• Title/Summary/Keyword: 인접굴착

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Evaluation of Track irregularity due to Adjacent Excavation Work on Serviced Urban Transit (도시철도 인접굴착공사에 따른 운행선 궤도의 궤도틀림 분석)

  • Choi, Jung-Youl;Lee, Ho-hyun;Kang, You-Song;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.2
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    • pp.481-487
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    • 2020
  • In this study, finite element analysis was performed to evaluate the track irregularity of the existing track system on urban transit according to the large-scale excavation work that is constructed adjacent to the serviced line. Based on the numerical analysis, the effect of track irregularity generated during the step-by-step construction process was analytically derived, and the stability in terms of track deformation was evaluated through comparison with related standards. As the results, in the case of track irregularity items evaluated based on the relative displacement difference at a certain distance, such as alignment and vertical irregularity, it occurred most clearly at the location where deformation of the existing structure begins, such as the end point of adjacent excavation work. On the other hand, the overall vertical and horizontal displacement of the track was the largest deformation at the center of the construction section. The vulnerable position of the deformed side of the existing structure due to adjacent excavation is analytically proven that the both of the end point section and the center of the construction can be a vulnerable position in terms of track irregularity.

Evaluation of Track Irregularity Effect due to Adjacent Excavation on Serviced Railway Line (철도시설물 인접굴착공사에 따른 운행선 궤도의 궤도틀림 영향 평가)

  • Choi, Jung-Youl;Park, Dong-Ryong;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.4
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    • pp.401-406
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    • 2019
  • The three-dimensional precision numerical analysis was performed using the finite element model applied with the railway track model consisting of rails, sleepers, and track elastic springs(ballast, rail pad). As a result of analyzing the track deformation level of the existing tracks due to the excavation work adjacent to the railway facilities, it was found that the track irregularity evaluation criteria (allowed values) of both conventional and high-speed railways lines were satisfied. Based on the numerical analysis using the track model, it was analyzed that the results of the prediction of the track irregularity due to the excavation work and the level of the track deformation occurring at the actual site could be approximated as closely as possible.

A Study on the Behaviour of Existing Subway Tunnel due to Demolition of Old Buildings and Construction of New Buildings (기존 건물 철거 및 신축 공사에 따른 지하철터널 거동특성 연구)

  • Chung, Jeeseung;Lee, Kyuyoung;Kim, Yongsoo;Lee, Sungil
    • Journal of the Korean GEO-environmental Society
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    • v.15 no.10
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    • pp.23-28
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    • 2014
  • Recent increasing of redevelopment project causes construction of new buildings after demolition of old buildings. However, the researches have been largely confirmed to analysis of behaviour characteristics of existing subway tunnel due to adjacent excavation which constructing new building so far. Accordingly, The ${\bigcirc}{\bigcirc}$ Building which will be built after demolishing existing parking lot is selected as a subject of study. And the purpose of this study is to analyze the effects on existing subway tunnel due to loading and unloading caused by demolition of upper buildings. The numerical analysis was performed by using the MIDAS/GTS program. Two cases for the numerical analysis were analyzed. The one is considering demolition of old buildings and the other is not considering it. This study is to analyze the effect on existing subway tunnel caused by demolition of upper building by analyzing numerical analysis results for tunnel displacement and lining stress. It was analyzed that the effects of considering the demolition of old buildings are larger than those of no considering it.

Parameter Study of Track Deformation Analysis by Adjacent Excavation Work on Urban Transit (인접굴착공사에 따른 지하철 궤도 변형 해석을 위한 매개변수 연구)

  • Choi, Jung-Youl;Cho, Soo-Il;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.4
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    • pp.669-675
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    • 2020
  • In this study, 3D analysis was compared in evaluating the track deformation of subway structures during adjacent excavation. For the 3D analysis model, the boundary conditions of the tunnel model and the application level of the ground water were analyzed as variables. As the result of the effects of track irregularity using the 3D model, the analysis model considering the site ground water level instead of the design values and changing the constraint of the boundary condition is more reasonable. In addition, the influence of track irregularity due to the boundary condition and load condition of the analytical model is more obvious in the factors directly affected by the longitudinal relative displacement of the rail, such as alignment, cross level and gauge irregularity. Therefore, the evaluation on track stability according to adjacent excavation work was appropriate to analysed the longitudinal deformation of the track by using 3D model that could be investigate the deformation of rail. In addition, the boundary condition and load condition(ground water level) of the numerical model was important for accurate analysis results.

A Case Study on Reinforcement Method by Excavation Adjacent to the Subway Tunnel using Numerical Analysis (수치해석을 통한 지하철 구조물 인접 굴착에 따른 보강공법 적용사례연구)

  • Byun, Yo-Seph;Jung, Kyoung-Sik;Chun, Byung-Sik
    • Journal of the Korean GEO-environmental Society
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    • v.12 no.9
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    • pp.5-11
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    • 2011
  • Recently, large and deep excavations are increasing. The damage of adjacent structures due to excavation has steadily increased with increasing construction demand. Especially in urban development and poor conditions, the excavation adjacent to the subway structures has caused a lot of problems. This paper was reviewed that the underground excavation and reinforcement of the status process through a case study on the field. And stability analysis through the case study evaluates applicability for reasonable reinforcement method by numerical analysis. As a result, the strata distribution condition of all 16 sites consisted of landfill from the top and distributed in the order of deposits, weathered soils, weak rock from the bottom. Also, when proceeding the excavation adjacent to structures, the location of site and layer conditions have highly effect on the results of the construction. Therefore, this study was applied reinforcement method to protect damage by excavation. Displacement and settlement were within allowable criterion and hence, stability of structure was analyzed as safe.

Evaluation of Structural Stability of Tunnel due to Adjacent Excavation on Urban Transit (도시철도 인접굴착공사에 따른 터널구조물의 구조 안정성 평가)

  • Choi, Jung-Youl;Lee, Ho-hyun;Kang, You-Song;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.2
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    • pp.503-508
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    • 2020
  • The three-dimensional precision numerical analysis was performed using the finite element model applied with the railway track model consisting of rails, As a result of analyzing the track deformation level of the existing tunnel due to the excavation work adjacent to the urban transit, it was found that the evaluation criteria (allowed values) of conventional railways lines were satisfied. Based on the numerical analysis, it was analyzed that the results of the prediction of the tunnel structural stability of due to the excavation work and the level of the tunnel deformation occurring at the actual site could be approximated as closely as possible.

Active Earth Pressure Acting on Excavation Wall Located Near Existing Wall Face (도심지 인접 굴착 시 굴착벽에 작용하는 횡방향 토압에 대한 연구)

  • Lee, Jin-Sun
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.12
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    • pp.67-74
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    • 2012
  • The arching effect of the active earth pressure acting on an excavation wall subjected to close excavation reduces lateral earth pressure acting on excavation wall. In this paper, the arching effect was estimated for varying width to excavation depth ratio and wall friction angle by analytical and numerical methods verified with centrifuge test results. The arching effect is significant when the width to excavation depth ratio and wall friction angle is decreased and increased, respectively. The analytical solution derived from the classical arching theory suggested by Handy(1985) shows good agreement with the numerical solution than the other solutions.

건설업규모별 안전관리 활성화 방안

  • 김종욱;고성식
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • pp.467-472
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    • 2002
  • 우리나라의 건설업은 IMF이후 건설공사의 양적 증가, 고층화와 지하공간 활용증대에 따른 굴착심도의 증가, 건설입지의 확장, 도시기반 시설의 고밀도화와 기존 지하매설물과 인접한 굴착작업의 증가 등으로 건설현장 내에서의 사고위험성은 더욱 높아지고 있으며, 이러한 위험요인들은 재해로 이어져 근로자의 인명피해는 물론 기업의 경제적 손실을 초래하여 국가산업발전에 지대한 영향을 미치고 있다.(중략)

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An Analysis iff the Mutural Relation between Sinkhole and 'Permanent under Draingage System' as A Measure of Non Floating (씽크홀(SINKHOLE)과 부력방지 대책인 '영구배수 공법'과의 상관관계)

  • Kwon, Hoi ku
    • Proceedings of the Korean Society of Disaster Information Conference
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    • pp.257-259
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    • 2017
  • 최근에 국내에서 입법된 "지하안전관리에 관한 특별법"의 지하안전영향평가 등에서 지하매설물 및 굴착공사 관리의 중요성을 강조하고 있지만, 아직까지는 지하를 개발함에 있어 지반의 안전과 관련된 사항은 미흡한 실정으로 도심지 지반침하( Sinkhole) 현상이 매년 증가하고 있다. 그리고 지반침하(Sinkhole)는 발생이 될 경우 인명피해는 물론 도로나 주변 건물들에 막대한 피해를 줄 수 있는 소지가 충분한 대상으로 사료됨에도 불구하고 이러한 현상을 건설현장에서 심각하게 받아들이는 분위기는 어느 곳에서도 감지되지 않는다. 다만 정부부처나 공공기관에서 국회차원의 지대한 관심에 부응하여 이에 대해 광범위한 연구와 조사에 막대한 예산을 투입하여 다방면에서 진행되고 있는 것으로 파악되고 있다. 또한 이러한 연구결과의 자료를 근거로 하여 지반침하 사고의 주요 원인을 조사해본 결과 상하수도관 손상과 무리한 인접굴착공사 및 대부분의 대형건축공사 현장에 채택되고 있는 부력방지 대책의 일환인 영구배수공법의 무분별한 적용을 들 수 있었다. 이러한 상황에서 그 중 비용과 난이도를 고려현장에서 용이하게 저감할 수 있는 방법인 영구배수공법을 선정하여 영구배수공법의 이론적 고찰과 공학적 타당성(구조체 부상방지 안전성 검토기준)을 연구하여 무분별한 영구배수공법 적용으로 지반침하(Sinkhole)가 발생하는 것을 막아 인명피해와 도로나 구조물의 안전성을 확보하고 나아가 영구배수공법 적용으로 항구적 발생하는 천문학적인 유지관리비의 절감이 목적이다.

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