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  Long-Term Experimental Assessment of the Water-Tightness of Gasket with Hydrophilic Sealant under High Water Pressure

  Tunnel construction with segmental linings (shield tunnels) under extremely high water pressure, such as those at a great depth or underneath the seabed or both, has been increasing. In those tunnels, significant water infiltration at the joints of segmental linings could be a serious problem and lead to a catastrophic event. Water-tightness at segmental joints is also important to ensure the durability of such tunnels. In Japan, gaskets with hydrophilic sealant are commonly used to prevent water infiltration at segmental joints. However, before 1999, few studies of the long-term effect on such gaskets were conducted. This paper elaborates on experimental tests including a water-leakage test over 17 years to assess the long-term effect on the water-tightness of gaskets with hydrophilic sealant under high water pressure.

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