Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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A Study on the Ground Movement around Tunnel Reinforced by Umbralla Arch Method

Umbrella Arch 공법에 의한 터널 천단부 보강시 주변 지반의 거동에 관한 연구

  • 배규진 (한국건설기술연구원 지반연구실 실장) ;
  • 김창용 (건설기술연구원 지반연구실 연구원) ;
  • 문홍득 (한국건설기술연구원 지반연구실) ;
  • 훙성완 (한국건설기술연구원 부원장)
  • Published : 1997.12.01
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Abstract

Soil and rock improvement and reinforcement techniques are applied to achieve safe tunnel excavation in difficult geological conditions. The Umbrella Arch Method(UAM), one of the auxiliary techniques, is used to reduce ground permeability and improve stabtility of the tunnel by inserting a series of steel pipes into ground around the crown inclined to the longitudinal axis of the tunnel. Additionally, multi-step grouting is added through the steel pipes. UAM combines the advantages of a modern forepoling system with the grouting injection method. This technique has been applied in subway, road and utility tunneling sites for the last few years in Korea. This paper presents the results of analysis of the case studies on ground movements associated with UAM used in the Seoul Subway line 5 constructon site. Improvement of tunnel stability and decrease of ground settlement expected with pipe insertion are also discussed. Finally, the method to minimize ground settlements caused by NATM tunnelling are suggested.

Keywords

References

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