Analytical Study on Seepage Field of Three-hole Parallel Subsea Tunnel in Soil of Finite Depth
Research purposes:At present,the research on the seepage field of subsea tunnels is mostly based on the single-hole tunnel in semi-infinite space.Considering that the actual project often uses the three-hole parallel layout method and that there are often impermeable boundaries such as a relatively impermeable layer or bedrock under the tunnel in the actual project,this paper uses the image method and the shaft theory to derive the analytical solution of the seepage field of the subsea tunnel in soil of finite depth based on the seepage mechanics,and the formula is degenerated and verified numerically.The impermeable boundary distance,buried depth,spacing,and grouting parameters of the three-hole tunnel are analyzed.Research conclusions:(1)The impermeable boundary under the tunnel has a great impact on the water inflow.When the impermeable boundary is 25 r 1 from the tunnel center,it has no impact on the water inflow.(2)The seepage field between three parallel tunnels affects each other,and the influence gradually weakens with the increase of tunnel spacing.When the tunnel spacing is greater than 30 r 1,the water inflow basically has no effect.(3)The water inflow of three-hole parallel tunnel decreases first and then increases with the increase of buried depth,and the water inflow is the smallest when the buried depth is 2 r 1.(4)The water inflow of the three-hole parallel tunnel decreases with the increase of the thickness of the grouting and the decrease of the permeability coefficient.In practical engineering,the grouting compactness and grouting thickness should be equally important.(5)The results of this study can provide reference and guidance for the design and construction of relevant subsea tunnel projects.
subsea tunnelthree-hole parallelsoil of finite depthanalytical solution of seepage fieldwater inflow
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