• Title, Summary, Keyword: A drainage type tunnel

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Case Study on defects of Tunnel Drainage in Subway (지하철의 터널 배수체계에 따른 결함 사레)

  • Kim Suk-Cho;Lee Jae-Uk;Cho Sung-Woo;Shin Yong-Suk
    • 한국터널공학회:학술대회논문집
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    • pp.292-298
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    • 2005
  • Tunnel in subway should be designed as a water-proof type tunnel as much as possible but it is difficult to make it come true due to several facts, such as construction technique and cost. A drainage type tunnel as a substitute of a water-proof tunnel lead to the increase of water pressure on the concrete lining that make bad effect to tunnel structure when it has some problem to operate the drainage system. Throughout studying about cases on defects of tunnel drainage in subway We hope it contributes to tunnel maintenance.

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Assessment of lining load for drainage type cable tunnel considered water-passing capacity of tunnel filter material (부직포 통수능을 고려한 배수형 전력구터널의 라이닝 하중산정)

  • Kim, Dae-Hong;Kim, Kyoung-Yul;Lee, Dae-Soo
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1369-1376
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    • 2005
  • In case of the drainage type tunnel, the residual water pressure is likely to act on the tunnel lining due to the decrease of water-passing capacity of the filter material. Therefore, this study discussions a method to predict the lining load with the consideration of water passing capacity of the filter material through the literature review and numerical analysis. It is expected from the results of case studies that the design load acting on the concrete lining in the drainage type tunnel could be assumed to be about 50% of the hydrostatic water pressure in steady-state ground-water condition.

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Design and Construction of Bottom Drainage Tunnel and the Watertight Tunnel (배수형 터널과 방수형 터널의 설계와 시공)

  • Kim, Seung-Ryeol;Park, Gwang-Jun;Park, Bong-Gi
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.49-58
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    • 1993
  • Reappraisal of the design and the construction concept of the bottom drainage tunnel has been made through the seepage analysis. An appropriate design approach for this tunnel has also been proposed. It was revealed from this study that water pressures acting on the concrete lining in the bottom dralnage tunnel much depend on the permeability of the surrounding ground, the source of water supply and the discharge capacity of dralnage facilities. The full release of these water pressures by the current drainage system could not be expected if this type of tunnel is constructed in the ground including alluvial deposits having a high permeability. The necessity of a proper reinforcement of the concrete lining or a modification of its shapes corresponding to the water pressure has been suggested.

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Effect of Seepage Forces on the Tunnel Face Stability - Assessing through Model Tests - (침투력이 터널 막장의 안정성에 미치는 영향 연구 - 모형실험을 중심으로 -)

  • 이인모;안재훈;남석우
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.41-48
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    • 2001
  • In this study, two factors are simultaneously considered for assessing tunnel face stability: one is the effective stress acting on the tunnel face calculated by upper bound solution; and the other is the seepage force calculated by numerical analysis under the condition of steady-state groundwater flow. The seepage forces calculated by numerical analysis are compared with the results of a model test. From the results of derivations of the upper bound solution with the consideration of seepage forces acting on the tunnel face, it could be found that the minimum support pressure for the face stability is equal to the sum of effective support pressure and seepage pressure acting on the tunnel face. Also it could be found that the average seepage pressure acting on the tunnel face is proportional to the hydrostatic pressure at the same elevation and the magnitude is about 22% of the hydrostatic pressure for the drainage type tunnel and about 28% for the water-proof type tunnel. The model tests performed with a tunnel model had a similar trend with the seepage pressure calculated by numerical analysis. From the model tests it could be also found that the collapse at the tunnel face occurs suddenly and leads to unlimited displacement.

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Assessment of Acid Rock Drainage Production Potential and Damage Reduction Strategy: A Case Study of Tunnel Construction Area (암석의 산성배수 발생개연성 평가 및 피해저감대책: 터널건설예정구간 사례)

  • Kim, Jae-Gon;Lee, Jin-Soo;Kim, Tong-Kwon
    • Economic and Environmental Geology
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    • v.41 no.3
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    • pp.335-344
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    • 2008
  • The acid rock drainage (ARD) production potential of rock was assessed for a tunnel construction area, Kimhae and the damage reduction strategy was discussed based on the ARD risk evaluation. The geology of the studied area consisted of Mesozoic quartz porphyry, sandstone, tuff and granite. Sulfides occurred as a disseminated type in quartz porphyry and granite, and a vein type in sandstone. Quartz porphyry and sandstone with a high content of sulfide were classified as a potentially ARD forming rock. The drainage originated from those rocks may acidify and contaminate the surrounding area during the tunnel construction. Therefore, the drainage should be treated before it is discharged. A slope stability problem due to the ARD was also expected and the coating technology was recommended for the reduction of ARD generation before the application of supplementary work for enhancing slope stability such as shotcrete and anchor. From the ARD risk analysis, those rocks should not be used as aggregate and be used as bank fill material with the system for the minimum contact with rain water and ground-water.

Laboratory Test of Molecular Vibration for Preventing Drainage Pipe Blockage in Deteriorated Tunnel (분자진동을 이용한 터널 배수공 막힘 억제의 실내시험 연구)

  • Yoon, Se-Hwan;Park, Eun-Hyung;Lee, Jong-Hwi;Chun, Byung-Sik
    • Journal of the Korean Geotechnical Society
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    • v.28 no.10
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    • pp.69-77
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    • 2012
  • Clogging of drainage pipes by scale is an important problem in civil engineering works. Although scale deposits can be removed by acid treatment or water jetting, these treatments are costly and have many disadvantages. In this study, scale samples from tunnel drainage pipes were analyzed using SEM-EDS and XRD. The main ingredient in scale was $CaCO_3$ of the calcite crystal form. Drainage experiments and recirculation type experiments were conducted to control and remove scale deposits, which were determined through visual and weight measuring analysis. As a result, Quantum Stick has the effect of limiting formation of scale.

A Study on the Mechanical Characteristics of Tunnel Structures and Ground Behavior by Synthetic Analysis Method with Tunnel Monitoring Results used (터널의 계측결과 종합분석에 의한 지반의 거동 및 터널 구조체의 역학적 특성 연구)

  • Woo, Jong-Tae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.7 no.3
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    • pp.115-124
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    • 2003
  • In this study, the relationships between the displacement and stress of the tunnel using various analysis methods were compared with monitoring results carried out during construction and maintenance monitoring. The behavior of tunnel were measured in the subway tunnel passing comparative soft the weathering and analyzed both security and mechanical characteristics of the tunnel lining. With the results of simplified monitoring observed in top heading and bench excavation tunnel, it is confirmed that the crown settlement is larger than the surface settlement. it is interesting to note that the crown settlement and the crown shotcrete lining stress are widely used monitoring items for the back analysis. It is analyzed that the residual water pressure applied in the drainage type tunnel is reasonable.

The design of outlet in inter-cross slope with tunnel which it applied forming artificial ground (인공지반을 적용한 사교하는 사면에서의 터널 갱구부 설계)

  • Park, Chal-Sook;Kwan, Han;Lee, Kyu-Tak;Kim, Bong-Jae;Yun, Yong-Jin;Kim, Kwang-Hee
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1532-1548
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    • 2008
  • The tunnel type spillways is under construction to increasing water reservoir capacity in Dae-am dam. The tunnel outlet was planned to be made after installing slope stabilization system on natural slope there. Generally, the tunnel outlet is made perpendicularly to the slope, but in this case, it had to be made obliquely to the slope for not interrupting flow of river. Because of excavation in condition of natural slope caused to deflecting earth pressure, the outlet couldn't be made. So, artificial ground made with concrete that it was constructed in the outside of tunnel for producing the arching effect which enables to make a outlet. We were planned tunnel excavation was carried out after artificial ground made. Artificial ground made by poor mix concrete of which it was planned that the thickness was at least 3.0m height from outside of tunnel lining and 30cm of height per pouring. Spreading and compaction was planned utilized weight of 15 ton roller machine. In order to access of working truck, slope of artificial ground was designed 1:1.0 and applied 2% slope in upper pert of it for easily drainage of water. In addition to, upper pert of artificial ground was covered with soil, because of impaction of rock fall from upper slope was made minimum. The tunnel excavation of the artificial ground was designed application with special blasting method that it was Super Wedge and control blasting utilized with pre-percussion hole.

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Study on long-term monitoring of heat exchanger installed in the tunnel lining (터널 라이닝 내부에 설치한 열교환기의 현장모니터링 연구)

  • Lee, Chulho;Park, Moonseo;Choi, Hangseok;Sohn, Byunghu;Jeoung, Jaehyeung
    • 한국신재생에너지학회:학술대회논문집
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    • pp.195.1-195.1
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    • 2011
  • This paper presents an experimental study on a new potential geothermal energy source obtained from tunnel structures. An "energy textile", which is a textile-type ground heat exchanger, was fabricated between a shotcrete layer and a guided drainage geotextile in the tunnel lining system. To examine the long-term thermal behavior of the energy textile, the difference in temperatures of the inlet and outlet fluid circulating through the heat exchange pipe within the energy textile was monitored using a constant-temperature water bath. Daily heat exchange rate of the energy textile during cooling operation was estimated from the measured temperatures of the inlet and outlet fluid through the energy textile. The air and ground temperature was also continuously monitored. The operation of the energy textile as a ground heat exchanger was simulated using a 3D numerical CFD model (Fluent). The thermal conductivity of shotcrete and concrete lining components and temperature variation of air in the tunnel were incorporated in the model. The numerical analysis shows a good agreement with the long-term monitoring result.

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Slope stability method establish and carry out in vertical slope for tunnel excavation (터널의 굴착을 위한 수직사면의 안정대책 방안 수립 및 시행)

  • Park, Chal-Sook;Kim, Jun-Yong;Kwan, Han;Kim, Min-Jo;Choi, Yu-Kyung
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.992-1006
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    • 2008
  • The tunnel type spillways is under construction to increasing water reservoir capacity in Dae-am dam. Cutting-slope adjacent to outlet of spillways had been originally designed to be 63 degrees and about 65m in height. Examination is carried out in preceding construction that it is caused to some problems possibility which of machine for slope cutting couldn't approach to the site, blasting for cutting slope might have negative influence on highway and roads nearby, and fine view along the Tae-hwa river would be eliminated. In order to establish stability of tunnel and more friendly natural environment that we are carry out detailed geological surface survey and analysis of slope stability. So, we are design and construct for tunnel excavation with possible method that it is keep up natural slope. The result of survey and analysis that natural slope was divided 3 zone(A, B, C zone). In A and B zone, in first removed floating rock, high tensile tension net is install that it prevent of release and falling of rock, in order to security during under working. In addition to, pre-stressed rock anchor is install purpose of security during tunnel excavation because of fault zone near vertical developed above excavation level. Zone C is relatively good condition of ground, design is only carry out random rock bolt. All zone are designed and constructed drainage hole for groundwater and surface water is easily drain. Desinged slpoe is harmony with near natural environment. Successfully, construction is completed.

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