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The immersed tunnel project crossing over the Bosphorus Strait located in Istanbul, Turkey, is under construction. The immersion procedure was carefully examined by mans of a physical model test, because the current field of the Bosphorus Strait is complicated and has two-layer system consisting of surface southwards flow and bottom northwards flow. The objectives of the model test are: to measure the mooring forces for all immersion processes, to check behavior of a placing barge and a tunnel element during immersion process, and to confirm immersion procedure using winch work. A seventeen mooring wires are used for completing the immersion of a tunnel element, and the mooring forces of all wires in each immersion process were measured. Based on the average/maximum forces of wires through the all model tests, the designed winch capability was determined.

HYDRAULIC PHYSICAL MODEL TEST FOR THE TUNNEL IMMERSION OF RAILWAY BOSPHORUS TUBE CROSSING