沉管隧道曲线段管节水力压接GINA不均匀压缩分析

Analysis of GINA uneven compression during hydraulic connection of immersed tunnel element at curved plane design line

港珠澳大桥沉管隧道部分管节位于路线设计的平曲线上,管节结构在平面上设计成近似曲线的形状。曲线段管节对接部位的GINA是均匀材质,由于管节结构不对称,水力压接作业时管节受力不均匀,最终导致GINA压缩不均。为确保工程线形可控,在曲线段管节设计中必须分析和解决该问题。文章通过力学分析计算GINA的压缩量,深化了对曲线段管节水力压接时GINA压缩问题的认识,可供类似工程参考。

Part of the immersed tunnel in Hongkong-Zhuhai-Macao Bridge project rests at a curve plane design line, and consequently tunnel elements are designed to a curved shape structure in plane projection. GINA at the joint part of tunnel element on curve section is homogeneous, due to the asymmetry of tunnel element, the stress of tunnel element is not uniform during hydraulic pressure operation, which leads to uneven compression of GINA. To ensure that the project line is manageable,the problem must be evaluated and solved during the design development of curved section tunnel element. We used mechanical analysis to calculate the GINA compression value, calculation results deepens the understanding of problem of GINA compression of curved element, which can be made reference to similar projects.