• Title/Summary/Keyword: 라이닝

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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 analytical solution for soil-lining interaction in a deep and circular tunnel (원형터널에서 지반-라이닝 상호작용에 대한 수학적 해석해에 관한 연구)

  • Lee, Seong-Won;Jeong, Jea-Hyeung;Kim, Chang-Yong;Bae, Gyu-Jin;Lee, Joo-Gong;Park, Kyung-Ho
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.11 no.4
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    • pp.427-435
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    • 2009
  • This study deals with the analytical solution for soil-lining interaction in a deep and circular tunnel. Simple closed-form analytical solutions for thrust and moment in the circular tunnel lining due to static and seismic loadings are developed by considering the relations between displacement and interaction forces at the soil-lining interface. The interaction effect at the soil-lining interface is considered with new ratios (the normal and shear stiffness ratios). The effects of the ratios on the normalized thrust and the normalized moment are investigated.

A study on hydraulic behaviour and leakage control of segment linings using the numerical method (수치해석을 이용한 세그먼트라이닝의 수리거동과 누수제어 연구)

  • Shin, Jong-Ho;Shin, Yong-Suk;Pam, Dong-In;Chae, Sung-Elm;Choi, Kyu-Hoon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.11 no.2
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    • pp.131-140
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    • 2009
  • It has been repeatedly reported that a drainage system of a drained tunnel is deteriorated. And consequently the water pressure on the lining increases with time. However, little research on the watertight tunnel was found in the literatures. According to field measurements, leakage of the undrained tunnel has increased with time, which is completely opposite to the behavior of the drained tunnel. It is evident that the hydraulic deterioration of the tunnel lining changes the water pressure on the lining and the amount of leakage, thus the design coneept in terms of groundwater is not maintained tightly throughout the life time of the tunnel. The Segment lining is generally constructed as watertight. However, it is frequently reported that the leakage in the segment tunnel increases with time. It is also reported that the leakage is generally concentrated at the joints of the segments. In this study structural and hydraulic interaetion of the segment lining due to the hydraulic deterioration of the segments and the joints is investigated using the numerical modeling method. An electric utility tunnel below groundwater table is considered for the analyses. The effects of hydraulic deterioration of the segment lining are identified in terms of ground loading, water pressure and lining behavior. A remedial grouting measure for leakage is also numerically simulated, and its appropriateness is evaluated.

A Study on Field Change Case of Tunnel Concrete Lining Designs Using GLI(Ground Lining Interaction) Model (GLI(Ground-Lining Interaction)모델을 이용한 터널 콘크리트라이닝의 현장 설계변경 사례에 대한 연구)

  • Chang, Seok-Bue;Lee, Soo-Yul;Suh, Young-Ho;Yun, Ki-Hang;Park, Yeon-Jun;Kim, Su-Man
    • Tunnel and Underground Space
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    • v.20 no.1
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    • pp.58-64
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    • 2010
  • GLI model was verified to consider the interaction between a ground and a tunnel lining and to rationally reduce the ground load acting on the secondary lining(concrete lining) of a tunnel. In this study, the economy and the construction condition of tunnel concrete linings designed by a conventional frame model at Lot O of OO line were highly enhanced through a field design change using GLI model. For a few safe considerations, not only about 50% saving of reinforcing steel could reduce the material cost but also the wide space between bars could make it easy to pour concrete mix without voids. There was large saving effect of reinforcing steel for poor ground conditions because Terzaghi's load used in the conventional frame model produces too much high loads for those conditions.

Dynamic Behaviors of a Corrugated Steel Tunnel Lining System due to Wind Loads by Passing Vehicles according to the Boundary Conditions (구조물 경계조건에 따른 파형강판 터널라이닝의 풍하중에 대한 동적 거동분석)

  • Mha, Ho-Seong;Cho, Kwang-Il;Yoo, Sung-Heum
    • Journal of Korean Society of Steel Construction
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    • v.24 no.1
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    • pp.47-58
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    • 2012
  • Dynamic behaviors of a corrugated steel plate tunnel lining system are examined under wind loads due to passing vehicles. Applied wind loads are simulated by applying the time functions as a vehicle moves through the tunnel. Wind loads are described by the pressure and suction as a vehicle arrives and leaves target positions in the tunnel. The tunnel lining is modeled using the simplified shell elements that retain the characteristics of the corrugated shapes. The displacements of the tunnel lining are evaluated under various conditions regarding wind velocity and the passing vehicles. The responses are found to increase as the vehicle velocity and wind velocity increase. A maximum displacement of 25mm occurs when two vehicles are crossing at the speed of 120km/h. A row of vehicles running consecutively minimally affects the dynamic responses with less than 2.5% of the dynamic responses enlarged and attributed to one running vehicle. It should be noted that the dynamic responses of the tunnel lining should be considered when there is no shotcrete applied.

A Back Analysis Study for the Assessment of Tunnel Lining Safety Using Numerical Analysis Model (수치해석 기법을 이용한 터널 라이닝 안전성 평가에 관한 역해석 연구)

  • 박치현;김창용;이희근
    • Tunnel and Underground Space
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    • v.9 no.4
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    • pp.296-305
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    • 1999
  • In ordinary back analysis it if hardly possible to obtain the mechanical properties of tunnel lining by using commonly measured displacements of tunnel lining, because only a few displacements could be measured at the site. Therefore, it is necessary to develop a new method which can evaluate the state of stresses of tunnel by using measured data. In this study, in order to assess tunnel lining stability by estimating its stresses with a few measured displacements, a formulation of back analysis method was proposed. The accuracy of results were investigated through the parametric study for several types of measurement model of two dimensional elastic lining. This new back analysis method to assess tunnel lining stresses and strains with a few numbers of measured displacements showed high accuracy and good applicability when compared to the results of numerical experiments by FEM. The method has been tested on subway tunnel and its applicability has been confirmed by comparing field and analytical data. It is verified that the stress on the tunnel lining can be obtained by only more than 3 point of input displacements without any condition of external loads.

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Dynamic Behaviors of the Curved Steel Tunnel Lining due to Wind Loads by Passing Vehicles (통과차량으로 인한 풍하중에 대한 곡선 강재 터널라이닝의 동적 거동 분석)

  • Mha, Ho-Seong;Cho, Kwang-Il;Park, Inn-Joon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.14 no.4
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    • pp.309-320
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    • 2012
  • Dynamic behaviors of the tunnel linings of curved tunnels with various curvatures are investigated to examine the effect of wind loads due to passing vehicles. In the case without backfill, the responses of the tunnel lining should be considered to examine the clearance of the lining. A steel tunnel lining is selected to see the influence of the wind load upon the tunnel lining more clearly. The wind pressure upon the lining is simplified into the pressure and suction while the vehicle passing the loading positions. As the radius of curvature decreases, the response decreases, showing that the strength against the deformation is found to increase since the asymmetry of the deformation shape is reduced. It is found that the responses increase as the passing vehicle speed increases.

A study on the estimation of the optimal number of monitoring points in single-track tunnel lining with the inverse analysis program (역해석 프로그램에 의한 단선터널 라이닝의 최적 계측 측점수 산정 연구)

  • Woo, Jong-Tae
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.16 no.1
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    • pp.1-11
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    • 2014
  • In order to determine the optimal number of monitoring points in single-track tunnel lining, this thesis compares and evaluates the results of two cases: when the tunnel lining is modeled into a simple beam form and then is applied to 1) the tunnel lining inverse analysis program, and to 2) the commercially-used program. The displacement and stress of specific tunnel lining cross-sections are determined by entering the load conditions into the commercially-used program for tunnel interpretations. In doing so, two cases were assumed: where a symmetrically-distributed load was acting upon the tunnel lining of a single-track tunnel and where an asymmetrically-distributed load was in action. By comparing the computed displacement with the stress and displacement determined by entering side numbers 3, 5, and 7 into the tunnel lining inverse analysis program, the optimal number of monitoring points is determined. From the results of the research, it can be inferred that the number of monitoring points needs to be at least 5 points, considering the efficiency of monitoring in practice and the loss-and-damage rate of tunnel monitoring.

Analysis of the Structural Behaviours of Aluminum Tunnel Lining in Joomunjin Standard Soil by Centrifugal Model Tests (원심모형실험을 이용한 주문진 표준사 지반내 알루미늄 모형 터널 복공의 역학적 거동에 관한 연구)

  • 김택곤;김영근;박중배;이희근
    • Tunnel and Underground Space
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    • v.9 no.2
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    • pp.114-130
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    • 1999
  • It is very important to study on the structural behaviors of structurally damaged tunnel linings. A series of centrifuge model tests were performed in order to investigate different behaviors of tunnel linings. A 1/100-scaled aluminum horseshoe tunnel linings with a radius 5 cm, height 8 cm were buried in a depth with dry Joomunjin standard sand, the relative density of which was 86%. Such sectional forces as bending moments and thrusts along the tunnel circumference were measured by twelve strain gages. Earth pressures in soil mass and on the outside of lining model were estimated by pressure transducers, ground surface settlements at a center and edges by using LVDTs.

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A Study on Crack Control of Tunnel Lining Concrete with Large Section (대단면 터널 라이닝 콘크리트의 균열저감 연구)

  • Kim, Wan-Young
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.509-512
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    • 2008
  • The lining concrete of water tunnel is a much capability to occur crack due to drying shrinkage and vibrator compaction etc. Because of crack of concrete induce structural problem and decrease durability of concrete, it is need to reduce crack of concrete. In this an Analytical study to analyze the effect of curing of concrete and compaction on the lining concrete. As the results, it was found that control of construction condition into curing of concrete and compaction improve on construction efficiency of the lining concrete.

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