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接头是沉管隧道中很薄弱但是非常关键的环节,接头的防水则更是被重点关注的内容。管段的不均匀沉降会导致接头的错位和张开,给接头的安全止水带来很大威胁。采用三维数值模拟方法,考虑接头GINA止水带和管端混凝土的非线性接触,以历年监测数据所反映的沉管位移作为边界条件,分析了沉管隧道接头GINA止水带在接头处于压缩、剪切和扭转等变形及复合状态下的力学性态,得到了接触应力在接头断面上的分布规律。结果表明,GI-NA止水带渗水接触应力的控制点通常位于GINA止水带截面下缘;接触应力在顶板、底板和侧壁分部较均匀,在转角部位易集中;在现有沉降水平下,接头GINA止水带的安全止水性能是可靠的。
Connector is a very weak but very critical part of immersed tunnel, waterproof joints is even more the focus of attention. Uneven settlement of the pipe will lead to dislocation joints and open, to the joint safety of water cut a great threat. The three-dimensional numerical simulation method is used to consider the nonlinear contact between the GINA water-stop and the concrete at the joint. Based on the displacement of the immersed pipe reflected by the monitoring data in the past years, the GINA water- Shear and torsion deformation and composite state of the mechanical properties, contact stress distribution obtained in the joint section. The results show that the control points of GI-NA waterstop water seepage contact stress are usually located at the lower edge of the GINA waterstop section. The contact stress is uniform in the roof, floor and sidewall, and is easy to concentrate on the corner. At the existing settlement level , The safe water stop of the GINA water stop is reliable.