• Title/Summary/Keyword: Segment lining

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Durability Comparison of Precast Segment Lining and Cast-in-place Concrete Lining (프리캐스트 세그먼트 라이닝과 현장 타설 콘크리트 라이닝의 내구성 비교)

  • Gyuphil Lee
    • Journal of the Korean GEO-environmental Society
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    • v.24 no.12
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    • pp.13-18
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    • 2023
  • Cast-in-place concrete lining is commonly used in tunnel lining, but cast-in-place concrete lining has problems with construction and quality control. Precast segment lining is being used to solve these problems. In general, precast segment lining is known to have improved durability and easy maintenance such as rehabilitation of structures. This study compared the durability of 22 tunnel linings constructed with precast segments or cast-in-place reinforced concrete.

Basic Study for Evaluation on Application of Energy Lining Segment (Energy Lining Segment 적용성 평가를 위한 기초연구)

  • Han, Sang-Hyun;Park, Sisam
    • Journal of the Korean Geosynthetics Society
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    • v.12 no.4
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    • pp.143-147
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    • 2013
  • Geothermal energy is easy to take advantage of renewable energy stored in the earth and the heat exchanger can be collected through a heat exchange piping system. In this study, have been developed a heat exchange pipe loop system which it could be installed in tunnel segmental linings to collect geothermal energy around the tunnel. The heat exchange pipe loop system incorporated in the tunnel segments circulate fluid to transport with heat from the surrounding ground and the heat can be used for heating and cooling of nearby structures or districts. The segmental lining incorporating heat exchange pipe loop system are called as ELS (Energy Lining Segment). There are a number of examples incorporating a heat exchange pipe loop system in a tunnel lining in Europe. In this study, a field case using Energy Lining Segment in Germany and applications in urban area are thoroughly examined. In addition, a CFD (Computational Fluid Dynamics) analysis was carried out to investigate heat flow in Energy Lining Segment.

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.

State of the Art of Segment Lining in Shield Tunnel and Statistical Analysis of Its Key Design Parameters (쉴드터널 세그먼트 라이닝의 최신 기술동향과 핵심 설계항목의 통계 분석)

  • Chang, Soo-Ho;Lee, Gyu-Phil;Choi, Soon-Wook;Bae, Gyu-Jin
    • Tunnel and Underground Space
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    • v.21 no.6
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    • pp.427-438
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    • 2011
  • Segment lining is a key permanent lining structure to maintain the shield tunnel stability in shield tunnel operation. Moreover, segment lining generally accounts for the largest proportion in the shield tunnel construction costs. As a result, technical improvements to increase its economic feasibility have been actively carried out. This study aims to propose the development directions of high-performance segments from their recent cutting technologies. In addition, based on over 2,100 world-widely collected segment design data, a series of statistical analyses of segment key design parameters such as thickness, width and the number of divisions as well as segment materials were carried out to approximately estimate them in a design stage.

Analysis and Structural Behavior of Shield Tunnel Lining Segment (쉴드터널 라이닝 세그멘트의 해석과 거동 특성)

  • Lee, Hwan-Woo;Kim, Gwan-Soo;Kim, Gwang-Yang;Kang, Dae-Hui
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2007.04a
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    • pp.757-762
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    • 2007
  • The lining segment which is the main structure of the shield tunnel consists of joints, not continua. Past international and domestic design data have been commonly used for design practices without specific verification about the structural analysis model, design load, and affection of the soil constant of the lining segment. In this study, the propriety is estimated through the comparison between analytical solution and numerical solution for segment analysis and design models of the shield tunnel which is being used internationally and domestically. As a result, the full. circumferential beam jointed spring model (1R-S0) is suggested by considering aspects of convenient use, application to field condition, and accuracy of analysis result. With suggested model, the parameter analysis was conducted for joint stiffness, ground rigidity, joint distribution, and joint number.

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Influence of the joint stiffness on the segment design (이음부 강성계수가 세그먼트 설계에 미치는 영향)

  • Choi, Woo-Yong;Park, Jong-Deok;Lee, Seok-Won
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.16 no.1
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    • pp.63-74
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    • 2014
  • The lining of shield TBM tunnel is composed of segments, therefore segment joints are induced by connecting each segment. Segment joint is considered as joint stiffness in the design of TBM tunnel. Depending on the choice among the different stiffness equations, the joint stiffness values determined can be varied largely. Therefore, the influence of joint stiffness value on the design of segment lining should be verified. In this study, the joint stiffness values were determined firstly by using various equations and total change boundary was justified. Within the change boundary determined, the member forces were calculated by changing the joint stiffness through the numerical analysis and consequently the stability of segment lining was investigated by applying nominal strength. The results showed that the segment joint stiffness did not affect the design of segment lining largely.

Evaluation of shield TBM segment acting load through monitoring data back analysis (계측 데이터 역해석을 통한 쉴드 TBM 터널 세그먼트의 작용하중 평가)

  • Lee, Gyu-Phil;Chang, Soo-Ho;Bae, Gyu-Jin;Choi, Soon-Wook;Ahn, Chang-Yoon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.19 no.6
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    • pp.905-913
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    • 2017
  • To design segment lining, loads such as self weight, vertical load, horizontal load, ground reaction, water pressure, backfill grouting pressure et al. have to be considered. Earth pressure and water pressure are the major factor to design segment lining such as concrete strength, segment thickness and amount of rebar et al. To analysis earth pressure and water pressure acting on segment lining, filed monitoring and back analysis are performed in this study.

An approach for moment-rotation relationship and bearing strength of segment lining's joint (세그먼트 라이닝 이음부의 모멘트-회전 관계와 지압강도 계산)

  • Lee, Young Joon;Chung, Jee Seung
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.23 no.2
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    • pp.93-106
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    • 2021
  • In general, segment lining tunnel refers to a tunnel formed by connecting precast concrete segments as a ring and connecting such rings to each other in the longitudinal direction of the tunnel. As the structural properties of the segment lining is highly dependent on the behavior of the segment joints, thus correct modelling of joint behavior is crucial to understand and design the segment tunnel lining. When the tunnel is subjected to ground loads, the segment joint behaves like a hinge that resists rotation, and when the induced moment exceeds a certain limit of the rotation then it may enter into non-linear field. In understanding the effect of the segment joint on the lining behavior, a moment-rotation relationship of the segment joint was explored based on the Japanese practice and Janssen's approach commonly used in the actual design. This study also presents a method to determine the rotational stiffness of joint refer to the bearing strength. The rotation of the segment joint was estimated in virtual design conditions based on the existing models and the proposed method. And the sectional force of the segment lining and joint were calculated along with the estimated rotation. As the rotation at the segment joint increases, the joint contact area decreases, so the designer have to verify the segment joint for bearing strength as well. This paper suggests a consistent method to determine the rotational stiffness and bearing strength of joints.

Analysis and structural behavior of shield tunnel lining segment (쉴드터널 라이닝 세그멘트의 해석과 거동 특성)

  • Jung, Du-Hwoe;Lee, Hwan-Woo;Kim, Gwan-Soo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.9 no.1
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    • pp.37-47
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    • 2007
  • The shield tunneling method has been increasingly employed to minimize environmental damages and civil complaints in the populated and developed area. A lining segment, which is a main structure of the shield tunnel, consists of joints. Conventional foreign and domestic design data have been commonly used for design practices without a specific verification of structural analysis models, design load, and the effect of soil characteristics on the performance of lining segment. In this study, the suitability of existing analytic models used for the design of shield tunnel lining segment has been evaluated through a comparison between analytical and numerical solutions. Based on the evaluation of their suitability performed in the study, a full-circumferential beam jointed spring model (1R-S0) is proposed for design practices by considering user's convenience, the applicability of field conditions and the accuracy of analysis result. By using the proposed model, the parameter analysis was performed to investigate the effects of joint stiffness, ground rigidity, joint distribution and the number of joints on the behavior of lining segment. Parameters considered in the investigation have been appeared to affect the behavior of lining segment. Among those parameters, joint stiffness has been appeared to have the most significant effect on the bending moment and displacement of lining segment.

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A study on the factors influencing the segment lining design solved by beam-spring model in the shield tunnel (쉴드 터널 세그먼트 라이닝 설계에서 빔-스프링 구조 모델이 단면력에 미치는 영향)

  • Kim, Hong-moon;Kim, Hyun-su;Shim, Kyung-mi;Ahn, Sung-youll
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.19 no.2
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    • pp.179-194
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    • 2017
  • The segment lining design for shield tunnel is generally carried out by using the beam-spring model and the induced member forces from the model are strongly influenced by the components of the model such as imposed load, coefficient of subgrade reaction, location of segment joint and its stiffness. The structural models and stiffness of its connection part found used in abroad design cases is usually obtained as it is for the domestic design of segment of shield tunnel. Those models and stiffness in existing design cases are conventionally applied to a new tunnel design without any suitability review for the project. In this study, the application method of base components of the model such as the coefficient of subgrade reaction and modelling method to the segment lining design was suggested by carrying out the comparative study of the base elements for the member forces estimation of segment lining of shield tunnel.