中文摘要：

沉管隧道接头结构复杂,相对于预制管段,管段接头是沉管隧道的薄弱环节。管段的不均匀沉降会导致接头处的张开与错动,引起GINA止水带的变形,造成接头防水能力的降低甚至丧失,从而对隧道的安全运营造成极大的危害。采用有限单元法针对沉管接头GINA止水带进行建模,对多工况下GINA止水带的受力变形机制进行系统化研究,以期对沉管隧道接头的防水设计和施工提供参考。主要结论如下：1）运营工况下,GINA的压缩量不宜小于90 mm,接头张开量不宜大于35 mm;2）设计条件下管节相对水平错动20 mm,相对竖向错动35 mm时,不会影响GINA止水带功能;3）运营工况下,GINA止水带两肩部的差异变形对其止水功能影响较小。

英文摘要：

The joint structure of immersed tunnel is very complex; it is the weakness of immersed tunnel. The uneven settlement of the prefabricated segment would lead to the open and dislocation of segment joint, and would further affect the GINA water seal strip. The reducing and loose of the waterproofing capability of segment joint would lead to safety risk of tunnel running. The GINA water seal strip used in immersed tunnel is modeled by finite element method; and then the deformation mechanism of the GINA water seal strip under different construction conditions is studied. Some conclusions are drawn as follows ： 1 ） The compression amount of GINA water seal strip should not be less than 90 mm and the opening amount of the segment joint structure should be less than 35 mm under operating condition. 2） The sealing function of the GINA water seal strip will not be affected under the conditions of the tangential dislocation of the joint structure less than 20 mm in horizontal direction and 35 mm in vertical direction. 3 ） The difference deformations of GINA water seal strip shoulders affect its sealing function little.