• Title, Summary, Keyword: Road tunnel

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Road Traffic Noise in Tunnel (터널 내부의 도로교통소음)

  • 여운호;유명진
    • Journal of Environmental Health Sciences
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    • v.19 no.4
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    • pp.9-13
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    • 1993
  • This paper describes the impact of reflected sound in tunnel. The impact of reflected sound is obtained from making a comparision between measurements of tunnel and bridge. Sound level of tunnel is higher than that of bridge because reflected sound is generated in tunnel. Road traffic noise cannot be freely propagated because there are many buildings in urban. Therefore, a tunnel effect is generated in urban road. The impact of reflected sound is generated not only in tunnel, but also in urban road. This study provides the basic data for tunneling work and noise control strategy in urban road.

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A Study of Classification of Road Tunnel for Fire Safety (안전성 향상을 위한 도로터널 등급에 관한 연구)

  • Yoo, Ji-Oh;Rie, Dong-Ho;Shin, Hyun-Jun
    • Journal of the Korean Society of Safety
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    • v.20 no.3
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    • pp.112-119
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    • 2005
  • In road tunnel, in order to prevents an accident and minimize the damage of an accident in the case of fire, safety facilities and equipments are integral parts. The type and amount of safety facilities are based on tunnel type and length, traffic flow rate, etc. Therefore many countries use a tunnel classification system that categories tunnel into groups, and specifies the necessary emergency equipment for each group. In this study, for the purpose of classifying tunnel based on tunnel ist investigated the domestic and foreign standards and regulations for safety of road tunnel. As a results, we suggest the method of classification of tunnel by traffic performance, tunnel grade, the volume of traffic, fraction of HGV, rules or regulations for transports of dangerous good through tunnel.

Investigate on the rate of change of CO concentration in a tunnel under changed position of the jet fans by using numerical method (제트 팬 가동위치에 따른 장대터널 내 CO 농도 변화율에 대한 전산해석)

  • Min, Jae-Hong;Kim, Dae-Hyun;Chung, Jin-Taek
    • Proceedings of the KSME Conference
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    • pp.2765-2770
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    • 2008
  • The purpose of tunnel ventilation system for long road tunnels is to keep certain levels of Visibility Index and the concentration of CO. Additional equipments such as jet fans are used in road tunnel to discharge pollutants in the road tunnel. The control algorism of tunnel ventilation system takes the value of sensors as input, and then gives the operation method of jet fans in tunnel as output. Information on the variation of CO concentration in tunnel when jet fans are running is needed to minimize their operation time. Numerical analysis is used in this paper because of the difficulty of conducting experiments under standard condition for ventilation of road tunnel. The concentration of CO has been calculated by using 3-dimensional CFD under transient condition with speed of cars, quantity of air ventilation, and the results for various operation position of jet fans are compared.

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Effects of the Distance between Jet Fans on the Ventilation Performance in a Road Tunnel (제트홴의 이격거리에 따른 터널내 환기특성에 관한 수치적 연구)

  • Kim, Jung-Yup
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.4
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    • pp.25-30
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    • 2011
  • The jet fan is generally used to add thrust in the longitudinal ventilation system of road tunnel and the geometric conditions of jet fan such as the distance from tunnel wall have an effect on the performance of ventilation system. Numerical analyses on the flow in tunnel caused by operation of jet fan are presented to study the ventilation characteristics in tunnel. While the distance between jet fans in parallel installed in tunnel is changed 0.5 L/D to 3.0 L/D, the flowrate and mean velocity through tunnel are calculated for each cases. As the distance between jet fans increases, the flowrate through tunnel increases asymptotically and the momentum of tunnel flow is alike.

A numerical study on the ventilation characteristics of rainfall in road tunnel (강우변화를 고려한 도로터널의 환기특성에 관한 수치해석)

  • Lee, Ho-Hyung;Lee, Seung-Chul
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.3
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    • pp.341-351
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    • 2015
  • When rainfall occurred on road tunnel, that is likely to have influence upon ventilation force in the tunnels but the tunnels ventilation system did not consider factors of rainfall. Thus, this study investigated effects of rainfall upon ventilation force in the tunnels at no rainfall and changing of rainfall by 3 dimensional numerical method. Flow rate into road tunnels decreased as many as 52.34% at rainfall of 150 mm/hr, and pressure drop of road tunnel between entrance and exit decreased as many as 22.22%, so that rainfall had influence upon ventilation force in the tunnel. The number of necessary jet fan in road tunnels is 12 at no rainfall but, when rainfall of 80 mm/hr on road tunnels, the number of necessary jet fan in road tunnels is 16, when rainfall of 150 mm/hr on road tunnels, the number of necessary jet fan in road tunnels is 17. So, factor of rainfall should be considered at estimation of ventilation system of road tunnel.

The CO Gas Concentration Characteristics in a Sound Proof Road Tunnel According to the Upper Opening Installation Distance Interval (방음터널 내부의 상부배출구 간격에 따른 CO 농도분포 특성)

  • Park, Myung Sig
    • Journal of ILASS-Korea
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    • v.21 no.3
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    • pp.162-169
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    • 2016
  • When we construct a road near an apartment complex, we consider a soundproof wall. To make residential places quieter, we may consider a soundproof road tunnel. Such a tunnel, however, would become highly concentrated with soot from vehicles whenever a traffic jam might occur. To create an optimum design, this study utilizes the PHOENICS-VR software. The work considers three cases: (1) no openings (2) openings at 30m intervals, and (3) openings at 60m intervals on the upper side of the tunnel. The study finds that in the second case shows CO concentration distributions were 15% less than those without openings. And the CO concentration distributions of the second and third cases are almost the same. The findings suggest that we should make the soundproof tunnel to reduce construction fees.

Dynamic Model of the Road Tunnel Pollution by Neural Networks (신경망을 이용한 도로터널 오염물질 동적 모델)

  • 한도영;윤진원
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.9
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    • pp.838-844
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    • 2004
  • In a long road tunnel, a tunnel ventilation system may be used in order to reduce the pollution below the required level. To develop control algorithms for a tunnel ventilation system, a dynamic simulation program may be used to predict the pollution level in a tunnel. Research was carried out to develop better pollution models for a tunnel ventilation control system. A neural network structure was adopted and compared by using actual poilution data. Simulation results showed that the dynamic model developed by a neural network may be effective for the development of tunnel ventilation control algorithms.

Experimental Study on Minimum Distance between Tunnel and Interchange by Driving Simulator (터널 - IC 분기점간 최소이격거리 연구)

  • Lee, Jong-Hak;Noh, Kwan-Sub;Kim, Jong-Min
    • International Journal of Highway Engineering
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    • v.11 no.1
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    • pp.37-45
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    • 2009
  • The minimum distance between tunnel and interchange has several steps to go through for road users; when road user comes out of tunnel, he/she reads information on road sign and tries to change the lane, and then reaches the destination (interchange). So that's why that minimum distance between tunnel and interchange has to be designed to reflect human factors sufficiently for road's users. This study aims to set for minimum distance between tunnel and interchange with involved human factors. People aged from their twenties to their seventies took part in this experiment by using driving simulator. As a result, the minimum distance between them was loom long. When it comes to this study for minimum distance between tunnel and interchange, this study will be significant in some ways reason why this method can be applied to all road facilities for road safety on scientific basis. In the near future, It will make a recommendation concerning the most suitable data for road safety by contributing better guideline.

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Study on Optimization Technique for Design of the Road Tunnel Ventilation System (도로터널 환기시스템 설계 프로그램 개발)

  • 유지오;이동호;신현주
    • Journal of the Korean Society of Safety
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    • v.14 no.4
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    • pp.60-70
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    • 1999
  • In this study, the computer code for the optimal design of road tunnel ventilation system based on one-dimensional analysis of the air flow was developed. The control volume method was used to calculate the air velocities and the concentration distribution of pollutants(CO, NOx, Particulate) for various tunnel ventilation system. This code was validated by comparing the calculation results to the practical design data for the road tunnel ventilation system. The calculation results were in accord with the practical design data.

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A Cascade Control Algorithm for the CO Level Control of a Long Road Tunnel (터널 일산화탄소 농도 제어를 위한 직렬 제어 알고리즘)

  • Han Do Young;Yoon Jin Won
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.2
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    • pp.147-155
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    • 2005
  • For a long road tunnel, a tunnel ventilation system may be used in order to reduce the pollution level below the required level. To control the tunnel pollution level, a closed loop control algorithm may be used. The cascade control algorithm, which composed of a jet fan control algorithm and an air velocity setpoint algorithm, was developed to regulate the CO level in a tunnel. The verification of control algorithms was carried out by dynamic models developed from real tunnel data sets. The simulation results showed that control algorithms developed for this study were effective to control the tunnel ventilation system.