悬浮隧道施工过程结构特征参数与设计关键参数研究

Structural characteristic parameters and design key parameters during construction of submerged floating tunnel

悬浮隧道施工过程结构力学特征研究仍是空白。悬浮隧道施工时结构特点是一端约束、一端“自由”,管体长度随施工逐渐加长。完工后,隧道长度不再变化,隧道管体两端与岸边的连接方式有铰接、固结,或介于两者间。文章提出用于指导设计的悬浮隧道结构体系参数?,该参数代表管体与接岸接头对结构体系刚度的贡献与锚固系统的比值。并研究?在不同取值时悬浮隧道结构特征参数在施工过程与完工后比值与规律,结构特征参数包括结构主振周期、均布荷载作用下管体挠度与内力及管体与接岸接头铰接和固结的两种连接方式。详述了?的使用对设计与分析工作的指导作用。

The study on the structural characteristic parameters of submerged floating tunnel(SFT)during its construction stages is missing.At those stages,the tube of SFT is usually constrained on one end while"freed"on the other;the length of tube increases until construction completes.Afterwards,tube length is fixed and its two ends connected to shore;the shore connection can either be pinned or fixed or in-between.We proposed a single index?for SFT structural system,as the ratio of stiffness contribution of the tube connecting to shore connection and that of mooring system.With the change of?,the ratio and law of SFT structural characteristic parameters at every construction steps and at completes/operational period were studied,the said parameters include the main vibration period of the SFT structural system,the deflection and internal force of SFT tube subjecting to uniform loading,and the articulation and consolidation of the pipe body and the shore joint.The guiding function of the use of?to the SFT design and analysis work is described in detail.