An experimental investigation on the coupled dynamics of an offshore tunnel-rig system from the element launching to its near-seabed immersion in irregular waves is conducted, where the motions of tunnel/rigs and the tensile forces of the suspension lines are evaluated in a synchronous manner for a wide range of irregular waves. The effect of immersion depth on the coupled dynamics of the tunnel-rigs system, especially the relationship between the relative motion and suspension line tensions are experimentally examined. The system coupling mechanism is further addressed using the modal analysis and response spectra analysis. The results show that the natural frequencies of the coupled system are primarily affected by the varying immersion depth. The increasing immersion depth leads to a larger in-phase roll period of the system and a greater roll resonance amplitude. For a given immersion depth, a strong dependence of the suspension line tensions upon the relative motions is established.

对海上隧道钻机系统从元件下水到近海床浸入不规则波浪的耦合动力学进行了实验研究，其中隧道/钻机的运动和悬索的拉力被同步评估适用于范围广泛的不规则波浪。浸入深度对隧道钻机系统耦合动力学的影响，特别是相对运动和悬挂线张力之间的关系进行了实验研究。使用模态分析和响应谱分析进一步解决系统耦合机制。结果表明耦合系统的固有频率主要受浸入深度变化的影响。浸入深度的增加导致系统的同相滚动周期和滚动共振幅度更大。对于给定的浸入深度，悬挂线张力对相对运动的依赖性很强。