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Study on the Estimation of Safety Zone and the Movement of Ground at the Inter-Crossing Tunnel  

Kim, Woo-Sung (우경KPE)
Yoo, Dong-Uk (우경KPE)
Lee, Sang-Eun (강원대학교 에너지.자원공학과)
Publication Information
Tunnel and Underground Space / v.18, no.6, 2008 , pp. 491-502 More about this Journal
Abstract
A certain range of the original ground around the tunnel should be preserved to ensure structural safety of the tunnel when other structures are made around the tunnel, and thus this range is defined as safety zone of the tunnel. The main points to ensure the stability of an existing tunnel when constructing a new tunnel in an inter-crossing area are distance between two tunnels, size of the new tunnel, excavation method for the new tunnel, ground condition around the tunnel, and lining type of the existing tunnel etc. When the new tunnel is excavated above the existing tunnel, the existing tunnel is likely to suffer deformation at a crown zone, damage of arching effect, and live load of the new tunnel etc. On the other hand, when the new tunnel is excavated below the existing tunnel, the existing tunnel is likely to be damaged due to settlement. This study has been made on the behavior of the existing tunnel by means of model test and numerical analysis when the new tunnel is excavated below the existing tunnel. Safety zone of the tunnel was estimated by the results of strength/stress ratio obtained from numerical analysis, and the movement of ground was estimated by the model test. The results of earth pressure, ground displacements, and convergence of the tunnel obtained from model test were compared with those of numerical analysis, and show a similar trend.
Keywords
Safety zone; Inter-crossing area; Model test; Numerical analysis;
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  • Reference
1 Hoek, E. and E.T. Brown, 1980, Underground Excavation in Rock, Institution of Mining and Metallurgy, pp. 87-177
2 박병석 등, 2005, 하부에 근접한 터널굴착에 따른 기존 병설터널의 안정성, 대한토목학회 2005년 정기학술대회 논문집, pp. 5596-5599
3 (사)한국지반공학회, 지반공학시리즈, 터널, 도서출판 구미서관
4 김도식 등, 2004, 비대칭 근접병설터널의 안정성 및 보강공법 검토, 터널 시공 기술향상 대토론회 4회 논문집, 대한토목학회, pp.179-197
5 서울특별시도시철도공사, 2001, 도시철도인접굴착공사 관 리실무
6 김동갑, 2005, 아주대학교 박사학위논문, "기존터널에 근접한 하부터널 굴착에 따른 교차부 지반의 거동"