• Title/Summary/Keyword: urban tunnelling

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Application of risk evaluation and safety management system in urban deep tunnelling (도심지 대심도 터널에서의 리스크 평가 및 안전관리시스템 적용)

  • Moon, Joon-Shik;Jeon, Kichan;Kim, Younggeun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.24 no.6
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    • pp.725-744
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    • 2022
  • As the construction of infrastructure using the underground tunnel in urban area have been rapidly increased, various accidents and collapses of tunnel including structure have been occurred in deep urban tunnelling. The concern and worry relating to the risk and safety of the tunnel during excavation is becoming the key issues in deep urban tunnelling. In this study, it was conducted for deep urban tunnel at GTX (Great Train Express) line which was located in Seoul metropolitan area to determine the risk characteristics for tunnel according to urban tunnelling. Also, it was reviewed the risk analysis and evaluation of the tunnel, shaft and station. And after a review of risk analysis and evaluation for risk register and hazard identification by using a risk matrix method, safety management of the tunnel according to excavation was evaluated to be secured. This study is expected to be applied as useful approach in deep urban tunnelling if you need to review the risk and safety management system of tunnel according to mitigation measures in complex urban tunnelling.

Development of GIS Based Risk Assessment System for Adjacent Structures Due to Tunnelling-Induced Ground Movements in Urban (GIS기반을 이응한 도심지 터널굴착에 따른 인접 구조물 손상평가 시스템 개발)

  • 윤효석;박용원;오영석;김제규
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.03a
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    • pp.493-500
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    • 2001
  • The construction of bored tunnels in soft ground inevitably causes ground movements. In the urban environment these may be of particular significance, because of their influence on buildings, other tunnels and services. The prediction of ground movements and the assessment of the potential effects on the structures is therefore an essential aspect of planning, design and construction of a tunnelling project in the urban environment. In this study, to minimize the effect of tunnelling-Induced ground movements on the adjacent structures, a system for tile settlement risk management was developed. The GIS based risk assessment system for adjacent structures developed in this study consists of several modules such as building information module, settlement evaluation module, potential risk assessment module for adjacent structures, and analysis module for monitoring data. This system focuses on controlling and managing construction processes that may lead to settlement In the surrounding buildings and can contribute to producing the optimum technical and economic design.

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Identification and importance analysis of hazards affecting the stability of TBM tunnelling works (TBM 터널 굴착 안정성에 영향을 미치는 위험요소 도출 및 중요도 결정)

  • Seong, Joo-Hyun;Youn, Jun-Ung
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.19 no.6
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    • pp.973-984
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    • 2017
  • There is a growing need to apply TBM tunnelling method for the construction of underground facilities such as subways and utility tunnels in urban areas. Due to the variability and uncertainty of the ground, tunnelling in urban areas has various safety hazards which could cause damage to people and properties and it is very costly to recover from accidents. Therefore, it is very important to identify hazards from the planning and design phase and to establish risk mitigation measures. In this study, a total of 31 hazards affecting the stability of TBM tunnelling works in urban areas were listed from both the technical literature and correspondence with experts in tunnelling area. The importance and priorities of the hazards were analyzed by conducting Delphi technique, which is a decision-making method by consensus among experts. Finally, 12 hazards that satisfy the content validity criteria were settled and could be used as major control factors for accident prevention during TBM tunnelling works.

TUNNELLING IN SOFT GROUND IN URBAN AREAS

  • Fujita, Keiichi
    • Proceedings of the Korean Geotechical Society Conference
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    • 1990.10a
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    • pp.9-24
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    • 1990
  • Most tunnels in soft soils in urban areas are constructed by shield tunnelling method for environmental reasons. Ground surface settlements are caused by shield tunnelling so that auxiliary measures are often required. Simple methods to predict ground surface settlement are given. The use of the slurry or the earth pressure balance shield machine and the application of new methods of grouting with computer aided operation control systems decreases the ground surface settlement to 3 mm. The construction cost of tunnels is almost identical whichever type of shield machine is employed according to a statistical investigation.

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Strength Characteristics of Soil-Cement Constructed in Seoul Urban Area (서울 도심지 내 지반에 시공한 소일-시멘트의 강도 특성)

  • Choo, Jin-Hyun;Kim, Young-Seok;Kim, Hak-Seung;Cho, Yong-Sang
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.03a
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    • pp.1206-1211
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    • 2010
  • Soil-cement, a hardened mixture of Portland cement, soil, and water that contain sufficient durability, has been widely utilised in Seoul urban construction sites to retain lateral earth pressures or reinforce grounds. However, little information has been reported about the strength characteristics of soil-cement constructed in Seoul urban area. In this study, we performed a number of unconfined test to the soil-cements mixed from soils sampled in 3 sites in Seoul urban area. Results indicate that unconfined strengths and optimum cement amounts of soil-cements are highly dependent on the proportion of coarse-grain particles of mixed soils. Furthermore, changes of unconfined strengths with curing time are diverse with respect to mixing conditions.

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