천층터널 주변의 흐름거동 및 수치 해석적 모델링기법 연구
A study on the flow behavior around shallow tunnels and its numerical modelling
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초록
Design and construction of tunnels require understanding the influence of groundwater. Particularly, it is essential to know how the drainage conditions at the tunnel boundary affect flow behavior of ground adjacent to the tunnels. In this study flow behavior of a leaking tunnel was investigated using physical model tests for tunnel depths and various hydraulic boundary conditions. Particular concerns were given to flow lines toward tunnels. Test results showed that the boundary conditions hardly influence on flow patterns and time required to reach steady state conditions. It is revealed that with an increase in water depth, flow lines concentrated to the drain holes. The physical tests were numerically simulated. Numerical results showed that the flow behavior was represented appropriately by considering filter-drain hole drainage rather than boundary drainage all over the lining.
Abstract
Design and construction of tunnels require understanding the influence of groundwater. Particularly, it is essential to know how the drainage conditions at the tunnel boundary affect flow behavior of ground adjacent to the tunnels. In this study flow behavior of a leaking tunnel was investigated using physical model tests for tunnel depths and various hydraulic boundary conditions. Particular concerns were given to flow lines toward tunnels. Test results showed that the boundary conditions hardly influence on flow patterns and time required to reach steady state conditions. It is revealed that with an increase in water depth, flow lines concentrated to the drain holes. The physical tests were numerically simulated. Numerical results showed that the flow behavior was represented appropriately by considering filter-drain hole drainage rather than boundary drainage all over the lining.
참고문헌 (7)
- Atkinson, J.H., "Loads on leaking and watertight tunnel lining, sewers and buried pipes due to groundwater", Geotechnique, 33(3), pp.341~344 (1983)
- Fernandez, G, "Behavior of pressure tunnels and guidelines for liner design", Journal of Geotechnical Engineering, 12(12), pp.1768~1791 (1994)
- Fernandez, G, "Seepage-indeced effective stresses and water pressures around pressure tunnels", Journal of Geotechnical Engineering, 120, pp.108~128 (1992), Vol.120
- Harr, M.E, "Goundwater and Seepage" (1962), McGraw-Hill
- Jong-ho Shin, "Numerical analysis of tunnelling in decomposed granite soil", Ph.D., pp.2002
- Shin, J.H, "A numerical study of the effect of groundwater movement on long-term tunnel behaviour", Geotechnique, 52(6), pp.391~403 (2002)
- Shin,Y.J, "Elasto-plastic ground response of underwater tunnels considering seepage forces", Ph.D., pp.2007