为研究冲击荷载作用下悬浮隧道锚索的松弛现象及结构动力响应，采用ABAQUS软件建立悬浮隧道整体有限元模型，通过刚度的变化来模拟锚索的松弛状态，由UAMP子程序接口计算与管体振动速度对应的流体阻力幅值，得到考虑锚索松弛的悬浮隧道冲击动力响应，并分析冲击荷载、浮重比、锚索倾角等因素对动力响应的影响。结果表明： 1）在冲击荷载作用下，悬浮隧道锚索会发生松弛现象，使结构整体动力响应增大； 2）锚索在松弛—张紧过程中会产生冲击张力； 3）增大冲击荷载和增加冲击荷载时间会使锚索松弛范围增大，索力的恢复时间增长，冲击张力增大； 4）增大管体浮重比有利于减少锚索松弛现象，浮重比建议取值为1.4左右； 5）考虑到松弛效应、初始索力和锚索布置等因素，锚索倾角建议取值为45°~60°。

The overall finite element model of a submerged floating tunnel(SFT) is established using ABAQUS software, and the slacking state of the cable is simulated by changing its stiffness to explore the slackage of the SFT cable and the structural dynamic response under impact load. Subsequently, the hydraulic resistance amplitude corresponding to the vibration velocity of the tube is calculated by the UAMP subroutine, obtaining the impact dynamic response of SFT considering the slackage of the cable. Finally, the effect of impact load, buoyancyweight ratio, and cable inclination on the dynamic response is analyzed. The results reveal the following: (1) Under the impact load, the SFT cable will experience slackage, increasing the structure′s overall dynamic response. (2) During the slackagetension process, impact tension is generated. (3) Increasing the magnitude and duration of the impact load will increase the slackage range, the recovery time, and the impact tension of the SFT cable. (4) Increasing the tube′s buoyancyweight ratio is beneficial to reduce the slackage of the cable, and the recommended buoyancyweight value is 1.4. (5) Considering the slackage effect, initial force, and SFT cable arrangement, the recommended cable inclination angle value is between 45° and 60°.