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  Evaluation of the Compressible Gasket Design and Performance for Steel Segments of Bored Tunnels

  This paper discusses a very unique research including the design and testing of the compressible type gaskets for steel segments, which has not been studied much in the field of the TBM tunneling. Over the course of developing the design of segments of steel rings or flexible rings of the bored tunnels for Eurasia Tunnel, it was discovered that gaskets do not have sufficient space to expand upon compression during the assembly of the segments if the original concrete segment groove design is followed. It was also discovered that the gasket profile adapted in the corners of the segments have a critical role in the water tightness performance. This research covers an evaluation on how different assembly methods for steel rings impact the performance of the gaskets through testing and with specific examples from Eurasia Tunnel in Istanbul, Turkey.

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