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Naha immersed tunnel will cross under the port entrance of the Naha wharf, Okinawa, where large liner ships are in service. Fluid power caused by the large vessel was expected to influence strongly against the stability of the tunnel element during construction. In this report, the stability of the element is investigated through threedimensional numerical simulation, in which speed of the large vessel is assumed to be constant. It is confirmed from the simulation that a large up-lift force is generated by the large vessel when it passes above the element, and that increase of navigation speed reduces the stability of the element against sliding.

ON THE STABILITY OF IMMERSED TUNNEL ELEMENT FOR THE NAVIGATION OF LARGE VESSEL