水中悬浮隧道受撞击作用的数值分析

Numerical analysis of impact of submerged floating tunnel

针对水中悬浮隧道在偶然状况下受到的潜艇撞击问题,文章采用流固耦合方法,建立了撞击作用下浮筒式悬浮隧道的有限元动态模型,分别撞击跨中、隧道四分之一跨、浮筒,分析隧道变形、撞击力、连接钢管拉杆力、隧道端部约束力、隧道动能情况。结果表明:撞击作用下,隧道整体变形明显,结构内力大。不同撞击位置处,悬浮隧道在水下的结构变形和受力行为区别明显。对此,有必要考虑撞击位置进行悬浮隧道的抗撞击设计。

In response to the submarine impact problem of submerged floating tunnel(SFT),a finite element dynamic model was established by using fluid-solid coupling method.The impact of tunnel deformation,impact force,connecting pipe force,tunnel constraint force and tunnel kinetic energy were analyzed by hitting the mid-span,one-quarter span of the tunnel and float respectively.The results show that the overall deformation of the tunnel is obvious,and the internal force of the structure is large under the impact.Under different impact conditions,the structural deformation and force behavior of the SFT are distinct.Therefore,it is necessary to consider the impact location for the anti-impact design of SFT.