• Title, Summary, Keyword: double-deck tunnel

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A Study on site selection criteria and discharge capability evaluation for the multi-purpose use of a double-deck tunnel in a great depth (대심도 복층터널의 다목적 활용을 위한 입지선정 및 통수성능 평가)

  • Moon, Hoon-Ki;Kil, Ki- Oh;Song, In-Cheol;Lee, Hye-Yoon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.18 no.3
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    • pp.283-290
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    • 2016
  • Recent, the construction of the multi-purpose double-deck tunnel is required to solve the flood protection and congested area at urban city. The multi-purpose double-deck tunnel is desperately needed for the introduction of efficient utilization of underground space in addition to the main feature of road capabilities. A basic review was performed for site selection to consider the control capability and features of road tunnel at the same time, and the processable flow in accordance with tunnels cross section of double deck tunnel. Site Selection Criteria for multi-purpose use of the double-deck tunnel has been proposed through the site selection criteria by use of the tunnels review. Also the estimation processable flow was performed to review the versatility of double-deck tunnel due to design of tunnel cross-section. Site Selection of double-deck tunnel from this study can be seen the need for a complex consideration through a variety of analyzes.

Stability evaluation of a double-deck tunnel with diverging section

  • La, You-Sung;Kim, Bumjoo
    • Geomechanics and Engineering
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    • v.21 no.2
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    • pp.123-132
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    • 2020
  • Due to the various restrictions and problems related to the construction of new roads in urban areas, underground road construction has been receiving a great deal of attention in the field of tunnel engineering. In this study, a double-deck road tunnel with a diverging section was analyzed for the evaluation of its stability. Both numerical analysis and scale model tests were performed, the results were used to develop a stability evaluation method for double-deck tunnels with diverging sections constructed in rocks by NATM. From regression analyses conducted on the results of the numerical analysis, an equation and a chart were derived, these tools allow us to obtain the strength/stress ratio (SSR) for double-deck road tunnels with a diverging tunnel in various diverging conditions quickly and accurately. These tools have great potential to help engineers evaluate the stability of double-deck tunnels in the preliminary design stage.

Design Factors for the Ventilation System of a Networked Double-deck Tunnel (네트워크형 복층 터널 환기 시스템 설계 인자)

  • Park, Sang Hoon;Lee, Seung Jun;Park, Yo Han;Kim, Se Min;Roh, Jang Hoon;Yoo, Yong Ho;Kim, Jin
    • Tunnel and Underground Space
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    • v.26 no.1
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    • pp.32-45
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    • 2016
  • For effective utilization of downtown area, many studies about underground have been performed around the world, and double-deck tunnel have being operated in USA, Europe and China, etc. (A86 East Duplex in France, M30 tunnel project in Spain, SR-99 in seattle, USA, Yangtze river tunnel in China) In Korea, the research about network type double-deck tunnel in deep underground space is in progress to solve the traffic jam and secure the ground space. In this study, a number of factors required for double-deck tunnel in deep underground are analyzed through the existing ventilation design outline and unique ventilation design factors for network type double-deck tunnel are established by reviewing design cases of overseas double-deck tunnel.

A comparative study on the stability evaluation of double deck tunnel in terms of excavation (대심도 복층터널에 대한 굴착 안정성 평가 비교 연구)

  • Jang, Namju;Gang, Han-gil;Kim, Kihwan;Choi, Chang-rim
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.21 no.1
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    • pp.155-166
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    • 2019
  • It is necessary to construct underground in the metropolis. Road traffic has reached saturation point. The city has several underground road construction projects. In abroad, double deck tunnels are planned and constructed. It is attained a high level of underground development technology. In case the double deck tunnel (2 lane) is planed instead of the bidirectional tunnel (2 lane), excavation area is similar. But tunnel width is decreased. The reduced width can cut cost for the tunnel reinforcement. This study evaluates the stability of excavation on double deck tunnel. By the assessment of the strength-stress ratio and strength reduction method, quantitative analysis is conducted between double deck tunnel and the bidirectional tunnel.

Development of Fire Detection Algorithm for Video Incident Detection System of Double Deck Tunnel (복층터널 영상유고감지시스템의 화재 감지 알고리즘 개발)

  • Kim, Tae-Bok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.9
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    • pp.1082-1087
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    • 2019
  • Video Incident Detection System is a detection system for the purpose of detection of an emergency in an unexpected situation such as a pedestrian in a tunnel, a falling object, a stationary vehicle, a reverse run, and a fire(smoke and flame). In recent years, the importance of the city center has been emphasized by the construction of underpasses in great depth underground space. Therefore, in order to apply Video Incident Detection System to a Double Deck Tunnel, it was developed to reflect the design characteristics of the Double Deck Tunnel. and In this paper especially, the fire detection technology, which is not it is difficult to apply to the Double Deck Tunnel environment because it is not supported on existing Video Incident Detection System or has a fail detect, we propose fire detection using color image analysis, silhouette spread, and statistical properties, It is verified through a real fire test in a double deck tunnel test bed environment.

Numerical study on the connection type of inner-slab in double deck tunnel (복층터널 내부슬래브의 연결형식에 관한 수치해석적 연구)

  • Lee, Ho-Seong;Moon, Hyun-Koo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.18 no.5
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    • pp.441-451
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    • 2016
  • This study analyzed behavior of the segment lining considering connection type between inner-slab and segment lining for a double deck tunnel by Shield TBM. In order to establish the design requirements of inner-slab and segment lining in double deck tunnel, inner structure of double deck tunnel at each purpose was analyzed and compared connection type between inner-slab and segment lining. And analyses have been carried out through the beam-spring model by MIDAS Civil 2012. As a result of this study, inner-slab, connection type of between inner-slab and segment lining and Lateral earth pressure coefficients were analyzed to verify the significant design factors.

The National Highway, Expressway Tunnel Video Incident Detection System performance analysis and reflect attributes for double deck tunnel in great depth underground space (국도, 고속국도 터널 영상유고감지시스템 성능분석 및 대심도 복층터널 특성반영 방안)

  • Kim, Tae-Bok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.7
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    • pp.1325-1334
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    • 2016
  • The video incident detection System is a probe for rapid detecting the walker, falling, stopped, backwards, smoke situation in tunnel. Recently, the importance is increases from the downtown double deck tunnel in great depth underground space[1], but the legal basis is weak and the vulnerable situation experimental data. So, In this paper, we introduce a long-term log data analysis information in the tunnenl video incident detection system installed and experimental results in order to verify the feasibility of apply to video incident detection system for the double deck tunnel. It is proposed a few things about derives the problem of existing video incident detection system, improvements and reflect attributes for double deck tunnel. The contents described in this paper will contribute to refine the prototype of video incident detection system will apply to future double deck multi-layer tunnels.

A Case Study on M & E Design for Double-Deck Tunnel in Urban Area (도심지 대심도 복층터널의 환기 및 방재계획)

  • Byun, Sang-Hun;Jeong, Jae-Ho;Jun, Duk-Chan;Shin, Il-Jae;Sim, Dong-Hyun
    • Tunnel and Underground Space
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    • v.21 no.4
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    • pp.281-286
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    • 2011
  • The west underground express way is a recent initiated BTO (Build-Transfer-Operate) project for releasing heavy traffic of the existing west express way which is notorious on-ground road for extremely traffic stuck area in the west of Seoul, South Korea. The new express way for light vehicles is the first double-deck tunnel ever designed in South Korea and 10.91 km long including both open cut structures and concrete lining with middle-deck in bored tunnel. Because the new express way is going through underground of heavily populated area, mechanical & electrical design for the safety of drivers in tunnel is one of the most important parts among many design issues. This paper discusses M & E design focuses including ventilation-evacuation plan and various safety facilities.

Development of Mechanical Construction Method of Road Deck Middle Slab of Double Deck Tunnel in Great Depth (대심도 복층터널 중간슬래브의 기계화 시공법 개발)

  • Lee, Doo Sung;Kim, Young Jin;Kim, Tae Kyun;Kim, Chang Yeong
    • Journal of The Korean Society of Civil Engineers
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    • v.39 no.3
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    • pp.451-460
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    • 2019
  • It is critical for Korea to make effective use of limited space as it has dense population and high traffic volume compared to its terrestrial area. To resolve this issue, diverse types of underground structures have increasingly been applied so far, and one of the most representative structures is double-deck tunnel. The construction period of the middle slab in the double deck tunnel constructed at the great depth can be considered as an important part after the tunnel lining construction in the whole process. In order to minimize the construction period required for construction of the middle slab in the double deck tunnel, it was proposed a method of the precast intermediate slab. In this study, it is suggested a mechanical construction process with dedicated equipments developed to improve the safety and the workability of erection of the precast middle slab than the current construction method using the existing mobile crane.

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.