• Title, Summary, Keyword: Transversal Tunnel Section

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The development of a back analysis program for subsea tunnel stability under operation: transversal tunnel section (운영 중 해저 터널의 안정성 평가를 위한 역해석 프로그램 개발: 횡단방향)

  • An, Joon-Sang;Kim, Byung-Chan;Lee, Sang-Hyun;Song, Ki-Il
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.19 no.2
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    • pp.195-212
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    • 2017
  • When back analysis is used for the assessment of an operating subsea tunnel safety in various measurement information such as stress, water pressure and tunnel lining and ground stiffness degradation, the reliable results within tolerable error rate can be obtained. By utilizing a commercial geotechnical analysis program FLAC3D, back analysis can be performed with a DEA which has already been successfully validated in previous studies. However, relative more time-consumption is the drawback of this approach. For this reason, this study introduced beam-spring model-based on FEM solver which uses less analysis time relatively. Beam-spring program capable of structural analysis of a circular tunnel section was developed by using Python language and combined with the built-DEA. From the measurement datum, expected to estimate the stability of an operation tunnel close to real-time.

Three Dimensional Characteristics of the Airflow in Unidirectional Vehicle Tunnels

  • Kim, Sang-Hyun;Kim, Doo-Young;Choi, Pan-Gyu;Lee, Chang-Woo
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • pp.287-300
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    • 2008
  • Airflow distributions along tunnel and over the cross section are critical in selecting installation location of the velocity monitor to obtain the representative data for ventilation as well as fire safety systems. This paper aims at performing CFD and on-site studies to analyze the longitudinal and cross-sectional distributions of the air velocity in tunnels employing longitudinal and semi-transversal ventilation systems. This study can ultimately contribute to selecting the monitor type as well as the optimal installation locations in vehicle tunnel.

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Development of beam-spring model to analyse the stability of double-deck tunnel (복층터널 안정성 분석을 위한 빔-스프링 모델 개발)

  • Lee, Sang-Hyun;An, Joon-Sang;Kang, Kyung-Nam;Kim, Byung-Chan;Song, Ki-Il
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.19 no.2
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    • pp.301-317
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    • 2017
  • In this study, as an initial study for development of stability analysis program of a double-deck tunnel during life cycle, a structural analysis solver based beam-spring model for the double-deck tunnel is constructed. Effect of parameters(slab supporting type, depth of the tunnel and ground elastic modulus) is analyzed with the beam-spring model. The model is also compared and verified by commercial structural analysis program. It is considered that the slab supporting type affects the integrated behavior with segment lining and influence of intermediate slab on the stability of the tunnel decreases as the tunnel depth increases. The relationship between the ground elastic modulus and the effect of the intermediate slab on the segment lining needs further investigation.