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Stability analysis of an existing utility tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel

복층터널의 분기터널 굴착에 따른 지하 공동구의 안정성 분석

  • Nam, Kyoung-Min (Department of Civil Engineering, Hanyang University) ;
  • Choi, Min-ki (Department of Civil Engineering, Hanyang University) ;
  • Kim, Jung-Joo (Department of Civil Engineering, Hanyang University) ;
  • Jafri, Turab H. (Department of Civil Engineering, Hanyang University) ;
  • Yoo, Han-Kyu (Department of Civil Engineering, Hanyang University)
  • 남경민 (한양대학교 건설환경공학과) ;
  • 최민기 (한양대학교 건설환경공학과) ;
  • 김정주 (한양대학교 건설환경공학과) ;
  • ;
  • 유한규 (한양대학교 건설환경공학과)
  • Received : 2017.03.10
  • Accepted : 2017.03.23
  • Published : 2017.03.31

Abstract

Government plans to construct a double-deck tunnel under a portion of Gyeongbu Expressway that will solve traffic problems and could also be used as a flood storage facility. Divergence tunnels connect the main tunnel to the urban areas and their construction effects on adjacent structures at shallow depth need to be analyzed. This study primarily includes the numerical analysis of construction effects of divergence tunnels on utility tunnels. The utility tunnel was analyzed for three cases of volume loss applied to the divergence tunnel and two cases of the angle between main tunnel and divergence tunnel ($36^{\circ}$ and $45^{\circ}$). The results show that the more the volume loss was applied and the shorter the distance was between utility tunnel and divergence tunnel, the more the utility tunnel was affected in terms of induced displacements, angular displacement and stability. The worst scenario was found out to be the one where the angle between main tunnel and divergence tunnel was $36^{\circ}$ and the distance between divergence tunnel and utility tunnel was 10 m, resulting in the largest displacement and differential settlement at the bottom of the utility tunnel. A relationship between the angular displacement and the distance to diameter ratio was also established.

Acknowledgement

Grant : 대심도 복층터널 설계 및 시공기술개발

Supported by : 국토교통과학기술진흥원

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