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Study on the Seepage Forces Acting on the Tunnel Face with the Consideration of Tunnel Advance Rate  

남석우 (고려대학교 토목환경공학과)
이인모 (고려대학교 토목환경공학과)
Publication Information
Journal of the Korean Geotechnical Society / v.18, no.5, 2002 , pp. 221-228 More about this Journal
Abstract
The stability of a tunnel face is one of the most important factors in tunnel excavation. Especially, if a tunnel is located under groundwater level, groundwater may flow into the tunnel face and seepage forces acting on the tunnel face due to groundwater flow may affect seriously the stability of the tunnel face. Therefore, the seepage pressure at the tunnel face should be considered fir the proper design and safe construction of a tunnel. In this paper, the effect of tunnel advance rate on the seepage forces acting on the tunnel face was studied. The finite element program to analyze the groundwater flow around a tunnel with the consideration of tunnel advance rate was developed. Using the program, the parametric study for the effect of the tunnel advance rate and hydraulic characteristics of the ground on the seepage forces acting on the tunnel face was made. From this study, it was concluded that the tunnel advance rate must betaken into consideration as an additional parameter to assess the seepage forces at the tunnel face and a rational design methodology fer the assessment of support pressures required for maintaining the stability of the tunnel face was suggested for undetwater tunnels.
Keywords
Face stability; Seepage force; Tunnel advance rate;
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