• Title/Summary/Keyword: 빌딩 굴착면

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Design of Building Excavation Plane in Innovative Prestressed Scaffolding(IPS) System (혁신적 프리스트레스트 가시설 구조시스템(IPS)을 적용한 굴착면의 해석 및 설계)

  • Kim, Sung-Bo;Han, Man-Yop;Kim, Moon-Young;Jung, Kyoung-Hwan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.1A
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    • pp.163-171
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    • 2006
  • The behaviors and design procedures of building excavation plane in innovative prestressed support (IPS) system are presented in this paper. Determination procedure for initial pretension in IPS wale subjected to design earth pressure is derived. The computer analysis model under uniform and non-uniform earth pressure is constructed using beam element for the IPS wale, tension-only element for cable, and compression-only element for soil. Axial forces and bending moments of IPS wale under initial pretension and design earth pressure are calculated. The combined stresses due to these axial force and bending moment are calculated and safety condition of building excavation plane is investigated.

Risk Of Buildings Damage Due To Subsidence During Tunnelling Under The Buildings In Sand-Gravel Layer (빌딩하부 모래자갈층에서 터널시공 중 발생한 지표침하에 의한 빌딩의 손상)

  • Kim, Cheehwan
    • Tunnel and Underground Space
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    • v.25 no.4
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    • pp.383-396
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    • 2015
  • It is analyzed the risk of building damage due to ground surface subsidence occurred during constructing a tunnel below buildings in sand-gravel layer. The overburden and the thickness of sand-gravel layer is about 20m and the width and the height of the tunnel are 12m and 8.6m, respectively. The tunnel is pre-reinforced by umbrella method with three rows of long steel pipes and grouting. Surface subsidence is measured at 36 points surrounding buildings and measured data are used to calculate optimized three dimensional subsidence surface. Depending on the building location, deflection ratio and horizontal strain are calculated to evaluate the risk of building damage. No damage occurs at the buildings because of both the small deflection ratios involved 1~4mm subsidence and compressive horizontal strains.