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A platform for research: civil engineering, architecture and urbanism
Hydraulic Response on Shield Tunnel Face Subjected to Water Level Fluctuation
Abstract Subaqueous shield tunnels in offshore or coast conditions are constructed in a complex environment. The tunnel face stability is highly affected by tides and waves. The pore water pressure response near the tunnel excavation face is very important during the construction of the tunnel. Based on the Qingchun Road Tunnel in Hangzhou, a three-dimensional numerical model was established and the pore water response on tunnel surface to tide impact is studied. It is shown that the water level fluctuation is easier to propagate in silty soil with the increase of the soil permeability or the decrease of the soil compressibility. The seepage force on the tunnel face varies with time and the maximum value is smaller than that calculated in static water condition with the highest tidal level. The characteristics of the total head, pressure head and hydraulic gradient at different locations near the tunnel face are investigated. The phenomenon of phase lag is more obvious as the depths increase. It is also found that the phase difference on the same horizontal plane is almost equal.
Hydraulic Response on Shield Tunnel Face Subjected to Water Level Fluctuation
Abstract Subaqueous shield tunnels in offshore or coast conditions are constructed in a complex environment. The tunnel face stability is highly affected by tides and waves. The pore water pressure response near the tunnel excavation face is very important during the construction of the tunnel. Based on the Qingchun Road Tunnel in Hangzhou, a three-dimensional numerical model was established and the pore water response on tunnel surface to tide impact is studied. It is shown that the water level fluctuation is easier to propagate in silty soil with the increase of the soil permeability or the decrease of the soil compressibility. The seepage force on the tunnel face varies with time and the maximum value is smaller than that calculated in static water condition with the highest tidal level. The characteristics of the total head, pressure head and hydraulic gradient at different locations near the tunnel face are investigated. The phenomenon of phase lag is more obvious as the depths increase. It is also found that the phase difference on the same horizontal plane is almost equal.
Hydraulic Response on Shield Tunnel Face Subjected to Water Level Fluctuation
Ying, Hongwei (author) / Wei, Hua (author) / Zhang, Jinhong (author) / Zhu, Chengwei (author)
2018-01-01
5 pages
Article/Chapter (Book)
Electronic Resource
English
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