• Title/Summary/Keyword: 도심지 지반

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Reliability Estimation of Site Investigation by Geotechnical Risk Analysis in Subway Tunnel (지하철 터널에서의 위험도 분석을 통한 지반조사 신뢰성 평가)

  • 김환준;김우성;김영근;이두화;박진우;김갑부
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • 2004.10a
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    • pp.13-22
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    • 2004

  • 본 연구에서는 도심지 지하철 터널을 대상으로 지반공학적 위험요소가 공사비 및 공기에 미치는 영향을 정량적으로 평가하기 위하여 잔여 리스크 개념을 이용하여 조사개소의 증가에 따른 공사비 및 공기의 신뢰도를 분석하였다. 신뢰도 분석결과, 지반조사 개소가 증가함에 따라 공사비 및 공기에 대한 위험도가 축소됨을 확인하였으며, 이러한 결과를 통하여 도심지 지하철 터널에서의 지반공학적 위험도 분석의 유용성을 확인하였다.

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Applicability Study on Deep Mixing for Urban Construction (심층혼합처리 공법의 도심지 공사 적용성 연구)

  • Kim, Young-Seok;Choo, Jin-Hyun;Cho, Yong-Sang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.1
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    • pp.500-506
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    • 2011

  • The deep mixing method, which is generally considered as a method for improving soft ground, is assessed in terms of its applicability for urban construction. Using small equipment tailored to perform deep mixing in congested urban areas, deep mixing was performed to reinforce the foundation ground of a retaining wall in a redevelopment site in Seoul. Strengths characteristics, construction vibrations and displacements induced to an adjacent old masonry wall were evaluated by laboratory tests and field monitoring. The results indicate that the strength of ground was improved appropriately whilst the vibrations and displacements induced by deep mixing were slight enough to satisfy the general requirements for construction works in urban environments. Therefore, it is concluded that deep mixing method can be a practical option for foundation methods in urban construction works where minimizing noise and vibrations is an important concern.

  • https://doi.org/10.5762/KAIS.2011.12.1.500 인용 PDF KSCI

Pseudo-DC Resistivity Survey for Site Investigation at Urban Areas with Ambient Electrical Noises (전기잡음 간섭이 있는 도심지 지역 탐사를 위한 유사직류 전기비저항 기법)

  • Joh, Sung-Ho;Kim, Bong-Chan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.1C
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    • pp.37-44
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    • 2010

  • Recently, urban retrofit and extension, development of new buildings and facilities, and construction of underground structures like subway tunnels in urban areas give rise to significance of site investigation at urban areas. However, ambient electric noises, traffic vibrations, embedded objects work as obstacles to high-quality and accuracy in site investigation at urban areas. In this paper, a new technique called the pseudo-DC resistivity survey (in brief, PDC-R) was proposed to minimize the adverse effect of ambient electrical noises in resistivity survey. PDC-R technique utilizes an AC current with frequency range of 0.1 to 1.0 Hz rather than DC current, which is used for conventional resistivity survey. The motivation of using low-frequency AC current is to avoid 60-Hz components or its multiples in the resistivity survey which ambient noises are mostly composed of. The implementation of PDC-R technique also included the parametric study on skin effect, frequency effect and current-level effect, which led to the determination of optimal values of frequency and current level for PDC-R survey. The reliability and feasibility of PDC-R technique was verified through field tests, accompanied by the comparison with DC resistivity survey and CapSASW tests.

  • https://doi.org/10.12652/Ksce.2010.30.1C.037 인용 PDF KSCI