반거동 연구)

  • Kong, Suk-Min;Oh, Dong-Wook;Lee, Jong-Hyen;Lee, Yong-Joo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.1
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    • pp.83-97
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    • 2018
  • Tunnels are widely used for special purposes including roads, railways and culvert for power transmission, etc. Its cross-section shape is determined by uses, ground condition, environmental or economic factor. Many papers with respect to behaviours of adjacent ground and existing structure tunnelling-induced have been published by many researchers, but tunnel cross-section have rarely been considered. A collapse of tunnel causes vaster human and property damage than structures on the ground. Thus, it is very important to understand and analyse the relationship between behavoiurs of ground and cross-section type of tunnel. In this study, the behaviour of ground due to tunnel excavation for underground station below the grouped pile supported existing structure was analysed through laboratory model test using a trap-door device. Not only two cross-section types, 2-arch and box, as station for tunnel, but also, offset between tunnel and grouped pile centre (0.1B, 0.25B, 0.4B) are considered as variable of this study. In order to measure underground deformation tunnelling-induced, Close Range Photogrammetry technique was applied with laboratory model test, and results are compared to numerical analysis.

A study on the selection of optimal cross section according to the ventilation system in TBM road tunnels (TBM 도로터널의 환기방식에 따른 최적단면 선정에 관한 연구)

  • Lee, Ho-Keun;Kang, Hyun-Wook;Kim, Hyun-Soo;Kim, Hong-Moon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.15 no.2
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    • pp.135-148
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    • 2013
  • Recently, road tunnels have become longer and the plans for long and deep road tunnel have been underway in urban areas. These long and deep tunnel excavations include NATM and TBM. Shield TBM is applied to around 80% of traffic tunnels in Europe, and approximately 30% of them in other developed countries. However, as much of equipment is imported from foreign countries at high prices and distribution rate of TBM tunnel is considerably low in Korea, NATM excavation method is commonly used. To increase TBM tunnel, it is necessary to do assure economic feasibility with the supply-demand of TBM equipment. For this, the selection of standardized TBM diameter is urgently needed. Therefore, the study aims to estimate the standardized optimum section properties of TBM by examining TBM excavation cross section utilization depending on the volume of traffic, the number of lane and its cross-section type(single or double deck), and ventilation system.

Conceptual Study of a Low-Speed Wind Tunnel for Performance Test of Wind Turbine (풍력터빈 성능시험을 위한 저속풍동 개념연구)

  • Kang, Seung-Hee
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.19 no.4
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    • pp.24-29
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    • 2011
  • Conceptual study of an open-circuit type low-speed wind tunnel for performance test of wind turbine blade and airfoil is conducted. The tunnel is constituted of a settling chamber, a contraction, closed test section, a diffuser, two corners, a cross leg and a fan and motor. For the performance test, the closed test section width of 1.8 m, height of 1.8 m and length of 5.25 m is selected. The contraction ratio is 9 to 1 and maximum speed in the test section is 67 m/sec. Input power in the tunnel is about 238 kW and its energy ratio is 3.6. The wind tunnel designed in present study will be an effective tool in research and development of wind turbine and airfoil.

A study on the characteristics of Micro Pressure wave for the optimum cross-section design in Honam high speed railway (호남고속철도 터널 단면선정을 위한 미기압파 특성 분석에 관한 연구)

  • Kim, Seon-Hong;Mun, Yeon-O;Seok, Jin-Ho;Kim, Gi-Rim;Kim, Chan-Dong;Yu, Ho-Sik
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • pp.51-68
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    • 2008
  • When the train enters into a tunnel a high speed, pressure waves are generated inside the tunnel. The pressure waves at propagate in a form of compression wave toward the tunnel exit and a fraction of the compression waves that arrives at the exit of the tunnel are discharged to outside of the tunnel and the remainder is reflected into the tunnel as expansion waves. The compression waves emitted from the tunnel does not radiate in a specific direction but in all directions. If the amplitude of the compression wave is great, it causes noise and vibration, and it is called "Micro-Pressure Wave." "Micro-Pressure Wave" must be considered as a decision for the optimum tunnel cross-section as the amplitude of the compression wave depends on train speed, tunnel length, area of tunnel and train. Therefore, this paper introduces the case study of Micro-Pressure Wave characteristics for determination of tunnel cross section in Honam high speed railway, the pressure inside the tunnel and the micro-pressure waves at tunnel exit were measured at Hwashin 5 tunnel in Kyungbu HSR line. At the same time. a test of train operation model was performed and then the measurement results and test results were compared to verify that the various parameters used as input conditions for the numerical simulations, which were appropriate. Also a model test was performed, in order to analysis of the Micro-Pressure Wave Mitigation Performance by Type of Hood at Entrance Portal.

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Development of optimal cross-section design methods for bored utility tunnels: case study of overseas typical cross-sections and design criteria (터널식 공동구 최적단면 설계기술 개발: 해외 표준단면 사례 및 설계기준 분석)

  • Park, Kwang-Joon;Yun, Kyoung-Yeol
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.6
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    • pp.1073-1090
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    • 2018
  • Since the domestic utility tunnels were built mainly in the development project of the new city, they are all in the form of cut-and-cover box tunnel. But, in the case of overseas construction of utility tunnels for existing urban areas, the bored tunnel types are mainly adopted. It is reasonable to install bored tunnels in a downtown area because it is difficult to block the roads or install bypass roads due to heavy traffic and civil complaints. In order to activate the utility tunnels in bored type, it is necessary to secure optimized cross-sectional design technology considering the optimal supplying capacity and mutual influencing factors (Thermal Interference, electrolytic corrosion, efficiency of the maintenance, etc.) of utilities (power cables, telecommunication cables, water pipes, etc.). The optimal cross-section design method for bored utility tunnels is ultimately to derive the optimal arrangement technique for the utilities. In order to develop the design methods, firstly, the cases of tunnel cross-section (Shield TBM, Conventional Tunneling) in overseas shall be investigated to analyze the characteristics of the installation of utilities in the section and installation of auxiliary facilities, It is necessary to sort out and analyze the criteria related to the inner cross-section design (arrangement) presented in the standards and guidelines.

Three Dimensional Characteristics of the Airflow in Unidirectional Vehicle Tunnels

  • Kim, Sang-Hyun;Kim, Doo-Young;Choi, Pan-Gyu;Lee, Chang-Woo
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • pp.287-300
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    • 2008
  • Airflow distributions along tunnel and over the cross section are critical in selecting installation location of the velocity monitor to obtain the representative data for ventilation as well as fire safety systems. This paper aims at performing CFD and on-site studies to analyze the longitudinal and cross-sectional distributions of the air velocity in tunnels employing longitudinal and semi-transversal ventilation systems. This study can ultimately contribute to selecting the monitor type as well as the optimal installation locations in vehicle tunnel.

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Conceptual Design Study of a Low-Speed Wind Tunnel for Performance Test of Wind Turbine (풍력터빈 성능시험을 위한 풍동 개념연구)

  • Kang, Seung-Hee;Choi, Woo-Ram;Kim, Hae-Jeong;Kim, Yong-Hwi
    • 한국신재생에너지학회:학술대회논문집
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    • pp.431-434
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    • 2009
  • Conceptual study of an open-circuit type low-speed wind tunnel for test of wind turbine blade is conducted. The tunnel is constituted of a settling chamber, a contraction, closed and open test sections, a diffuser, two corners, a cross leg and a fan and motor. For the performance test, the closed test section width of 1.8 m, height of 1.8 m and length of 5.25 m is selected. The open test section with dimension width of 1.8 m, height of 1.8 m and length of 4.14 m is adopted for aeroacoustic test. The contraction ratio is 9 to 1 and maximum speed in the closed test section is 67 m/sec. Input power in the tunnel is about 238 kW and its energy ratio is 3.6. The wind tunnel designed in present study will be an effective tool in research and development of wind turbine.

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A Numerical Analysis on the Determination of Shock Loss Coefficient at Flared Intersection of Network-type Double-deck Road Tunnel (네트워크형 복층 도로터널 확폭구간에서의 충격손실 계수 결정을 위한 수치해석 연구)

  • Park, Yo Han;Lee, Seung Jun;Kim, Jin
    • Tunnel and Underground Space
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    • v.28 no.1
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    • pp.111-124
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    • 2018
  • The purpose of this study is to analyze ventilation design factor for network-type double-deck road tunnel that have been developed actively around the world. A numerical analysis was carried out through computational fluid dynamics (CFD) to derive shock loss coefficient that occurs due to the change in cross sectional area at both merging section and diverging section. The model used for the numerical analysis is real-scale model and the reliability of the result is secured by comparing with the coefficient of the previous studies. As a result of this study, shock loss coefficient was calculated depending on the change in cross-sectional area ratio and was higher than the result of previous studies in case of both merging section and diverging section. It is considered that the characteristics of the geometrical structure of network-type double-deck road tunnel have a great impact on shock loss coefficient. Therefore, the result of this study is expected to be helpful for more accurate ventilation design of network-type double-deck road tunnel.

3D numerical investigation of segmental tunnels performance crossing a dip-slip fault

  • Zaheri, Milad;Ranjbarnia, Masoud;Dias, Daniel
    • Geomechanics and Engineering
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    • v.23 no.4
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    • pp.351-364
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    • 2020
  • This paper numerically investigates the effects of a dip-slip fault (a normal or a reverse fault) movement on a segmental tunnel which transversely crosses either of this kind of faults. After calibration of the numerical model with results from literature of centrifuge physical tests, a parametric study is conducted to evaluate the effects of various parameters such as the granular soil properties, the fault dip angle, the segments thickness, and their connections stiffnesses on the tunnel performance. The results are presented and discussed in terms of the ground surface and tunnel displacements along the longitudinal axis for each case of faulting. The gradient of displacements and deformations of the tunnel cross section are also analyzed. It is shown that when the fault dip angle becomes greater, the tunnel and ground surface displacements are smaller, in the case of reverse faulting. For this type of fault offset, increasing the tunnel buried depth causes tunnel displacements as well as ground surface settlements to enhance which should be considered in the design.