Investigation of Internal Forces on a Suspension Submerged Floating Tunnel under Irregular Waves

This study investigates the dynamic behavior of a suspension-type submerged floating tunnel (SFT) under irregular waves using OrcaFlex simulation. Key design parameters(main cable arch height, arrangement angle, submergence depth, and unit weight) were analyzed.</br>The results demonstrate that an arch height of 80 m is optimal for stability, whereas an excessive height (150 m) significantly increases displacement and internal forces. Increasing the arrangement angle to 30° effectively mitigates sway motion, and deep submergence (100 m) drastically reduces wave-induced acceleration. While heavier cables suppress vibration, they induce higher static loads, indicating a trade-off relationship. Consequently, this study proposes an optimized configuration (80 m arch height, 30° angle, and deep submergence) to ensure structural safety and serviceability in deep-sea environments.