• Title/Summary/Keyword: 노후터널

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A study on development of the high-flowable filling material and application in the old tunnel (터널 배면공동 뒤채움재 개발과 노후터널의 적용에 관한 연구)

  • Ma, Sang-Joon;Seo, Kyoung-Won;Bae, Gyu-Jin;An, Sang-Chul;Im, Kyung-Ha
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.4 no.3
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    • pp.195-205
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    • 2002
  • Most tunnel damage such as cracks or leakage which exist in tunnel liner commonly, is caused by the cavities that exist behind the tunnel liner, through the tunnel safety inspections. These cavities were analysed to check if they affect the stability of tunnels. This study is on the development of the controlled low-strength and flowable filling material which an be applied to the cavity behind the tunnel lining. The backfilling material studied here is crushed sand and stone-dust which is in cake-state and is a by-product obtained in the producing process of aggregate. Varying the compound mixing ratio, laboratory tests of compression test and chemical analyses were carried out. In addition, the material was applied to an old tunnel for the performance assessment.

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A Study on the Lining Stability of Old Tunnel Using Groundwater Flow Modelling and Coupled Stress-Pore Water Pressure Analysis (지하수 유동과 응력-간극수압 연계 해석을 통한 노후터널의 라이닝 안정성 분석)

  • Kim, Bum-Joo;Jung, Jae-Hoon;Jang, Yeon-Soo;Chun, Byung-Sik
    • Journal of the Korean Geotechnical Society
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    • v.28 no.4
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    • pp.101-113
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    • 2012
  • The degradation of a tunnel drainage system leads to increases in pore water pressure around the tunnel and the lining stress, which results in affecting the tunnel stability. In the present study of the Namsan 3th tunnel, more than 30 year old tunnel, the effects of the drainage performance reduction due to drain hole clogging on the tunnel lining stability were investigated by examining pore water pressure distribution around the tunnel and the lining stresses through numerical analysis. Groundwater flow modeling on the Mt. Namsan region was done first and 3D seepage and coupled stress-pore water pressure finite element analysis were performed on the tunnel using the results of the groundwater flow modeling. The pore water pressure distribution and the tunnel lining stresses could be predicted using a drain hole outflow data measured in the tunnel site. This analysis method may be used to evaluate the current stability of old tunnels for which in most cases field investigations and related information are not readily available.

Deterioration Evaluation of Railway Line Segments Using Analytic Hierarchy Process (AHP를 활용한 철도선로구간 노후도 평가)

  • Kim, Seong-Ho
    • Journal of the Korean Society for Railway
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    • v.14 no.6
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    • pp.569-574
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    • 2011
  • An effective approach to distributing budget to railway line facility improvement is to use investment priorities of railway line segments based on their deterioration. In this paper we present an evaluation method of railway line segment deterioration which can be used to distribute limited budget. Railway line facilities include rail track, railroad switch, subgrade, bridge, tunnel. These facilities and line shape can affect line segment deterioration. Deterioration evaluation method we present is a weighted sum of each component deterioration scores. The component weight can be obtained from experts using analytic hierarchy process.

Longitudinal Deformation Characteristics during Excavation of a old Tunnel in Operation (노후터널의 운영중 터널확대시 지반종단변형특성에 관한 연구)

  • Baek, Ki-Hyun;Kim, Woong-Ku;Seo, Kyoung-Won;You, Dong-Woo
    • Journal of the Korean Geotechnical Society
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    • v.27 no.11
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    • pp.47-54
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    • 2011
  • In this paper, longitudinal behaviors of a tunnel with respect to various conditions are analyzed, and a new equation of longitudinal deformation curve during tunnel expansion is proposed. Finally, the range of protection by a protector is investigated using the proposed equation. To achieve the objectives, numerical analysis according to the ground and expansion conditions is performed. The results show that the range of protection, when a 2 traffic lane tunnel is expanded to 4 traffic lanes, should cover at least 24m to backward and 35m forward.

Effect of Leakage on Deterioration of Concrete Lining Structure (콘크리트 라이닝 구조물의 누수에 의한 열화특성)

  • Jung, Ho-Seop;Kim, Dong-Cyou;Kim, Seong-Soo;Park, Kwang-Pil
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.287-288
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    • 2009
  • In this study, the degree of deterioration on the tunnel lining concrete due to crack and leakage was evaluated by field-investigating the conventional tunnels constructed a long time ago. By examining the exterior, conducting the non-destructive test and collecting cores for the tunnel concrete linings, this study evaluated the compressive strength and the permeability, and also performed instrumental analyses.

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Evaluation of Performance on the Slag Mortars with Accelerator (급결제를 첨가한 고로슬래그 모르타르의 성능평가)

  • Park, Kwang-Pil;Kim, Seong-Soo;Kim, Dong-Gyou;Jung, Ho-Seop;Lee, Seung-Tae;Lee, Jeong-Bae
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.515-516
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    • 2009
  • Recently, A lot of roads, railroads and tunnels are constructed for development of industrialization and efficient use of national land. So, we have focused on to figure out the best combination between Slag powder and Mortars with Accelerator to repair of tunnel structure.

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A Study on Development of Lightweight Foam Filling Material for the Voids behind Tunnel Liner using Stone-dust and Application to the Old Tunnel (석분을 이용한 터널 뒤채움용 경량기포 충전재의 개발과 현장적용에 대한 연구)

  • Ma, Sang-Joon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.7 no.4
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    • pp.139-147
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    • 2003
  • The most tunnel damage such as cracks or leakage which exist in tunnel lining commonly, is caused by the voids where exist behind the tunnel lining, through the tunnel safety inspections. These voids were analysed to affect to a stability of a running-tunnel seriously. The aim of this paper is to develope the lightweight foam concrete for tunnel backfilling material using stone-dust of cake state and to apply the lightweight foam concrete developed to the old tunnel. This paper shows the basic properties of lightweight foam concrete mixed with stone-dust including flow rate, unit volume weight, absorption rate and compressive strength. In addition, according to the designed compound ratio, the lightweight foam concrete was applied to the ASSM tunnel for an application assessment. The engineering application of the lightweight foam concrete as the old tunnel's backfilling material was confirmed in this assessment.

A Field Evaluation of Calcium Carbonate Scale Prevention using Molecular Vibration in Subway Tunnels (분자진동을 이용한 스케일 방지 기술의 지하철 터널 내 현장적용성 평가)

  • Park, Eunhyung;Chu, Ickchan;Lee, Jonghwi;Kim, Hyungi;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.12
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    • pp.27-33
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    • 2012
  • The purpose of this study is to evaluate the field applicability of Quantum Stick in scale deposit prevention for subway tunnels in Seoul. This technology was installed into drainpipes and its performance was monitored through occasional site visits. SEM and EDS were also performed on scale collected from these drain pipes. Results showed a decrease in scale deposits due to Quantum Stick treatment. In the field test, the device was found to be effective in preventing scale formation in new pipes as well as reducing existing scale in previously installed pipes. However, further investigations are necessary to account for various environmental conditions. In conclusion, the results indicate that molecular Vibration technology is effective in suppressing scale formation.

The Control Method of Scale in Drainage Pipe of Deteriorated Tunnel used Magnetic Field and Quantum Stick (자화장치와 퀀텀스틱을 이용한 노후터널의 배수공내 침전물 방지 방법)

  • Nam, Joongwoo;Lee, Changgi;Lee, Jonghwi;Do, Jongnam;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.12 no.11
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    • pp.59-64
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    • 2011
  • Clogging in drainage pipe is one of the important problems, so it needs a remedy urgently. Recently, scale in drainage pipe is removed by water jet cleaning and other treatment. But these treatments need much cost and regular management. The principal component of scale in drainage pipe is $CaCO_{3}$. It was observed the setting of $CaCO_{3}$ by some kind of analysis such as SEM, XRD, visual and weight measuring analysis to solve these problems and prevent setting formation in drainage pipe. As a result, in case of magnetic, particle shape of $CaCO_{3}$ is changed Aragonite from Calcite. Also in case of Quantum Stick, the amount of scale is reduced by expert inspector's result. As a whole, Magnetic treatment and Quantum Stick have the effect for protecting of scale precipitation.