Abstract
According to the characteristics of water flow movement in the junction area of island and tunnel, the “asymmetric” type double diversion dike measures for the north and south sides of basement shelter area were formulated. The 3D mathematical model of flow in the water area of local sinking base was established in this article. The hydrodynamic simulation of the diversion dike was carried out. The results showed that the flow velocity in shelter area of basement is greatly reduced. The maximum flow velocity of artificial flattening section of E33 pipe joint base is less than 0.5 m/s, and the maximum flow velocity of flattening ship construction section is not more than 0.8 m/s. The flow rate can meet the conditions of immersed tube installation. For safety reasons, E33 pipe joint placement time is suitable for the small tide period with weaker power flow.
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