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  Implementation of Seismic Joints in Istanbul Strait Road Tube Crossing Project

  Seismic Joints are defined as, steel-rubber composite flexible rings that allow in and out of plane movement resulting from seismic events. Although implementation of Seismic Joints as flexible rings of bored tunnels is quite rare, globally there have been several successful applications in Japan. This paper discusses the implementation steps of two unique Seismic Joints of bored tunnel of Istanbul Strait Road Tube Crossing Project (Eurasia Tunnel) from developing the design and specifications, laboratory performance testing till the assembly inside the tunnel under quite challenging site conditions including high water pressures up to 11 bar, large tunnel diameter of 13.2 OD, tight assembly tolerances and 100 years of life time requirements. The case study of Eurasia Tunnel is presented.

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